Particle Velocity Effects in the Anisotropy of Extragalactic Diffuse Gamma-rays from Dark Matter Annihilation Sheldon Campbell, Texas A&M University Continuation.

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Presentation transcript:

Particle Velocity Effects in the Anisotropy of Extragalactic Diffuse Gamma-rays from Dark Matter Annihilation Sheldon Campbell, Texas A&M University Continuation of work done with Bhaskar Dutta and Eiichiro Komatsu Phys. Rev. D 82, (2010) 2011 Phenomenology Symposium University of Wisconsin at Madison May 9, 2011

In this talk… I will present brand new results on the p-wave annihilation's effect on extragalactic dark matter signals. 1.Statistical description of large scale structure. 2.Review the p-wave effects on the mean intensity spectrum of the annihilation gamma-rays. 3.Present p-wave effects on the angular power spectrum of the signal. 2Sheldon Campbell, Texas A&M UniversityPheno 2011, May 9

Distribution of Dark Matter Detailed information from simulations. Dark Matter collapses into halos. The dominant contribution to annihilation is from the densest core regions of halos. For annihilation signals, we can model dark matter as an ensemble of halos. These simulations indicate that halos have universal properties: spherically-averaged density profiles, velocity variance profiles.

The Spherical Halo Model Pheno 2011, May 9Sheldon Campbell, Texas A&M University4 Simulations show the densest regions of dark matter are well described by an ensemble of disjoint, spherical halos with universal profiles. Same mean density and power spectrum!

Cosmic Mean Velocity Variance Pheno 2011, May 9Sheldon Campbell, Texas A&M University5 Particle motions are virial (not thermal), within self-gravitating systems.

Calculating  -ray intensity: What does particle physics contribute? 6

Annihilation Cross Section with p-wave Pheno 2011, May 9Sheldon Campbell, Texas A&M University7

I'll present results for 5 different models for comparison. Pheno 2011, May 9Sheldon Campbell, Texas A&M University8

Mean Intensity of Extragalactic Annihilation Photons Pheno 2011, May 9Sheldon Campbell, Texas A&M University9

Angular Power Spectrum Pheno 2011, May 9Sheldon Campbell, Texas A&M University10

Pheno 2011, May 9Sheldon Campbell, Texas A&M University11

Pheno 2011, May 9Sheldon Campbell, Texas A&M University12

Summary Pheno 2011, May 9Sheldon Campbell, Texas A&M University13

The Gamma-Ray Spectrum from Fermi Here, the observed gamma-ray sky is well described by models of emissions by supernova remnants (SNRs) and pulsar wine nebulae (PWNs). Included are the catalog of point sources (1FGL). Diffuse extragalactic gamma-rays contribute to the isotropic component. This model makes a prediction for the gamma-ray anisotropy. These sources also have consequences for the cosmic ray observations. arXiv: