Two Types of Dark Matter and
Their Effects on Dark Matter Detection on Earth

Web Page (3)
Original on August 29, 2016
Updated on
April 25, 2018

By Sing H. Lin, Ph.D., E-Mail: singhlin@gmail.com
1. Two Types of Dark Matter

There are at least two different types of dark matter:

Type A low density dark matter is in the galaxy dark matter halo surrounding our Milky Way Galaxy or other
galaxies. It is expected that most dark matters are Type A low density dark matter.

But a fraction of dark matters are Type B dark matter that can clump together into much higher density
because Type B can shed more energy through certain dissipative processes involving dark radiation or dark
force or dark light, or fifth fundamental force or dark photon or other yet unknown processes in the dark
sector of universe.
Professor Lisa Randall of Harvard University, Professor Sean Carroll at the California
Institute of Technology, and several other scientists have already explored and proposed dark radiation, dark
light, dark force, dark photon, and fifth fundamental force in the dark sector of the universe. CERN (the
European Organization for Nuclear Research) now has a new
NA64 project to run a new experiment to try to
detect dark photons. This is part of the great mysteries of the dark sector of the universe that require more
research and experiments in the future.

2. Twelve or More Deep Underground Laboratories Trying to Detect Type A Dark Matter

Twelve or more deep underground laboratories have been set up and running for many years to try to detect
Type A dark matter. However, ten or more deep underground laboratories keep on coming up empty handed.

But the experiment known as, DAMA/LIBRA collaboration, in the deep underground laboratory under the Gran
Sasso mountain in Italy claims that they have been detecting consistently for 20 years Type A dark matter
with an important signature of annual modulation (seasonal variation) in the detected signal.

Another experiment, known as CoGeNT, in the deep underground laboratory in Soudan, Minnesota, USA has
also detected similar signal with a similar signature of annual modulation. But the CoGeNT team in Minnesota
is not sure if it is dark matter because of multiple detections in multiple detectors in the deep underground
laboratory in Minnesota. The CoGeNT team in Minnesota knows that Type A dark matter cannot produce
multiple detections in multiple detectors.

It has been a serious dilemma in science community for many years because the claimed detection of Type A
dark matter in Italy is NOT repeatable in ten or more other deep underground laboratories in other parts of
the world. Many scientists question the validity of the claim that Type A dark matter from galaxy dark matter
halo has been detected in Italy.

Furthermore, in a
paper posted April 4, 2018 to the physics preprint site, arxiv.org, three physicists,
Professor Katherine Freese, Sebastian Baum and Chris Kelso,
showed that a standard dark-matter WIMP
cannot produce the  new (Phase 2) DAMA signal, the newer and better DAMA data in Phase 2 in recent
additional six years of data after the DAMA experiment system was upgraded to increase its sensitivity to
lower energy level. The discrepancy between predictions in this paper and the Phase 2 DAMA data further
strengthen the serious doubt in the science community on the validity of the claim that dark matters from
galaxy dark matter halo have been detected in Italy. In other words, nobody understands DAMA data.

3. What Have We Learned From These Deep Underground Experiments?

3.1. Type A Dark Matter and Assumption of WIMP Model

In the designs and the constructions of those twelve or more deep underground laboratories, most scientists
are thinking about the Type A dark matter in galaxy dark matter halo with the popular assumption of WIMP
(Weakly Interacting Massive Particle) as a favored candidate for Type A dark matter. The assumed WIMP
model for galaxy dark matter halo implies that the distribution of Type A dark matter in the earth is uniform
and that all these twelve or more deep underground laboratories should all have detected lots of WIMPs in a
few years of experiments.

3.2. Why Ten or More Deep Underground Laboratories Keep On Coming Up Empty Handed?

But the consistent null result from ten or more deep underground laboratories/experiments at many different
locations provide us an important hint that the popular assumption of WIMP as a candidate for Type A dark
matter may be wrong. The news articles on such possible fate of WIMP assumption can be seen
here and
here.  The actual Type A dark matter particles may be super-heavy particle that is much heavier than WIMP
by many orders of magnitude as proposed recently (2016) by
Dr. McCullen Sandora and his colleagues in
Denmark. The super-heavy dark matter particles are also known as WIMPZilla dark matter or GUTzilla Dark
Matter.

If dark matter particle is heavier than WIMP by many orders of magnitude, then the required density of super-
heavy dark matter particles in galaxy dark matter halo to keep our Milky Way Galaxy from flying apart is
lower than that of assumed WIMP model by many orders of magnitude. Therefore, the probability of
detecting super-heavy Type A dark matter is lower than that of WIMP model by many orders of magnitude.
This means that it may take thousands of years or even longer to be able to detect reasonable number of
collisions with super-heavy Type A dark matter particles in these deep underground laboratories. This may be
the reason that ten or more deep underground laboratories keep on coming up empty handed with experiment
period of only a few years or less.

4. Why Two Deep Underground Laboratories Claim Dark Matters Have Been Detected?

But the DAMA/LIBRA collaboration under Gran Sasso mountain in Italy claims that they have detected Type
A dark matter from galaxy dark matter halo because of the measured signature of the annual modulation in
the detected signal.

4.1. Type B vs Type A Dark Matter in These Deep Underground Laboratories

With my more than 20-year research on Type B high density dark matter associated with Gravity Hills and
Mystery Spots on earth, I have been focusing on Type B high density dark matter at these special locations
of Gravity Hills and Mystery Spots. With my background and experience very different from those of many
other scientists working on dark matter research, I am bringing in an out-of-box thinking and believe that what
the laboratory in Italy has detected are Type B high density dark matter trapped and oscillating in earth
gravity well instead of Type A low density dark matter in galaxy dark matter halo.

4.2. High Concentration of Type B Dark Matter at Special Locations

The distribution of Type B dark matter on earth is NOT uniform, but is highly concentrated at special locations
known as Gravity Hills or Mystery Spots on earth. The density of Type B dark matter at these special
locations is so high as to create very strong abnormal local gravity that manifests as various kinds of gravity
mysteries that have been observed by many people at these special locations on earth for more than 100
years.

My more than 20-year research on Gravity Hills and Mystery Spots indicates that the source of the significant
abnormal local gravity at each of those strange locations on earth is a fountain of very high density Type B
dark matter with a mass density at least 1,000 times greater than that of average ordinary matter on or near
earth surface. Each fountain of Type B dark matter is supported by two vertical narrow streams of very high
density Type B dark matter trapped and oscillating in earth gravity well. Details of my more than 20-year
research on Gravity Hills and Mystery Spots as related to very high density Type B dark matter are described
on my two web pages at:

Web Page (2):
http://www.shltrip.com/Oregon-Vortex.html

and

Web Page (1):
http://www.shltrip.com/Magnetic_Hill.html

4.3. First Effect of High Concentration on Dark Matter Detection on Earth

The existence of these special gravity mysteries at these special locations of Gravity Hills and Mystery Spots
on earth indicates that the distribution of Type B dark matter on earth is NOT uniform, but is highly
concentrated at these special locations of Gravity Hills and Mystery Spots. Therefore, we cannot expect all
these deep underground laboratories at various locations of the world to have the same probability of
detecting Type B dark matter. It all depends on whether the dark matter detector in the laboratory intercepts
one of such narrow stream of extreme high density Type B dark matter particles or not.

4.4. Second Effect of High Concentration on Dark Matter Detection on Earth

The density of Type B dark matter in the core of the fountain or in the narrow streams is much higher than
that of Type A in galaxy dark matter halo by many orders of magnitude such that the deep underground
laboratory in Italy is able to detect Type B dark matter in reasonable amount of time if the detector is lucky to
be at the right locations to intercept the narrow stream of extreme high density Type B dark matter.

4.5. My Model for Signature of Annual Modulation in Detected Signal

In my theory, the reason for the signature of annual modulation in the detected signal is due to the seasonal
variation of the distance between the sun and the earth as described in Appendix D.2.2 on my Web Page (2).
Such seasonal variation of the gravity from sun causes seasonal slight variation of the location of the narrow
stream of the high density dark matter oscillating in the earth gravity well leading to the seasonal variation
(Annual Modulation) in the detected signal.

My model for annual modulation in detected signal is very different from the Dark Matter "Wind" Model used
by DAMA/LIBRA collaboration team.  In the Dark Matter "Wind: model, the detected annual modulation is
assumed to be due to the seasonal variation in dark matter "wind" in galaxy dark matter halo as seen by the
dark matter detectors on earth while the earth orbits around the sun and the entire solar system orbits around
the center of Milky Way Galaxy.

The
paper posted April 4, 2018 to the physics preprint site, arxiv.org, by the three physicists, Professor
Katherine Freese, Sebastian Baum and Chris Kelso,
showed that a standard dark-matter WIMP in galaxy
dark matter halo cannot produce the new (Phase 2) measured DAMA signal, i.e., the newer and better
DAMA data in Phase 2 in recent additional six years after the DAMA experiment system was upgraded to
increase its sensitivity to lower energy level. In other words, the DAMA data is NOT consistent with the
theoretically predicted behavior based on the Dark Matter "Wind" Model. This paper implies that the observed
annual modulation in the detected DAMA signal is NOT due to the seasonal variation in dark matter "wind" in
galaxy dark matter halo as seen by a dark matter detector on the earth orbiting the sun while the entire solar
system orbits the center of Milky Way Galaxy, but is due to some other mechanism. A possible other
mechanism for such observed annual modulation is my model described in the first paragraph in this Section
4.5.

4.6. Why Deep Underground Laboratory in Minnesota Has Also Detected Type B Dark Matter

Furthermore, I believe what the deep underground laboratory in Soudan, Minnesota, USA has detected are
also Type B high density dark matter for the follow reasons:

4.6.1. High Density and Detection of Dark Matter Particles in Multiple Detectors

The data from deep underground laboratory in Minnesota indicate detection of dark matter particles in
multiple detectors. This experimental finding provides an important hint that the density of dark matter
particles in the stream of dark matter particles being detected is extremely high which is a signature of high
density Type B dark matter. It is a clear indication that what has been detected is NOT Type A low density
dark matter because low density Type A dark matter cannot be detected in multiple detectors.

On the other hand, my dark matter based theory derived from Gravity Hill Mystery and Shrink-and-Grow
Mystery predicts that the mass density of the core of the fountain of dark matter in the earth must be at least
1,000 times greater than that of ordinary matter on earth surface. Therefore, both experimental data from
deep underground laboratory in Minnesota and my dark matter based theory derived from Gravity Hill
Mystery and Shrink-and-Grow Mystery consistently indicate that the mass densities of dark matter particles
in the streams of dark matter particles at these special locations in the earth are extremely high.

4.6.2. Streaming of Detected Dark Matter Particles

The dark matter detection data from deep underground laboratory in Minnesota, USA agrees neatly with that
from deep underground laboratory in Italy if the detected dark matter particles are assumed to be streaming
in certain direction. Such streaming dark matter particles inferred from data from deep underground
laboratories agrees with streaming dark matter particles predicted from my dark matter based theory derived
from Gravity Hill Mystery and Shrink-and-Grow Mystery. In other words, what have been detected in DAMA
in Italy and in CoGeNT in Minnesota are not uniformly distributed low density dark matter in galaxy dark
matter halo but are very high density dark matter streaming in certain direction which consistent with my
results from my study of Gravity Hills and Mystery Spots on earth.

5. How To Verify Successful Detection of Type B Dark Matter in Italy and in Minnesota?

The remaining important question is whether those two deep underground laboratories in Italy and Minnesota
are so lucky to have their detectors intercepting the narrow streams of very high density Type B dark Matter.

This important question can be answered by simple tests for several important signatures of high density
Type B dark Matter as described in the following subsections.

5.1 First Signature of Extreme High Density Type B Dark Matter - Significant Abnormal Local Gravity

One of several important signatures of the narrow stream of extreme high density Type B dark matter is the
existence of significant abnormal local gravity near the narrow stream of extreme high density Type B dark
matter oscillating in earth gravity well. Therefore, my theory predicts existence of significant abnormal local
gravity near the detectors in those two deep underground laboratories in Italy and in Minnesota.

It is then important to test for the existence of significant abnormal local gravity near the detector locations in
those two deep underground laboratories in Italy and in Minnesota. Six methods for testing for existence of
significant abnormal local gravity are described in my two Web Pages (1) and (2) listed above.

In addition to the measurements of the significant abnormal local gravity near the vertical streams of very high
density Type B dark matter (i.e., near the dark matter detector) by various instruments, the human body can
also feel it. When people stands very close to the vertical stream of very high density Type B dark matter,
people can feel a very strong horizontal gravity pull towards the vertical streams of very high density Type B
dark matter. As people steps away by a few steps from the vertical streams, the horizontal gravity pull will
decrease substantially.

5.2. Shrink-and-Grow Mystery

The second important signature is that high density Type B dark matter shrinks the space by a few percent in
its vicinity as described in my Web Page (6):

Web Page (6): http://
www.shltrip.com/Space_Shrinking_Capability_of_Dark_Matter.html

The percentage shrinking of space decrease as the distance increase away from the narrow stream of high
density Type B dark matter. Such distance dependent of space shrinking can be tested by the Shrink-and-
Grow Mystery demonstration as described in my Web Page (6).

It is then important to test for the distance dependence of space shrinking in those two deep underground
laboratories in Italy and in Minnesota as one of the critical verification tests for the direct detection of Type B
high density dark matter in those two deep underground laboratories. Such distance dependence of space
shrinking manifests as the well known Shrink-and-Grow Mystery as described in my Web Page (6).

The test results from Sections 5.1 and 5.2 are also very important for us to understand dark energy as
related to dark matter as described in my Web Page (6) listed above.


5.3. Effect of High Density Dark Matter on Human Being and Other Animals

When standing near or inside the Mystery House which is a few feet from the center of the Mystery Spot
Area, many visitors feel seasick, or motion sickness or nausea or dizzy as described on Page 15 in
here.
Some other people hear ringing in their ears when they are in Mystery Spot Area.

Such effects on human being can be tested by having several people standing near the dark matter detector
in the deep underground laboratories in Italy or in Minnesota. If some of those people feel seasick, or motion
sickness or nausea or dizzy or hear ringing in their ears, the following on test is for those people to walk a
distance of hundreds of feet away from the dark matter detector to see if the ill feeling subsides or not. If the
tested results indicate ill feeling when people are near the dark matter detector and the ill feeling subsides
substantially when those people walk away from the dark matter detector, then it is a confirmation of the
effects of the high density Type B dark matter on human being near the dark matter detector in the deep
underground laboratories in Italy or in Minnesota.

5.4. Strange Failures or Malfunction of Some Digital Electronic Devices

Another signature of the high density Type B dark matter is the strange failures or malfunction of some (but
not all) digital electronic devices when they are in a Mystery Spot Area as described in Section 8.3. But these
digital devices work well and normally when they are moved out and away from the Mystery Spot area.
Therefore, this is another signature to test for the existence of high density Type B dark matter near the dark
matter detector in the deep underground laboratories in Italy or in Minnesota.

If the measured results confirm existence of these signatures described in Sections 5.1 to 5.4, they are
strong confirmation and verification for successful direct detection of Type B high density dark matter in those
two deep underground laboratories in Italy and in Minnesota.

The validated successful direct detection of Type B high density dark matter by human being for the first time
will be a major milestone and accomplishment in modern science.

6. How can Fountain of Type B high density dark matter stays steadily at the special location of a Gravity Hill
or a Mystery Spot?

During my presentation on September 29, 2016 in Monmouth County Library, one important question raised
by the audience is "How can fountain of Type B high density dark matter stays steadily at the location of a
Gravity Hill or a Mystery Spot knowing that dark matter rarely interact directly with ordinary matter?" The
answer to this important question is that it is not a solid and rigid fountain of high density dark matter. Instead,
the fountain of dark matter is the tip of a very long and narrow stream of Type B high density dark matter that
is trapped in earth gravity well and is oscillating in earth gravity well. More details are explained in Section 5
of Web Page (2) listed above.

7. Next Phase of More Advanced Dark Matter Experiments

Based on my theory, we know the locations of very high density Type B dark matter on earth at:

Hundreds of known Gravity Hills,
Several known Mystery Spots, and
Those two deep underground laboratories in Italy and in Minnesota

The next phase of more advanced dark matter experiments should be done at these special locations of
extreme high concentration of Type B dark matter, so that we have better chance to find out what Type B
dark matter is.

These special locations may be also important to investigate various unfamiliar processes, such as dark
radiation, dark force, dark light, fifth fundamental force, dark photon or other yet unknown processes
associated with Type B dark matter in the dark sector of universe.

On the other hand, there are some proposals to use the sodium iodide detectors, similar to that used in
DAMA in Italy laboratory, in other locations to test the validity of claimed dark matter detection in Italy. From
my viewpoint, this is a wrong test. The critical factor is to be at the right LOCATION of extreme high density
Type B dark matter, not the detector material, for successful detection and investigation of Type B dark
matter.

8. More on Two Types of Dark Matter and Dark Interaction Processes in Dark Sector of Universe

8.1. Existence of Type B High Density Dark Matter on Earth

Although we cannot see dark matter directly, several problems and mysteries in several different astronomy
observations all point to the existence of Type A low density dark matter in galaxy dark matter halo which has
been attracting the attention of most scientists working on dark matter research.

In addition to the low density dark matter, several pioneer scientists have also explored and proposed dark
radiation, dark force, dark light, fifth fundamental force, dark photon or other yet unfamiliar processes in the
dark sector of universe. These unfamiliar processes in the dark sector of the universe are important for the
existence of Type B high density dark matter.

On the other hand, My more than 20-year research on gravity mysteries at Gravity Hills and in Mystery Spots
on earth indicates that very high concentration of Type B dark matter exist at many special locations of
Gravity Hills and Mystery Spots on earth.

8.2. Preliminary Experimental Findings of Previously Unknown Force Carrier Boson

The results of two recent experiments provide preliminary hints of existence of previously unknown force
carrier boson that may interact with dark matter and of previously unknown interactive processes in the dark
sector of universe:

8.2.1. Hungarian Experiment

The recent (2015) experiments by Professor Attila Krasznahorkay and his colleagues at the Hungarian
Academy of Sciences’s Institute for Nuclear Research in Debrecen, Hungary provide a preliminary hint of
experimental findings of dark photon or new force carrier boson. A follow up analysis of the Hungarian
experimental results by
Professor Jonathan Feng and his colleagues at the University of California, Irvine
indicates that this could be the signature of a previously unknown fifth fundamental force of nature.

8.2.2. Large Hadron Collider (LHC) Experiment

Professor Bruce Mellado, the leader and his team of 35 scientists of High Energy Physics Group (HEP) at
University of the Witwatersrand from South Africa have been working on the experiments at the Large Hadron
Collider (LHC) at the European Organisation for Nuclear Research (CERN), on the French-Swiss border.
Based on a number of features and peculiarities of the data reported by the experiments at the LHC and
collected up to the end of 2012, the Wits HEP group in collaboration with scientists in India and Sweden
formulated the Madala hypothesis. This hypothesis describes an entirely new boson, named as the Madala
boson, that interacts with dark matter. When the experiment at the LHC was repeated in 2015 and 2016, the
team found the findings lined up with those which had triggered their hypothesis.

CERN now has a new
NA64 project to run a new experiment to try to detect dark photons.


8.3. Failures of Some Digital Electronic Devices in Mystery Spot Areas and Dark Interaction Processes

Many visitors (including me) have reported their strange experience of failures or malfunction of some (but not
all) of their digital electronic devices when they are in a Mystery Spot area. These digital electronic devices
work perfectly when they are outside of the area of the Mystery Spot, but do not work properly when they
are inside the Mystery Spot area.

8.3.1. Failure of Digital Body Weight Scale

For example, in my second visit of the Mystery Spot in Santa Cruz, California in 2012, my younger son, living
in Mountain View, California, responded to my request, brought his digital body weight scale from his
apartment to Mystery Spot intended for our simple experiment to measure my body weight on the two
standing positions of Shrink-and-Grow Mystery demonstration platform. However, that digital body weight
scale did not work in the Mystery Spot. It is very strange in that the digital body wight scale works properly in
my son's apartment in Mountain View both before and after our trip to Mystery Spot. We still do not know
why that digital body weight scale did not work in the Mystery Spot.

On the other hand, in my third visit of Mystery Spot in Santa Cruz on On January 11, 2016, we brought an
analog body weight scale for
my body weight measurements, the analog body weight scale worked well with
no problem.

8.3.2. Strange Behavior of GPS Navigator

I had another experience of very strange behavior of my portable GPS navigator when it was near the area of
a Mystery Spot, known as Cosmos Mystery Area, in South Dakota. It is described in more details in Section 8
on my web page at:

http://
www.shltrip.com/Additional_Information_On_Gravity_Hills.htm


8.3.3. Trouble with a Magnetometer

A gentleman with the name of Trento brought a magnetometer to do some measurements and testing in
Oregon Vortex. Mr. Trento complained of not being able to calibrate his machine back to a zero setting when
they are in certain area in the Oregon Vortex area. Evidently, such zero setting needs to be done after each
result in order to take a new reading. The instrument worked well otherwise, but such trouble happened only
in certain area in Oregon Vortex as described on Page 8 in
here.


Several other people have also reported similar failures or malfunction of their digital electronic devices when
they are in a Mystery Spot area. Some more examples can be seen
here,  here,  here and Page 8 in here.
By digging into visitors' reports on Internet, one may see more examples of such strange failures of digital
electronic devices in a Mystery Spot area.

Nobody knows or understands the reason(s) for such strange failures or malfunction of such digital electronic
devices. However, such strange failures or malfunction of some digital electronic devices in a Mystery Spot
area may be providing us a preliminary hint that there may be some yet unknown "dark" interaction processes
between Type B high density dark matter and these digital electronic devices in a Mystery Spot area. A
possible preliminary explanation is in Section 6.5 of my Web Page (2).

Therefore, the high concentration of Type B dark matter at these special locations of Mystery Spot areas and
Gravity Hills may be providing the golden opportunity for scientists to conduct next phase of more advanced
dark matter experiments to investigate the characteristics of dark matter and of the "dark" interaction
processes in the dark sector of universe.

8.4. Type B Dark Matter and Cycle of Mass Extinction on Earth

Mass extinctions on earth such as the one that wiped out the dinosaurs seem to happen with regularity,
pointing to possible cosmic causes.
Theoretical physicists Lisa Randall and Matthew Reece, of Harvard
University in Cambridge, Massachusetts, propose a mechanism for this regularity of about 35 million years. In
their proposal, there is a disk of higher density dark matter (i.e., Type B dark matter) that cuts the Milky Way
Galaxy into a top and a bottom half like the two bread slices in a sandwich. As the Solar system follows the
swirling motion of the Galaxy's arms, circling around the galactic centre, it also moves up and down,
periodically crossing this disk of Type B dark matter. Professors Randall and Reece suggest that as the
Solar system oscillates up and down, it crosses a denser layer of dark matter (i.e., Type B dark matter)
causing a gravitational push and pull that disturbs comets in the Oort cloud. In other words, the Solar
System's periodic passage through a 'dark disk' on the galactic plane triggers comet bombardments that
causes periodic mass extinctions on earth.

9. Concluding Remark

The experimental results, the hypothesis and the theories on this web page help us understand that:

(I) not all dark matters are Type A low density dark matter.

(II) a fraction of dark matter exists as very high density Type B dark matter at those special locations of
Gravity Hills and Mystery Spots on earth, and somewhere else such as the dark disk on the plane of Milky
Way Galaxy as described by Professor Lisa Randall.

(III) the concepts of dark radiation, dark light, and dark photon in dark sector of universe as proposed by
Professor Lisa Randall of Harvard University, Professor Sean Carroll at the California Institute of Technology,
and several other scientists are not just intellectual curiosity, but are essential processes for the existence of
Type B high density dark matter at hundreds of Gravity Hills and several Mystery Spots on earth and
somewhere else.

(IV) Many problems and mysteries observed in several independent astronomy observations all point
consistently to the existence of dark matter in galaxy dark matter halo.

(V) Many mysteries observed on hundreds of Gravity Hills and several Mystery Spots on earth all point
consistently to the existence of Type B high density dark matter at these special locations on earth and may
be somewhere else.

(VI) Type B dark matter may have been detected successfully already in the deep underground laboratories
in Italy and in Minnesota, USA, although the necessary follow up verification tests in these two deep
underground laboratories as described in Section 5 have yet to be done.

(VII) There are at least two different types of dark matter, thus we are making some progress in our
preliminary understanding of characteristics of dark matter and of their dark interaction processes in the dark
sector of the universe.

(VIII) It is important for the science community to recognize the importance of these special locations of
Gravity Hills and Mystery Spots for next phase of more advanced dark matter experiments so that we will
have better chance to find out what dark matter is, the space shrinking characteristics of dark matter and its
relation to dark energy and those unfamiliar processes of dark radiation, dark force, dark light, fifth force,
dark photos, etc. in the dark sector of universe.
Abstract

The 20-year experiment, known as DAMA/LIBRA collaboration, in the deep underground Gran Sasso
National L
aboratory under Gran Sasso Mountain in Italy for direct detection of dark matter has been
detecting consistently the annual modulation in the detected signal. The team of scientists running this
experiment in Italy believes that this annual modulation in detected signal is an indication of successful
detection of dark matter coming from the dark matter halo surrounding our Milky Way Galaxy and that the
annual modulation is due to the dark matter "wind" in galaxy dark matter halo as seen by the dark matter
detector on the earth while the earth orbits around the sun and the entire solar system orbits around the
center of Milky Way Galaxy. A similar deep underground experiment, known as CoGeNT, in Soudan,
Minnesota, USA has also detected the similar annual modulation in the detected signal.

On the other hand, Twelve or more deep underground laboratories that have been set up in other locations of
the world and have been running for many years all have consistently come up with null result, meaning
detecting no dark matter signal, coming up empty handed.

Another series of experiments, known as XENON1T, XENON100, and XENON10, using liquid xenon for dark
matter detection
were set up in the same huge Gran Sasso National Laboratory under the Gran Sasso
Mountain in Italy
. However, this series of xenon based experiments had also produced null result. The
location of the XENON Series of experiments is physically separated from
that of DAMA/LIBRA collaboration
by about 100 meters (about 300 feet) in the same huge Gran Sasso National Laboratory.

This has been a serious dilemma in science community for many years because the claimed detections of
dark matter
by DAMA/LIBRA in Italy and by CoGeNT in Minnesota, USA are NOT repeatable in all other
deep underground laboratories in other parts of the world
or in XENON Series of Experiments only 100
meters away from DAMA/LIBRA
. Many scientists seriously doubt the validity of the claim that dark matters
from galaxy dark matter halo have been detected in Italy.

Furthermore, in a
paper posted April 4, 2018 to the physics preprint site, arxiv.org, three physicists,
Professor Katherine Freese, Sebastian Baum and Chris Kelso,
showed that a standard dark-matter WIMP
cannot produce the  new (Phase 2) DAMA signal, the newer and better DAMA data in Phase 2 in recent
additional six years of data after the DAMA experiment system was upgraded to increase its sensitivity to
lower energy level. This paper further strengthen the serious doubt in the science community on the validity of
the claim that dark matters from galaxy dark matter halo have been detected in Italy. In other words, nobody
understands DAMA data.

Here in my web page I offer a proposal to resolve this serious dilemma and to explain (a) why DAMA/LIBRA
in Italy and CoGeNT in Minnesota have detected high density dark matters (not in galaxy dark matter halo)
and (b) why all underground laboratories, including DAMA/LIBRA, XENON
Series and CoGeNT, at all
locations all over the world have NOT detected low density dark matters from galaxy dark matter halo.

In my proposal, there are at least two different types of dark matter: Type A low density dark matter in
galaxy dark matter halo and Type B high density dark matter at the special locations of Gravity Hills and
Mystery Spot areas on earth and may be somewhere else in the universe. So far, science still knows very
little about dark matter. There is no proof that there is only one kind of simple dark matter in the entire
universe. Since dark matter constitutes 8
4% of matters in the universe, it is quite possible that there are two
or more different kinds of dark matter.

My out-of-box thinking to resolve this serious dilemma on dark matter detection comes from my research for
more than 20 years on gravity mysteries on many Gravity Hills and in several Mystery Spots on earth. My
different background and more than 20 years of research enable me to show that: (1) What have been
detected successfully in Italy and in Minnesota, USA are Type B high density dark matter (not in galaxy dark
matter halo), and (2) None of these deep underground laboratories have detected Type A dark matter in
galaxy dark matter halo because Type A dark matter particles may be super-heavy dark matter particles
which may be much heavier than the popular assumption of WIMP by many orders of magnitude. This means
that (a) the density of dark matter in galaxy dark matter halo is much lower than that of assumed WIMP
model by several orders of magnitude, and (b) with such very low density, it may take thousands of years or
even longer of experiment to detect any appreciable number of rare collisions with such very low density dark
matters in galaxy dark matter halo.

Furthermore, the distribution of high density Type B dark matter in the earth is NOT uniform, but is highly
concentrated at special locations such as those know gravity hills and mystery spots on the earth. This is
why most other experiments have detected nothing because most of those experiments are at the wrong
locations where there are no high density dark matter in those locations on the earth and a few years of
experiment is much too short to detect the rare collision with the very low density of super-heavy dark matter
particles in the galaxy dark matter halo.

I also propose four verification tests in Section 5 to test for four signatures of high density type B dark matter
near the dark matter detectors of the deep underground laboratories in Italy and in Minnesota. It is important
to carry out these tests to verify successful direct detection of high density Type B dark matter in the deep
underground laboratories in Italy and in Minnesota.

More detailed explanations and supporting evidences are in the following.


Note: I started presenting this Web Page (3) on August 29, 2016. I have been revising and updating this web
page from time to time as I gain more insight and relevant information from my ongoing research on this
project. Most recent update of this web page was on April 23, 2018.  As of April 24, 2017 this web page has
been accessed at least 743 times by my friends and strangers all over the world.

Note: Dr. Sing Lin presented a talk entitled "Great Mysteries of Dark Matter in Astronomy and on Earth" in a
meeting in Monmouth County Library in Manalapan, New Jersey, USA on September 29, 2016. This
presentation describes (1) the highlights of the ongoing global research and experiments in astronomy and on
earth on dark matter and (2) the highlights of my research for more than 20 years on very high
concentrations of dark matter at the special locations of Gravity Hills and Mystery Spots on earth and of their
important implications to the direct detection of dark matter on earth.  This meeting was co-sponsored by
IEEE (Institute of Electrical and Electronics Engineers) New Jersey Coast Life Member Group and IEEE
New Jersey Coast EMC/VT/AP Chapter.

The PowerPoint file presented by Dr. Sing Lin on September 29, 2016 is in the following: