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Title: Dark matter relics and the expansion rate in scalar-tensor theories

Abstract

We study the impact of a modified expansion rate on the dark matter relic abundance in a class of scalar-tensor theories. The scalar-tensor theories we consider are motivated from string theory constructions, which have conformal as well as disformally coupled matter to the scalar. We investigate the effects of such a conformal coupling to the dark matter relic abundance for a wide range of initial conditions, masses and cross-sections. We find that exploiting all possible initial conditions, the annihilation cross-section required to satisfy the dark matter content can differ from the thermal average cross-section in the standard case. We also study the expansion rate in the disformal case and find that physically relevant solutions require a nontrivial relation between the conformal and disformal functions. We study the effects of the disformal coupling in an explicit example where the disformal function is quadratic.

Authors:
;  [1];  [2]
  1. Mitchell Institute for Fundamental Physics and Astronomy, Department of Physics and Astronomy, Texas A and M University, College Station, TX 77843 (United States)
  2. Department of Physics, Swansea University, Singleton Park, Swansea, SA2 8PP (United Kingdom)
Publication Date:
OSTI Identifier:
22676152
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2017; Journal Issue: 06; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ABUNDANCE; ANNIHILATION; COMPUTERIZED SIMULATION; COUPLING; CROSS SECTIONS; EXPANSION; FIELD THEORIES; MASS; MATHEMATICAL SOLUTIONS; NONLUMINOUS MATTER; STRING THEORY

Citation Formats

Dutta, Bhaskar, Jimenez, Esteban, and Zavala, Ivonne, E-mail: dutta@physics.tamu.edu, E-mail: este1985@physics.tamu.edu, E-mail: e.i.zavalacarrasco@swansea.ac.uk. Dark matter relics and the expansion rate in scalar-tensor theories. United States: N. p., 2017. Web. doi:10.1088/1475-7516/2017/06/032.
Dutta, Bhaskar, Jimenez, Esteban, & Zavala, Ivonne, E-mail: dutta@physics.tamu.edu, E-mail: este1985@physics.tamu.edu, E-mail: e.i.zavalacarrasco@swansea.ac.uk. Dark matter relics and the expansion rate in scalar-tensor theories. United States. doi:10.1088/1475-7516/2017/06/032.
Dutta, Bhaskar, Jimenez, Esteban, and Zavala, Ivonne, E-mail: dutta@physics.tamu.edu, E-mail: este1985@physics.tamu.edu, E-mail: e.i.zavalacarrasco@swansea.ac.uk. Thu . "Dark matter relics and the expansion rate in scalar-tensor theories". United States. doi:10.1088/1475-7516/2017/06/032.
@article{osti_22676152,
title = {Dark matter relics and the expansion rate in scalar-tensor theories},
author = {Dutta, Bhaskar and Jimenez, Esteban and Zavala, Ivonne, E-mail: dutta@physics.tamu.edu, E-mail: este1985@physics.tamu.edu, E-mail: e.i.zavalacarrasco@swansea.ac.uk},
abstractNote = {We study the impact of a modified expansion rate on the dark matter relic abundance in a class of scalar-tensor theories. The scalar-tensor theories we consider are motivated from string theory constructions, which have conformal as well as disformally coupled matter to the scalar. We investigate the effects of such a conformal coupling to the dark matter relic abundance for a wide range of initial conditions, masses and cross-sections. We find that exploiting all possible initial conditions, the annihilation cross-section required to satisfy the dark matter content can differ from the thermal average cross-section in the standard case. We also study the expansion rate in the disformal case and find that physically relevant solutions require a nontrivial relation between the conformal and disformal functions. We study the effects of the disformal coupling in an explicit example where the disformal function is quadratic.},
doi = {10.1088/1475-7516/2017/06/032},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 06,
volume = 2017,
place = {United States},
year = {Thu Jun 01 00:00:00 EDT 2017},
month = {Thu Jun 01 00:00:00 EDT 2017}
}