Protohalo Constraints to the Resonant Annihilation of Dark Matter Export

@article{citeulike:4698419, abstract = {It has recently been argued that the PAMELA, ATIC and PPB-BETS data showing an anomalous excess of high-energy cosmic ray positrons and electrons might be explained by dark matter annihilating in the Galactic halo with a cross section resonantly enhanced compared to its value in the primeval plasma. We find that with a very large annihilation cross section the flash of energetic photons and electron-positron pairs expected from dark-matter annihilation in the first protohalos that form at redshift z\~{}40 is likely substantial and observable. As a consequence, bounds on the allowed energy injection into the primordial gas and the energy density of the diffuse gamma-ray background give rise to limits on the low-velocity dark matter cross section that can be difficult to reconcile with this interpretation of the PAMELA, ATIC and PPB-BETS results.}, archivePrefix = {arXiv}, author = {Cyr-Racine, Francis-Yan and Profumo, Stefano and Sigurdson, Kris}, citeulike-article-id = {4698419}, citeulike-linkout-0 = {http://arxiv.org/abs/0904.3933}, citeulike-linkout-1 = {http://arxiv.org/pdf/0904.3933}, day = {28}, eprint = {0904.3933}, keywords = {darkmatter, gamma-ray-background, pamela}, month = {May}, posted-at = {2009-06-01 09:20:58}, priority = {2}, title = {Protohalo Constraints to the Resonant Annihilation of Dark Matter}, url = {http://arxiv.org/abs/0904.3933}, year = {2009} }

TY - JOUR ID - citeulike:4698419 L3 - citeulike-article-id:4698419 N2 - It has recently been argued that the PAMELA, ATIC and PPB-BETS data showing an anomalous excess of high-energy cosmic ray positrons and electrons might be explained by dark matter annihilating in the Galactic halo with a cross section resonantly enhanced compared to its value in the primeval plasma. We find that with a very large annihilation cross section the flash of energetic photons and electron-positron pairs expected from dark-matter annihilation in the first protohalos that form at redshift z~40 is likely substantial and observable. As a consequence, bounds on the allowed energy injection into the primordial gas and the energy density of the diffuse gamma-ray background give rise to limits on the low-velocity dark matter cross section that can be difficult to reconcile with this interpretation of the PAMELA, ATIC and PPB-BETS results. TI - Protohalo Constraints to the Resonant Annihilation of Dark Matter KW - darkmatter KW - gamma-ray-background KW - pamela AU - Cyr-Racine, Francis-Yan AU - Profumo, Stefano AU - Sigurdson, Kris PY - 2009/May/28/ UR - http://arxiv.org/abs/0904.3933 ER -