Effects of p-wave annihilation on the angular power spectrum of extragalactic gamma-rays from dark matter annihilation

Journal Article · Sat Oct 01 04:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.84.075004· OSTI ID:21607807

Campbell, Sheldon; Dutta, Bhaskar ^[1]

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1. Department of Physics and Astronomy, Texas A and M University, College Station, Texas 77843 (United States)

We present a formalism for estimating the angular power spectrum of extragalactic gamma-rays produced by dark matter annihilating with any general velocity-dependent cross section. The relevant density and velocity distribution of dark matter is modeled as an ensemble of smooth, universal, rigid, disjoint, spherical halos with distribution and universal properties constrained by simulation data. We apply this formalism to theories of dark matter with p-wave annihilation, for which the relative-velocity-weighted annihilation cross section is {sigma}v=a+bv{sup 2}. We determine that this significantly increases the gamma-ray power if b/a > or approx. 10{sup 6}. The effect of p-wave annihilation on the angular power spectrum is very similar for the sample of particle physics models we explored, suggesting that the important effect for a given b/a is largely determined by the cosmic dark matter distribution. If the dark matter relic from strong p-wave theories is thermally produced, the intensities of annihilation gamma-rays are strongly p-wave suppressed, making them difficult to observe. If an angular power spectrum consistent with a strong p wave were to be observed, it would likely indicate nonthermal production of dark matter in the early Universe.

• OSTI ID: 21607807
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 84; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
CONFIGURATION
COSMIC GAMMA SOURCES
COSMIC RAY SOURCES
CROSS SECTIONS
DENSITY
DISTRIBUTION
ELECTROMAGNETIC RADIATION
GAMMA RADIATION
INTERACTIONS
IONIZING RADIATIONS
MATTER
NONLUMINOUS MATTER
P WAVES
PARTIAL WAVES
PARTICLE INTERACTIONS
PARTICLES
PHYSICAL PROPERTIES
RADIATIONS
SIMULATION
SPECTRA
SPHERICAL CONFIGURATION
UNIVERSE
VELOCITY