scholarly journals Two-component axionic dark matter halos

2020 ◽  
Vol 35 (26) ◽  
pp. 2050227 ◽  
Author(s):  
Gennady P. Berman ◽  
Vyacheslav N. Gorshkov ◽  
Vladimir I. Tsifrinovich ◽  
Marco Merkli ◽  
Vladimir V. Tereshchuk
Keyword(s):  
Dark Matter ◽  
Ground State ◽  
Mass Density ◽  
Mean Field ◽  
Einstein Condensate ◽  
Dark Matter Halo ◽  
Bose Einstein Condensate ◽  
Interesting Connection ◽  
Two Component ◽  
Bose Einstein

We consider a two-component dark matter halo (DMH) of a galaxy containing ultra-light axions (ULA) of different mass. The DMH is described as a Bose–Einstein condensate (BEC) in its ground state. In the mean-field (MF) limit, we have derived the integro-differential equations for the spherically symmetrical wave functions of the two DMH components. We studied, numerically, the radial distribution of the mass density of ULA and constructed the parameters which could be used to distinguish between the two- and one-component DMH. We also discuss an interesting connection between the BEC ground state of a one-component DMH and Black Hole temperature and entropy, and Unruh temperature.

Bose–Einstein condensate of ultra-light axions as a candidate for the dark matter galaxy halos

2019 ◽  
Vol 34 (30) ◽  
pp. 1950361 ◽  
Author(s):  
Gennady P. Berman ◽  
Vyacheslav N. Gorshkov ◽  
Vladimir I. Tsifrinovich ◽  
Marco Merkli ◽  
Xidi Wang
Keyword(s):  
Dark Matter ◽  
Schrödinger Equation ◽  
Ground State ◽  
Schrodinger Equation ◽  
Spiral Galaxies ◽  
Einstein Condensate ◽  
Dark Matter Halo ◽  
Bose Einstein Condensate ◽  
Galaxy Halos ◽  
Bose Einstein

We suggest that the dark matter halo in some of the spiral galaxies can be described as the ground state of the Bose–Einstein condensate of ultra-light self-gravitating axions. We have also developed an effective “dissipative” algorithm for the solution of nonlinear integro-differential Schrödinger equation describing self-gravitating Bose–Einstein condensate. The mass of an ultra-light axion is estimated.

Dynamics and Ground State Properties of Two-component Bose-Einstein Condensate in Different Hyperfine States

2010 ◽  
Vol 161 (3-4) ◽  
pp. 334-347 ◽  
Author(s):  
Chen Liang ◽  
Kong Wei ◽  
B. J. Ye ◽  
H. M. Wen ◽  
X. Y. Zhou ◽  
...  
Keyword(s):  
Ground State ◽  
Einstein Condensate ◽  
Bose Einstein Condensate ◽  
Ground State Properties ◽  
Two Component ◽  
Bose Einstein

scholarly journals Spatially non-uniform ground state and quantized vortices in a two-component Bose-Einstein condensate of magnons

2012 ◽  
Vol 2 (1) ◽  
Author(s):  
P. Nowik-Boltyk ◽  
O. Dzyapko ◽  
V. E. Demidov ◽  
N. G. Berloff ◽  
S. O. Demokritov
Keyword(s):  
Ground State ◽  
Einstein Condensate ◽  
Quantized Vortices ◽  
Bose Einstein Condensate ◽  
Two Component ◽  
Bose Einstein

scholarly journals Ground state of a two-component dipolar Bose-Einstein condensate confined in a coupled annular potential

2015 ◽  
Vol 64 (6) ◽  
pp. 060302
Author(s):  
Zhang Xiao-Fei ◽  
Zhang Pei ◽  
Chen Guang-Ping ◽  
Dong Biao ◽  
Tan Ren-Bing ◽  
...  
Keyword(s):  
Ground State ◽  
Einstein Condensate ◽  
Bose Einstein Condensate ◽  
Two Component ◽  
Bose Einstein

scholarly journals STABILITY OF BOSE-EINSTEIN CONDENSATES IN A PT-SYMMETRIC DOUBLE-δ POTENTIAL CLOSE TO BRANCH POINTS

2014 ◽  
Vol 54 (2) ◽  
pp. 133-138 ◽  
Author(s):  
Andreas Löhle ◽  
Holger Cartarius ◽  
Daniel Haag ◽  
Dennis Dast ◽  
Jörg Main ◽  
...  
Keyword(s):  
Ground State ◽  
Mean Field ◽  
Einstein Condensate ◽  
Pitaevskii Equation ◽  
Branch Points ◽  
Mean Field Limit ◽  
Bose Einstein Condensate ◽  
Stability Change ◽  
The Difference ◽  
Bose Einstein

A Bose-Einstein condensate trapped in a double-well potential, where atoms are incoupled to one side and extracted from the other, can in the mean-field limit be described by the nonlinear Gross-Pitaevskii equation (GPE) with a <em>PT</em> symmetric external potential. If the strength of the in- and outcoupling is increased two <em>PT</em> broken states bifurcate from the <em>PT</em> symmetric ground state. At this bifurcation point a stability change of the ground state is expected. However, it is observed that this stability change does not occur exactly at the bifurcation but at a slightly different strength of the in-/outcoupling effect. We investigate a Bose-Einstein condensate in a <em>PT</em> symmetric double-δ potential and calculate the stationary states. The ground state’s stability is analysed by means of the Bogoliubov-de Gennes equations and it is shown that the difference in the strength of the in-/outcoupling between the bifurcation and the stability change can be completely explained by the norm-dependency of the nonlinear term in the Gross-Pitaevskii equation.

scholarly journals Axionic dark matter halos in the gravitational field of baryonic matter

2020 ◽  
Vol 35 (26) ◽  
pp. 2050248
Author(s):  
Gennady P. Berman ◽  
Vyacheslav N. Gorshkov ◽  
Vladimir I. Tsifrinovich
Keyword(s):  
Dark Matter ◽  
Gravitational Field ◽  
Mean Field ◽  
Characteristic Size ◽  
Analytical Approximation ◽  
Einstein Condensate ◽  
Dark Matter Halo ◽  
Baryonic Matter ◽  
Hartree Fock ◽  
Bose Einstein Condensate

We consider a dark matter halo (DMH) of a spherical galaxy as a Bose–Einstein condensate (BEC) of the ultra-light axions (ULA) interacting with the baryonic matter. In the mean-field (MF) limit, we have derived the integro-differential equation of the Hartree–Fock type for the spherically symmetrical wave function of the DMH component. This equation includes two independent dimensionless parameters: (i) [Formula: see text] is the ratio of baryon and axion total mases and (ii) [Formula: see text] is the ratio of characteristic baryon and axion spatial parameters. We extended our “dissipation algorithm” for studying numerically the ground state of the axion halo in the gravitational field produced by the baryonic component. We calculated the characteristic size, [Formula: see text] of DMH as a function of [Formula: see text] and [Formula: see text] and obtained an analytical approximation for [Formula: see text].

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