Search Publications
Interacting dark matter contribution to the galactic 511 keV gamma ray emission: constraining the morphology with INTEGRAL/SPI observations
Martin, Pierrick; Vincent, Aaron C.; Cline, James M.
We compare the full-sky morphology of the 511 keV gamma ray excess measured by the INTEGRAL/SPI experiment to predictions of models based on dark matter (DM) scatterings that produce low-energy positrons: either MeV-scale DM that annihilates directly into e+e- pairs, or heavy DM that inelastically scatters into an excited sta…
The rates and time-delay distribution of multiply imaged supernovae behind lensing clusters
Richard, Johan; Hjorth, Jens; Li, Xue
Time delays of gravitationally lensed sources can be used to constrain the mass model of a deflector and determine cosmological parameters. We here present an analysis of the time-delay distribution of multiply imaged sources behind 17 strong lensing galaxy clusters with well-calibrated mass models. We find that for time delays less than 1000 days…
PAMELA, DAMA, INTEGRAL and signatures of metastable excited WIMPs
Finkbeiner, Douglas P.; Slatyer, Tracy R.; Weiner, Neal +1 more
Models of dark matter with ~ GeV scale force mediators provide attractive explanations of many high energy anomalies, including PAMELA, ATIC, and the WMAP haze. At the same time, by exploiting the ~ MeV scale excited states that are automatically present in such theories, these models naturally explain the DAMA/LIBRA and INTEGRAL signals through t…
A feasibility study for measuring geomagnetic conversion of solar axions to x-rays in low Earth orbits
Davoudiasl, Hooman; Huber, Patrick
We present a detailed computation of the expected rate for geomagnetic conversion of solar axions to x-rays (GECOSAX) along the orbit of an x-ray satellite. We use realistic satellite orbits and propagation in time. A realistic model for the Earth's magnetic field, which properly accounts for its spatial non-uniformity, is used. We also account fo…
Exploring the properties of dark energy using type-Ia supernovae and other datasets
Starobinsky, Alexei A.; Alam, Ujjaini; Sahni, Varun
We reconstruct dark energy properties from two complementary supernova datasets—the newly released Gold + HST sample and SNLS. The results obtained are consistent with the standard ΛCDM model within 2σ error bars, although the Gold + HST data favour evolving dark energy slightly more than SNLS. Using complementary data from baryon acoustic oscilla…
The XMM-LSS survey. Survey design and first results
Refregier, Alexandre; Gandhi, Poshak; Mellier, Yannick +36 more
The XMM Large Scale Structure survey (XMM-LSS) is a medium deep large area X-ray survey. Its goal is to extend large scale structure investigations attempted using ROSAT cluster samples to two redshift bins between 0<z<1 while maintaining the precision of earlier studies. Two main goals have constrained the survey design: the evolutionary st…