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Title: Asymmetric Dark Matter and Dark Radiation

Abstract

Asymmetric Dark Matter (ADM) models invoke a particle-antiparticle asymmetry, similar to the one observed in the Baryon sector, to account for the Dark Matter (DM) abundance. Both asymmetries are usually generated by the same mechanism and generally related, thus predicting DM masses around 5 GeV in order to obtain the correct density. The main challenge for successful models is to ensure efficient annihilation of the thermally produced symmetric component of such a light DM candidate without violating constraints from collider or direct searches. A common way to overcome this involves a light mediator, into which DM can efficiently annihilate and which subsequently decays into Standard Model particles. Here we explore the scenario where the light mediator decays instead into lighter degrees of freedom in the dark sector that act as radiation in the early Universe. While this assumption makes indirect DM searches challenging, it leads to signals of extra radiation at BBN and CMB. Under certain conditions, precise measurements of the number of relativistic species, such as those expected from the Planck satellite, can provide information on the structure of the dark sector. We also discuss the constraints of the interactions between DM and Dark Radiation from their imprint inmore » the matter power spectrum.« less

Authors:
 [1];  [2];  [3];  [4];  [5]
  1. Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg (Germany)
  2. Theory Division, Physics Department, CERN, CH-1211 Geneva 23 (Switzerland)
  3. Instituto de Física Corpuscular, CSIC-Universitat de València, 22085, E-46071 Valencia (Spain)
  4. Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 München (Germany)
  5. Institut d'Astrophysique Spatiale, UMR8617, Universite Paris-Sud and CNRS, Bat. 121, Orsay F-91405 (France)
Publication Date:
OSTI Identifier:
22279842
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2012; Journal Issue: 07; 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; ANNIHILATION; ANTIPARTICLES; ASTROPHYSICS; ASYMMETRY; BARYONS; COSMOLOGY; DEGREES OF FREEDOM; DENSITY; GEV RANGE; NONLUMINOUS MATTER; RELATIVISTIC RANGE; RELICT RADIATION; STANDARD MODEL; UNIVERSE

Citation Formats

Blennow, Mattias, Martinez, Enrique Fernandez, Mena, Olga, Redondo, Javier, and Serra, Paolo, E-mail: Mattias.Blennow@mpi-hd.mpg.de, E-mail: enfmarti@cern.ch, E-mail: omena@ific.uv.es, E-mail: redondo@mppmu.mpg.de, E-mail: serra@astron.nl. Asymmetric Dark Matter and Dark Radiation. United States: N. p., 2012. Web. doi:10.1088/1475-7516/2012/07/022.
Blennow, Mattias, Martinez, Enrique Fernandez, Mena, Olga, Redondo, Javier, & Serra, Paolo, E-mail: Mattias.Blennow@mpi-hd.mpg.de, E-mail: enfmarti@cern.ch, E-mail: omena@ific.uv.es, E-mail: redondo@mppmu.mpg.de, E-mail: serra@astron.nl. Asymmetric Dark Matter and Dark Radiation. United States. doi:10.1088/1475-7516/2012/07/022.
Blennow, Mattias, Martinez, Enrique Fernandez, Mena, Olga, Redondo, Javier, and Serra, Paolo, E-mail: Mattias.Blennow@mpi-hd.mpg.de, E-mail: enfmarti@cern.ch, E-mail: omena@ific.uv.es, E-mail: redondo@mppmu.mpg.de, E-mail: serra@astron.nl. Sun . "Asymmetric Dark Matter and Dark Radiation". United States. doi:10.1088/1475-7516/2012/07/022.
@article{osti_22279842,
title = {Asymmetric Dark Matter and Dark Radiation},
author = {Blennow, Mattias and Martinez, Enrique Fernandez and Mena, Olga and Redondo, Javier and Serra, Paolo, E-mail: Mattias.Blennow@mpi-hd.mpg.de, E-mail: enfmarti@cern.ch, E-mail: omena@ific.uv.es, E-mail: redondo@mppmu.mpg.de, E-mail: serra@astron.nl},
abstractNote = {Asymmetric Dark Matter (ADM) models invoke a particle-antiparticle asymmetry, similar to the one observed in the Baryon sector, to account for the Dark Matter (DM) abundance. Both asymmetries are usually generated by the same mechanism and generally related, thus predicting DM masses around 5 GeV in order to obtain the correct density. The main challenge for successful models is to ensure efficient annihilation of the thermally produced symmetric component of such a light DM candidate without violating constraints from collider or direct searches. A common way to overcome this involves a light mediator, into which DM can efficiently annihilate and which subsequently decays into Standard Model particles. Here we explore the scenario where the light mediator decays instead into lighter degrees of freedom in the dark sector that act as radiation in the early Universe. While this assumption makes indirect DM searches challenging, it leads to signals of extra radiation at BBN and CMB. Under certain conditions, precise measurements of the number of relativistic species, such as those expected from the Planck satellite, can provide information on the structure of the dark sector. We also discuss the constraints of the interactions between DM and Dark Radiation from their imprint in the matter power spectrum.},
doi = {10.1088/1475-7516/2012/07/022},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 07,
volume = 2012,
place = {United States},
year = {2012},
month = {7}
}