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

Title: Origin of ΔN{sub eff} as a result of an interaction between dark radiation and dark matter

Abstract

Results from the Wilkinson Microwave Anisotropy Probe (WMAP), Atacama Cosmology Telescope (ACT) and recently from the South Pole Telescope (SPT) have indicated the possible existence of an extra radiation component in addition to the well known three neutrino species predicted by the Standard Model of particle physics. In this paper, we explore the possibility of the apparent extra dark radiation being linked directly to the physics of cold dark matter (CDM). In particular, we consider a generic scenario where dark radiation, as a result of an interaction, is produced directly by a fraction of the dark matter density effectively decaying into dark radiation. At an early epoch when the dark matter density is negligible, as an obvious consequence, the density of dark radiation is also very small. As the Universe approaches matter radiation equality, the dark matter density starts to dominate thereby increasing the content of dark radiation and changing the expansion rate of the Universe. As this increase in dark radiation content happens naturally after Big Bang Nucleosynthesis (BBN), it can relax the possible tension with lower values of radiation degrees of freedom measured from light element abundances compared to that of the CMB. We numerically confront this scenariomore » with WMAP+ACT and WMAP+SPT data and derive an upper limit on the allowed fraction of dark matter decaying into dark radiation.« less

Authors:
 [1];  [2];  [3]
  1. Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C (Denmark)
  2. Institut für Theoretische Teilchenphysik und Kosmologie, RWTH Aachen, D-52056 Aachen (Germany)
  3. Department of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD (United Kingdom)
Publication Date:
OSTI Identifier:
22279969
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2012; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANISOTROPY; ASTROPHYSICS; COMPARATIVE EVALUATIONS; COSMOLOGY; DEGREES OF FREEDOM; DENSITY; ELEMENT ABUNDANCE; EXPANSION; NEUTRINOS; NONLUMINOUS MATTER; NUCLEOSYNTHESIS; STANDARD MODEL; UNIVERSE; VISIBLE RADIATION

Citation Formats

Bjaelde, Ole Eggers, Das, Subinoy, and Moss, Adam. Origin of ΔN{sub eff} as a result of an interaction between dark radiation and dark matter. United States: N. p., 2012. Web. doi:10.1088/1475-7516/2012/10/017.
Bjaelde, Ole Eggers, Das, Subinoy, & Moss, Adam. Origin of ΔN{sub eff} as a result of an interaction between dark radiation and dark matter. United States. https://doi.org/10.1088/1475-7516/2012/10/017
Bjaelde, Ole Eggers, Das, Subinoy, and Moss, Adam. Mon . "Origin of ΔN{sub eff} as a result of an interaction between dark radiation and dark matter". United States. https://doi.org/10.1088/1475-7516/2012/10/017.
@article{osti_22279969,
title = {Origin of ΔN{sub eff} as a result of an interaction between dark radiation and dark matter},
author = {Bjaelde, Ole Eggers and Das, Subinoy and Moss, Adam},
abstractNote = {Results from the Wilkinson Microwave Anisotropy Probe (WMAP), Atacama Cosmology Telescope (ACT) and recently from the South Pole Telescope (SPT) have indicated the possible existence of an extra radiation component in addition to the well known three neutrino species predicted by the Standard Model of particle physics. In this paper, we explore the possibility of the apparent extra dark radiation being linked directly to the physics of cold dark matter (CDM). In particular, we consider a generic scenario where dark radiation, as a result of an interaction, is produced directly by a fraction of the dark matter density effectively decaying into dark radiation. At an early epoch when the dark matter density is negligible, as an obvious consequence, the density of dark radiation is also very small. As the Universe approaches matter radiation equality, the dark matter density starts to dominate thereby increasing the content of dark radiation and changing the expansion rate of the Universe. As this increase in dark radiation content happens naturally after Big Bang Nucleosynthesis (BBN), it can relax the possible tension with lower values of radiation degrees of freedom measured from light element abundances compared to that of the CMB. We numerically confront this scenario with WMAP+ACT and WMAP+SPT data and derive an upper limit on the allowed fraction of dark matter decaying into dark radiation.},
doi = {10.1088/1475-7516/2012/10/017},
url = {https://www.osti.gov/biblio/22279969}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 10,
volume = 2012,
place = {United States},
year = {2012},
month = {10}
}