DPF 2009

Session

Particle Astrophysics and Cosmology II

28 Jul 2009, 14:00

Wayne State University

336. Results from the Cryogenic Dark Matter Search experiment

Dr Oleg Kamaev (University of Minnesota)

28/07/2009, 14:00

Particle Astrophysics and Cosmology

The Cryogenic Dark Matter Search (CDMS) experiment uses low-temperature solid-state detectors to seek Weakly Interacting Massive Particle (WIMP) and has the world's best exclusion limit on the WIMP-nucleon spin-independent cross section. The experiment uses the ionization and athermal phonons from particle interactions to discriminate between candidate (nuclear recoil) and background (electron...

170. The COUPP Dark Matter Search Experiment

Prof. Ilan Levine (Indiana University South Bend)

28/07/2009, 14:20

Particle Astrophysics and Cosmology

The COUPP collaboration* has revived the bubble chamber technique for use in WIMP dark matter search experiments. The first engineering run, which resulted in improved limits on spin-dependent WIMP-proton couplings, were reported in 2008 using a two kg target. Since then improvements including radiopurification efforts, cosmic ray vetos, design and construction of larger scale chambers (4kg,...

418. Indirect Dark Matter Search with VERITAS

Ryan Dickherber (Washington University in St. Louis)

28/07/2009, 14:40

Particle Astrophysics and Cosmology

A leading candidate for astrophysical dark matter (DM) is a massive particle with a mass in the range from 50 GeV to greater than 10 TeV and an interaction cross section on the weak scale. The self-annihilation of such particles in astrophysical regions of high DM density can generate stable secondary particles including very high energy gamma rays with energies up to the DM particle mass....

349. Pulsars and Indirect Signals for Dark Matter

Daniel Phalen (University of Michigan - Ann Arbor)

28/07/2009, 15:00

Particle Astrophysics and Cosmology

Recently there have been many anomalies in the cosmic ray data in the energy range 10 GeV to 1 TeV. In addition, there is the WMAP "Haze" excess in the 22 GHz to 93 GHz frequency range. We propose that pulsars could describe all of these excesses and discuss the relevant astrophysics.

352. Motivations for a New Force in the Dark Sector

Ms Tracy Slatyer (Harvard University)

28/07/2009, 15:20

Particle Astrophysics and Cosmology

A new force in the dark sector, with GeV-scale force carriers, can change the expected properties of SUSY WIMP dark matter in significant ways. The annihilation cross section at low velocities is boosted by a Sommerfeld enhancement, perhaps by 2 or 3 orders of magnitude; the WIMP annihilates to the new force carrier, which immediately decays to light particles, bypassing constraints from...

309. Light Dark Matter annihilation in model independent approach.

Andriy Badin (Wayne State University)

28/07/2009, 15:40

Particle Astrophysics and Cosmology

We examine annihilation of light bosonic Dark Matter into pair of photons in model-independent way. We consider the simplest generic Lagrangian describing such process and then compare results to the available experimental data. We match effective generic lagrangian to results obtained within particular Dark matter models and determine possible constrains onto parameter space of those models.

401. Recent Results from IceCube and AMANDA

Tyce DeYoung (Pennsylvania State University)

28/07/2009, 16:30

Particle Astrophysics and Cosmology

IceCube is a cubic kilometer neutrino telescope under construction at the South Pole, a successor to the first-generation AMANDA telescope. IceCube is now three quarters complete, with completion expected in early 2011, and data taken with the partially built detector already provides a sensitivity surpassing the complete AMANDA-II data set. Results from searches for astrophysical sources of...

407. Leptogenesis and Its Electromagnetic Variant

Boris Kayser (Fermilab)

28/07/2009, 16:55

Particle Astrophysics and Cosmology

We briefly explain how the present baryon-antibaryon asymmetry of the universe could have arisen through leptogenesis, and then discuss a new version of leptogenesis in which CP violation in electromagnetic decays plays the central role.

285. Baryogenesis from the Decays of Exotic Vector-like Squarks

Mr Timothy Cohen (University of Michigan)

28/07/2009, 17:20

Particle Astrophysics and Cosmology

We show that the baryon asymmetry of the universe can be realized via the out-of-equilibrium decays of TeV scale exotic vector-like squarks. Since baryon number and CP violation will occur in the superpotential, this mechanism is relatively insensitive to the structure of supersymmetry breaking. Examination of the cosmology will lead to restrictions on the reheat temperature of the universe...

387. Planck Scale Cosmology and Resummed Quantum Gravity

Dr Bennie Ward (Baylor University)

28/07/2009, 17:40

Particle Astrophysics and Cosmology

We show that, by using amplitude-based resummation techniques for Feynman's formulation of Einstein's theory, we get quantum field theoretic predictions for the UV fixed-point values of the dimensionless gravitational and cosmological constants. Connections to the phenomenological asymptotic safety analysis of Planck scale cosmology by Bonanno and Reuter are discussed.