Structure formation and exotic compact objects in a dissipative dark sector

Jae Hyeok Chang, Daniel Egana-Ugrinovic, Rouven Essig, Chris Kouvaris

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We present the complete history of structure formation in a simple dissipative dark-sector model. The model has only two particles: a dark electron, which is a subdominant component of dark matter, and a dark photon. Dark-electron perturbations grow from primordial overdensities, become non-linear, and form dense dark galaxies. Bremsstrahlung cooling leads to fragmentation of the dark-electron halos into clumps that vary in size from a few to millions of solar masses, depending on the particle model parameters. In particular, we show that asymmetric dark stars and black holes form within the Milky Way from the collapse of dark electrons. These exotic compact objects may be detected and their properties measured at new high-precision astronomical observatories, giving insight into the particle nature of the dark sector without the requirement of non-gravitational interactions with the visible sector. Our analysis demonstrates that a full study of the structure-formation history is needed to assess correctly the viability of exotic compact objects in dissipative dark-sector models.

Original languageEnglish
Article number036
JournalJournal of Cosmology and Astroparticle Physics
Volume2019
Issue number3
ISSN1475-7516
DOIs
Publication statusPublished - 22. Mar 2019

Keywords

  • cosmology of theories beyond the SM
  • dark matter theory
  • galaxy formation
  • stars

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