# Axion miniclusters and Bose stars.

@article{Kolb1993AxionMA, title={Axion miniclusters and Bose stars.}, author={Kolb and Tkachev}, journal={Physical review letters}, year={1993}, volume={71 19}, pages={ 3051-3054 } }

Evolution of inhomogeneities in the axion field around the QCD epoch is studied numerically, including for the first time important nonlinear effects. It is found that perturbations on scales corresponding to causally disconnected regions at T\ensuremath{\sim}1 GeV can lead to very dense axion clumps, with present density ${\mathrm{\ensuremath{\rho}}}_{\mathit{a}}$\ensuremath{\gtrsim}${10}^{\mathrm{\ensuremath{-}}8}$ g ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}3}$. This is high enough for the… Expand

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#### References

SHOWING 1-9 OF 9 REFERENCES

The early Universe

- Physics
- Nature
- 1981

In the past few years one of the most exciting areas of research in physics has been the interdisciplinary field of cosmology and particle physics. The NSF's Institute for Theoretical Physics in… Expand

Phys. Rep. C197 Phys. Rep. C198

- Phys. Rep. C197 Phys. Rep. C198
- 1990

This does not necessarily require the reheating temperature after inflation to be higher than f a , since inflation itself can produce strong fluctuations in the axion field as discussed in

- Phys. Rev. D
- 1990

I. I. Tkachev, Sov. Astron. Lett

- I. I. Tkachev, Sov. Astron. Lett
- 1986

Phys. Rev. D

- Phys. Rev. D
- 1986

Phys. Rev. Lett

- Phys. Rev. Lett
- 1983

Rev. Mod. Phys

- Rev. Mod. Phys
- 1981

Phys. Rev. Phys. Lett. B140

- Phys. Rev. Phys. Lett. B140
- 1969

We will discuss in a future paper the possibility that collapsing domain walls leave behind very dense clumps of non-relativistic axions

- We will discuss in a future paper the possibility that collapsing domain walls leave behind very dense clumps of non-relativistic axions