Dense Axion Stars.

@article{Braaten2016DenseAS,
  title={Dense Axion Stars.},
  author={Eric Braaten and Abhishek Ray Mohapatra and Hong Zhang},
  journal={Physical review letters},
  year={2016},
  volume={117 12},
  pages={
          121801
        }
}
If the dark matter particles are axions, gravity can cause them to coalesce into axion stars, which are stable gravitationally bound systems of axions. In the previously known solutions for axion stars, gravity and the attractive force between pairs of axions are balanced by the kinetic pressure. The mass of these dilute axion stars cannot exceed a critical mass, which is about 10^{-14}M_{⊙} if the axion mass is 10^{-4}  eV. We study axion stars using a simple approximation to the effective… Expand
Axion Stars
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TLDR
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References

SHOWING 1-10 OF 22 REFERENCES
Axions and the galactic angular momentum distribution
We analyze the behavior of axion dark matter before it falls into a galactic gravitational potential well. The axions thermalize sufficiently fast by gravitational self-interactions that almost allExpand
Axion stars in the infrared limit
A bstractFollowing Ruffini and Bonazzola, we use a quantized boson field to describe condensates of axions forming compact objects. Without substantial modifications, the method can only be appliedExpand
Bose-Einstein condensation of dark matter axions.
TLDR
Axion BEC provides a mechanism for the production of net overall rotation in dark matter halos, and for the alignment of cosmic microwave anisotropy multipoles. Expand
Self-gravitating system made of axions
We show that the inclusion of an axionlike effective potential in the construction of a self-gravitating system of scalar fields decreases its compactness when the value of the self-interactionExpand
Axion miniclusters and Bose stars.
  • Kolb, Tkachev
  • Physics, Medicine
  • Physical review letters
  • 1993
TLDR
It is found that perturbations on scales corresponding to causally disconnected regions at T T GeV can lead to very dense axion clumps, with present density high enough for the collisional 2a\ensuremath{\rightarrow}2a process to lead to Bose-Einstein relaxation in the gravitationally bound clumps of axions, forming Bose stars. Expand
On the possibility of Bose-star formation
Abstract The relaxation time of a gravitationally bounded cloud of bosons is estimated for the case of a large phase-space density of particles. The axionic mass and self-coupling relaxation time areExpand
Axion dark matter and cosmological parameters.
TLDR
It is observed that photon cooling after big bang nucleosynthesis but before recombination can remove the conflict between the observed and theoretically predicted value of the primordial abundance of ^{7}Li, and a high effective number of neutrinos as measured by the cosmic microwave anisotropy spectrum is predicted. Expand
New limits on primordial black hole dark matter from an analysis of Kepler source microlensing data.
TLDR
It is found that PBH DM with masses in the range 2 × 10(-9) M[Symbol: see text] to 10(-7)M cannot make up the entirety of the DM in the Milky Way. Expand
Dynamics of collapsing and exploding Bose–Einstein condensates
TLDR
The dynamics of how a Bose–Einstein condensate collapses and subsequently explodes when the balance of forces governing its size and shape is suddenly altered is explored. Expand
Mass-radius relation of Newtonian self-gravitating Bose-Einstein condensates with short-range interactions: II. Numerical results
We develop the suggestion that dark matter could be a Bose-Einstein condensate. We determine the mass-radius relation of a Newtonian self-gravitating Bose-Einstein condensate with short-rangeExpand
...
1
2
3
...