TeV Particle Astrophysics 2013

Session

Indirect searches for dark matter

28 Aug 2013, 14:00

Beckman Center of the National Academies of Sciences and Engineering

Conveners

Indirect searches for dark matter

• Carsten Rott (Sungkyunkwan University)
• Tracy Slatyer (MIT)

Indirect searches for dark matter

• Carsten Rott (Sungkyunkwan University)
• Tracy Slatyer (MIT)

77. The VERITAS Dark Matter Program

Benjamin Zitzer

28/08/2013, 14:00

In the cosmological paradigm, cold dark matter (DM) dominates the mass content of the Universe and is present at every scale. Candidates for DM include many extensions of the standard model, with a weakly interacting massive particle (WIMP) in the mass range from 50 GeV to greater than 10 TeV. The self-annihilation of WIMPs in astrophysical regions of high DM density can produce secondary...

78. Constraints on dark matter annihilation and decay in the Milky Way halo

Gabrijela Zaharijas

28/08/2013, 14:20

Constraints on dark matter annihilation and decay in the Milky Way halo Indirect DM searches through gamma rays produced in DM annihilation/decay in the Milky Way halo are promising means to test the WIMP paradigm due to the high DM density in the inner Galaxy and proximity of the target. Propagation of Galactic cosmic rays also produces diffuse gamma rays which represent a major foreground...

79. Dark Matter constraints from Fermi-LAT inner Galaxy measurements

German Gomez Vargas, Miguel SANCHEZ-CONDE

28/08/2013, 14:40

We derive stringent constraints on parameters of generic dark matter candidates in the likely case that the collapse of baryons to the Galactic Center is accompanied by the contraction of the dark matter. By comparing theoretical predictions with the gamma-ray emission observed by the Fermi-LAT from the region around the Galactic Center, we find that for all the annihilation channels studied,...

80. The 135 GeV Fermi Line and MiDM/RayDM at the LHC

Brian Shuve

28/08/2013, 15:00

Abstract: Magnetic and Rayleigh dark matter (MiDM/RayDM) are models describing weak interactions of dark matter with photons through non-renormalizable operators. Such operators motivate the existence of heavier states that couple to dark matter and are also charged under the electroweak interactions. The recent hints of a gamma ray line in the Fermi data suggest that these states may be light...

81. Indirect Search for Light Dark Matter with X-rays

Michael Loewenstein

28/08/2013, 15:20

I summarize the constraints placed on two well-motivated dark matter candidates that produce an X-ray line via radiative decay -- the sterile neutrino and moduli dark matter -- from our dedicated X-ray search for dark matter targeting dwarf spheroidal galaxies, as well as from related investigations. I also anticipate the increase in sensitivity expected to emerge from current and upcoming...

82. Analysis of dark matter and astrophysical interpretations for excess extended gamma ray emission in Galactic center

Nicolas Canac

28/08/2013, 15:40

We place constraints on the dark matter annihilation cross section by analyzing Fermi Gamma Ray Space Telescope data from the galactic center. We arrive at both a conservative limit, including only known sources of gamma ray emission, and a more stringent model dependent limit, which includes a possible unresolved millisecond pulsar (MSP) population. We also study uncertainties introduced by...

83. Indirect WIMP Searches with Super-Kamiokande

Michael Smy

28/08/2013, 16:30

A search for neutrinos from self-annihilation of Weakly Interacting Massive Particle (WIMP) in the Super-Kamiokande data resulted in no significant excess above the expected backgrounds. The derived limits are presented and compared against the results of other searches. Future prospects with large water Cherenkov detectors are discussed.

84. The Effective Theory of Self-Interacting Dark Matter

Mathieu Cliche

28/08/2013, 16:50

We present new results for self-interacting dark matter focusing on applications to Sommerfeld enhancement. We provide the general parameterization of the self interactions in terms of non-relativistic operators and show how these can generate singular potentials. We show how to consistently renormalize such singular potentials and give bounds on the resulting enhancement. This procedure can...

85. Cold dark matter halo concentrations and their implications for substructure annihilation boosts

Miguel Sanchez-Conde

28/08/2013, 17:10

In the standard cosmology, there exists a strong connection between the internal structural properties of dark matter (DM) halos and their formation epochs. Such information can be expressed in terms of a single key parameter known as concentration. We compute the natal halo concentrations that naturally arise in the model by Prada et al. (2012), which links the concentration with the r.m.s....

86. The TeV Cosmic-Ray Anisotropy from Local Dark Matter Annihilation

Patrick Harding

28/08/2013, 17:30

Several experiments have reported regions in the TeV sky with an excess of cosmic rays. I will discuss the consistency of these cosmic-ray excesses with dark matter annihilations in a nearby subhalo. The dark matter explanation of the TeV cosmic-ray excess naturally explains both its spatial and spectral features. I will show that the dark matter annihilation rate needed to produce the excess...

87. Resolving small-scale Dark Matter structures using multi-source Indirect Detection

Kenny Chun Yu Ng

28/08/2013, 17:50

The extragalactic dark matter (DM) annihilation signal depends on the annihilation cross section, $\sigma v$, and the clumping or boost factor, $\langle \delta^{2}(z) \rangle $. The ``clumping factor--$\sigma v$'' degeneracy can however be broken by comparing DM annihilation signals from multiple sources. In particular, one can then constrain the minimum DM halo mass ($\rm M_{ min}$), which...

88. Gamma-ray Probes of Dark Matter Halo Substructure

Sheldon Campbell

28/08/2013, 18:10

Cosmological simulations predict the presence of a significant population of substructure within dark matter halos. Being dark, these structures are very difficult to probe observationally. Gravitational lensing and baryon signatures give us some information, but cannot probe structures of smaller scales. Dark matter annihilation is a very sensitive probe of dark matter structure. I discuss...