What is the mass of an axion?
An axion mass estimate between 0.05–1.50 meV was reported by Borsanyi et al. (2016).
What is the axion particle?
The axion is a hypothetical elementary particle that has both low mass and low energy. Itwas first proposed as a hypothetical particle in 1977 as a solution to what is called the “strong CP problem” in particle physics.
Is the axion a boson?
The prototype for a pseudo-scalar boson is the axion, which is “ultralight” with mass m ≪ 1 eV.
Are axions relativistic?
The couplings and masses of these axions can span many orders of magnitude, and cosmology leads us to consider several distinct populations of axions behaving as coherent condensates, or relativistic particles.
Why is axion dark matter?
Background. The axion is a hypothetical elementary particle originally postulated to solve the strong CP problem. The axion is also an extremely attractive dark matter candidate. The axion is the puzzle piece allowing these two mysteries to fit naturally into our understanding of the universe.
Why are axions good dark matter candidates?
Axions, one of the leading candidates for dark matter, may be able to be converted to photons (and vice versa) under the right conditions. If we can cause and control their conversion, we might discover our first particle beyond the Standard Model, and possibly solve the dark matter and strong CP problems as well.
Are axions detected?
And according to a paper published in March, laboratory-made axions might have been detected for the first time by an experiment in Italy known as PVLAS (polarization of the vacuum with a laser). Axions are posited to have exceedingly low mass–less than a millionth that of an electron–and are electrically neutral.
Is axion a WIMP?
Axions are even trickier than WIMPs. They’re theorized to be extremely light—a millionth of an electronvolt or so, about a trillion times lighter than the already tiny electron—making them next to impossible to produce or study in a traditional particle physics experiment.
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Can axions make dark matter?
Although it’s model dependent, if the axion is in the range of having a few micro-electron-Volts of rest mass energy, axions could indeed compose up to 100% of the dark matter in our Universe.
What are axion stars?
The particle that makes up the dark matter of the universe could be an axion or axion-like particle. A collection of axions can condense into a bound Bose-Einstein condensate called an axion star. It is possible that a significant fraction of the axion dark matter is in the form of axion stars.
Is dark energy the strong force?
Some physicists have proposed that dark energy is a fifth fundamental force — adding to the well-known gravity, electromagnetic, weak nuclear and strong nuclear forces. This hypothesis has been put to the test by researchers at Imperial College London and the University of Nottingham.
Does dark matter have gravity?
The even distribution means that dark energy does not have any local gravitational effects, but rather a global effect on the universe as a whole. This leads to a repulsive force, which tends to accelerate the expansion of the universe.
Can we contain dark matter?
Dark matter is a hypothetical form of matter thought to account for approximately 85% of the matter in the universe….Composition.
| Light bosons | quantum chromodynamics axions |
|---|---|
| weak scale | simplified models |
| other particles | Weakly interacting massive particles |
| self-interacting dark matter |
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