FERMI CONSTRAINS DARK-MATTER ORIGIN OF HIGH-ENERGY POSITRON ANOMALY

Tensor Detection Severely Constrains Axion Dark Matter

High-energy neutrino signatures of dark matter

Matthew R. Buckley, Douglas Spolyar, Katherine Freese, Dan Hooper, and Hitoshi Murayama Department of Physics, California Institute of Technology, Pasadena, California 91125, USA Center for Particle Astrophysics, Fermi National Accelerator Laboratory, Batavia, Illinois 60510 USA University of California, Santa Cruz, Physics Department, Santa Cruz, California 95064 USA Michigan Center for Theore...

R-violating Decay of Wino Dark Matter and electron/positron Excesses in the PAMELA/Fermi Experiments

We show that R-parity violating decay of Wino dark matter of mass ∼ 3 TeV can naturally account for the flux and spectral shape of the cosmic-ray electrons and positrons observed by the PAMELA and Fermi satellites. To provide a theoretical basis for the scenario, we also present a model that trilinear R-parity breaking appears with a coefficient suppressed by powers of the gravitino mass, which...

Dark Matter and Dark Energy

I briefly review our current understanding of dark matter and dark energy. The first part of this paper focusses on issues pertaining to dark matter including observational evidence for its existence, current constraints and the ‘abundance of substructure’ and ‘cuspy core’ issues which arise in CDM. I also briefly describe MOND. The second part of this review focusses on dark energy. In this pa...

The Positron Excess and Supersymmetric Dark Matter∗

Using a new instrument, the HEAT collaboration has confirmed the excess of cosmic ray positrons that they first detected in 1994. We explore the possibility that this excess is due to the annihilation of neutralino dark matter in the galactic halo. We confirm that neutralino annihilation can produce enough positrons to make up the measured excess only if there is an additional enhancement to th...