skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Light dark matter through assisted annihilation

Abstract

In this paper we investigate light dark matter scenarios where annihilation to Standard Model particles at tree-level is kinematically forbidden. In such cases annihilation can be aided by massive Standard Model-like species, called assisters , in the initial state that enhances the available phase space opening up novel tree-level processes. We investigate the feasibility of such non-standard assisted annihilation processes to reproduce the observed relic density of dark matter. We present a simple scalar dark matter-scalar assister model where this is realised. We find that if the dark matter and assister are relatively degenerate the required relic density can be achieved for a keV-MeV scale dark matter. We briefly discuss the cosmological constraints on such dark matter scenarios.

Authors:
 [1]; ;  [2]
  1. Centre for Theoretical Studies, Indian Institute of Technology, Kharagpur 721302 (India)
  2. Department of Physics, Indian Institute of Technology, Kharagpur 721302 (India)
Publication Date:
OSTI Identifier:
22679960
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2017; Journal Issue: 03; 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; ANNIHILATION; DENSITY; KEV RANGE; MEV RANGE; NONLUMINOUS MATTER; PHASE SPACE; STANDARD MODEL

Citation Formats

Dey, Ujjal Kumar, Maity, Tarak Nath, and Ray, Tirtha Sankar, E-mail: ujjal@cts.iitkgp.ernet.in, E-mail: tarak.maity.physics@gmail.com, E-mail: tirthasankar.ray@gmail.com. Light dark matter through assisted annihilation. United States: N. p., 2017. Web. doi:10.1088/1475-7516/2017/03/045.
Dey, Ujjal Kumar, Maity, Tarak Nath, & Ray, Tirtha Sankar, E-mail: ujjal@cts.iitkgp.ernet.in, E-mail: tarak.maity.physics@gmail.com, E-mail: tirthasankar.ray@gmail.com. Light dark matter through assisted annihilation. United States. doi:10.1088/1475-7516/2017/03/045.
Dey, Ujjal Kumar, Maity, Tarak Nath, and Ray, Tirtha Sankar, E-mail: ujjal@cts.iitkgp.ernet.in, E-mail: tarak.maity.physics@gmail.com, E-mail: tirthasankar.ray@gmail.com. Wed . "Light dark matter through assisted annihilation". United States. doi:10.1088/1475-7516/2017/03/045.
@article{osti_22679960,
title = {Light dark matter through assisted annihilation},
author = {Dey, Ujjal Kumar and Maity, Tarak Nath and Ray, Tirtha Sankar, E-mail: ujjal@cts.iitkgp.ernet.in, E-mail: tarak.maity.physics@gmail.com, E-mail: tirthasankar.ray@gmail.com},
abstractNote = {In this paper we investigate light dark matter scenarios where annihilation to Standard Model particles at tree-level is kinematically forbidden. In such cases annihilation can be aided by massive Standard Model-like species, called assisters , in the initial state that enhances the available phase space opening up novel tree-level processes. We investigate the feasibility of such non-standard assisted annihilation processes to reproduce the observed relic density of dark matter. We present a simple scalar dark matter-scalar assister model where this is realised. We find that if the dark matter and assister are relatively degenerate the required relic density can be achieved for a keV-MeV scale dark matter. We briefly discuss the cosmological constraints on such dark matter scenarios.},
doi = {10.1088/1475-7516/2017/03/045},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 03,
volume = 2017,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}