Signatures of clumpy dark matter in the global 21 cm background signal

Journal Article · Mon Nov 15 00:00:00 EST 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.82.103508· OSTI ID:21509911

Cumberbatch, Daniel T; Lattanzi, Massimiliano; Silk, Joseph ^[1]

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1. Astroparticle Theory and Cosmology Group, Department of Physics and Astronomy, University of Sheffield, Hicks Building, Hounsfield Road, Sheffield, S3 7RH (United Kingdom)

We examine the extent to which the self-annihilation of supersymmetric neutralino dark matter, as well as light dark matter, influences the rate of heating, ionization, and Lyman-{alpha} pumping of interstellar hydrogen and helium and the extent to which this is manifested in the 21 cm global background signal. We fully consider the enhancements to the annihilation rate from dark matter halos and substructures within them. We find that the influence of such structures can result in significant changes in the differential brightness temperature, {delta}T{sub b}. The changes at redshifts z<25 are likely to be undetectable due to the presence of the astrophysical signal; however, in the most favorable cases, deviations in {delta}T{sub b}, relative to its value in the absence of self-annihilating dark matter, of up to {approx_equal}20 mK at z=30 can occur. Thus we conclude that, in order to exclude these models, experiments measuring the global 21 cm signal, such as EDGES and CORE, will need to reduce the systematics at 50 MHz to below 20 mK.

• OSTI ID: 21509911
• Journal Information: Physical Review. D, Particles Fields, Vol. 82, Issue 10; Other Information: DOI: 10.1103/PhysRevD.82.103508; (c) 2010 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
ASTROPHYSICS
BRIGHTNESS
HEAT RATE
HELIUM
HYDROGEN
INTERSTELLAR SPACE
IONIZATION
LYMAN LINES
MHZ RANGE
NONLUMINOUS MATTER
RADIOWAVE RADIATION
RED SHIFT
SUPERSYMMETRY
TEMPERATURE RANGE 0000-0013 K
EFFICIENCY
ELECTROMAGNETIC RADIATION
ELEMENTS
FLUIDS
FREQUENCY RANGE
GASES
INTERACTIONS
MATTER
NONMETALS
OPTICAL PROPERTIES
PARTICLE INTERACTIONS
PHYSICAL PROPERTIES
PHYSICS
RADIATIONS
RARE GASES
SPACE
SYMMETRY
TEMPERATURE RANGE