XI Conference of Young Scientists "Problems of Theoretical Physics"

21-23 December 2020
Online meeting
Europe/Kiev timezone

Two-phase structure of ultralight dark matter with $\psi^6$ self-interaction.

22 Dec 2020, 12:30
20m
Online meeting

Online meeting

Oral talk Astrophysics and Cosmology

Speaker

M. V. Khelashvili (Bogolubov Institute for Theoretical Physics)

Description

The ultralight dark matter (ULDM) model (also known as fuzzy dark matter or Bose-Einstein condensate dark matter) is one of alternatives to the cold dark matter (CDM) paradigm. It suggests that the dark matter particles are ultralight bosons with a tiny mass order of $10^{-22}$ eV, so that their de Broglie wavelength is of kiloparsec scale, that helps to resolve CDM tensions on the small scales. We consider ultralight scalar bosons condensate with $\psi^6$ self-interaction, which has a noticeable effect on the dark matter density distribution in highly dense regions, such as a central core of galactic dark matter halo or overlap of dark matter halo during the galaxies collision. At the same time, a contribution of tree-particles interaction is negligible in an outer part of the galactic dark matter halo and intergalactic medium. Thus all ULDM predictions on the large scales remain valid for the $\psi^6$ model, which, in turn, coincide with CDM predictions on these scales and are in agreement with observations. From the detailed analysis of thermodynamic characteristics of ULDM with $\psi^6$ self-interaction, we find the existence of two phases of dark matter separated by instability region in the (high density) core of dark matter halo.

Primary authors

Prof. A. M. Gavrilik M. V. Khelashvili (Bogolubov Institute for Theoretical Physics)

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