As we know dark matter is everywhere and it is not discovered yet. But, Evidence for dark matter can be seen in everything from the warping of light near galaxies to the way galaxies cluster together. Now researchers revealed some interesting data that could be the evidence of data matter.
Dark matter does not interact with any of the strongly energy field and even light. dark matter invisible and contributes nearly 85% of total universe. even though it is invisible it interacts with matter in a subtle way like a neutrino interacts with particles.
Neutrino does not interact with regular particles, it collide with nucleus and emits 2 photons.these kind of collisions are happen only at the earth magnetosphere and in space not on earth. even now a million and billion of photons passes through our body and we are even aware of it. These collisions are so rare that neutrino observatories often involve sensitive detectors within large regions of fluid or ice. Since dark matter should similarly interact with regular matter, dark matter observatories follow a similar design.
The XENON dark matter research project, operated at the Italian Gran Sasso National Laboratory, is a deep underground research facility featuring increasingly ambitious experiments aiming to detect dark matter particles. The experiments aim to detect particles in the form of weakly interacting massive particles (WIMPs), and these WIMPS are heavier then the neutrino, thereby we can able to differentiate the interactions via nuclear recoils in a liquid xenon target chamber. But still researchers can't find any of the WIMPs.
So, researchers are trying to find another kind of dark matter called Axions. Axions were first proposed in 1977 to solve some subtle problems in particle physics, but their theoretical properties are similar to those of dark matter. The main problem in axion detection is it is similar to other know particle interactions like radioactive decay of atoms in detector and other neutrino collision. but these evens are well known and it can be pre determined. If axions are real, they should produce an excess of events. It would be a signal above the background noise. The graph obtained for number of events and energy is :
Here in the data the red lines are the background signal and the black lines are the event data. This graph satisfies except at the lower energy level of signals. But alone with this, we cannot conclude that it must be a dark matter, several other interactions produce a similar signal. The detector could have some small contamination, such as trace amounts of hydrogen-3. If this is an axion signal, then further studies will confirm it.
Related article :
Dark matter does not interact with any of the strongly energy field and even light. dark matter invisible and contributes nearly 85% of total universe. even though it is invisible it interacts with matter in a subtle way like a neutrino interacts with particles.
Neutrino does not interact with regular particles, it collide with nucleus and emits 2 photons.these kind of collisions are happen only at the earth magnetosphere and in space not on earth. even now a million and billion of photons passes through our body and we are even aware of it. These collisions are so rare that neutrino observatories often involve sensitive detectors within large regions of fluid or ice. Since dark matter should similarly interact with regular matter, dark matter observatories follow a similar design.
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| A hypothetical axion collides with electrons in XENON1T. Credit: SLAC National Accelerator Laboratory |
The XENON dark matter research project, operated at the Italian Gran Sasso National Laboratory, is a deep underground research facility featuring increasingly ambitious experiments aiming to detect dark matter particles. The experiments aim to detect particles in the form of weakly interacting massive particles (WIMPs), and these WIMPS are heavier then the neutrino, thereby we can able to differentiate the interactions via nuclear recoils in a liquid xenon target chamber. But still researchers can't find any of the WIMPs.
So, researchers are trying to find another kind of dark matter called Axions. Axions were first proposed in 1977 to solve some subtle problems in particle physics, but their theoretical properties are similar to those of dark matter. The main problem in axion detection is it is similar to other know particle interactions like radioactive decay of atoms in detector and other neutrino collision. but these evens are well known and it can be pre determined. If axions are real, they should produce an excess of events. It would be a signal above the background noise. The graph obtained for number of events and energy is :
 |
| Excess events seen by XENON1T. Credit: E. Aprile, et al |
Here in the data the red lines are the background signal and the black lines are the event data. This graph satisfies except at the lower energy level of signals. But alone with this, we cannot conclude that it must be a dark matter, several other interactions produce a similar signal. The detector could have some small contamination, such as trace amounts of hydrogen-3. If this is an axion signal, then further studies will confirm it.
Related article :
Hubble detected smallest and coldest dark matter clump
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