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We reconsider Sommerfeld-enhanced annihilation of dark matter (DM) into leptons to explain PAMELA and Fermi electron and positron observations, in light of possible new effects from substructure. There is strong tension between getting a…

High Energy Physics - Phenomenology · Physics 2010-12-23 Aaron C Vincent , Wei Xue , James M Cline

In models of dark matter (DM) with Sommerfeld-enhanced annihilation, where the annihilation rate scales as the inverse velocity, N-body simulations of DM structure formation suggest that the local annihilation signal may be dominated by…

High Energy Physics - Phenomenology · Physics 2013-05-30 Tracy R. Slatyer , Natalia Toro , Neal Weiner

Annihilating dark matter (DM) models based on a scalar hidden sector with Higgs portal-like couplings to the Standard Model are considered as a possible explanation for recently observed cosmic ray excesses. Two versions of the model are…

High Energy Physics - Phenomenology · Physics 2015-05-13 Kazunori Kohri , John McDonald , Narendra Sahu

Anomalies in direct and indirect detection have motivated models of dark matter consisting of a multiplet of nearly-degenerate states, coupled by a new GeV-scale interaction. We perform a careful analysis of the thermal freezeout of dark…

High Energy Physics - Phenomenology · Physics 2015-03-17 Douglas P. Finkbeiner , Lisa Goodenough , Tracy R. Slatyer , Mark Vogelsberger , Neal Weiner

The cosmic-ray excess observed by PAMELA in the positron fraction and by FERMI and HESS in the electron + positron flux can be interpreted in terms of DM annihilations or decays into leptonic final states. Final states into tau's or 4mu…

High Energy Physics - Phenomenology · Physics 2010-02-24 Patrick Meade , Michele Papucci , Alessandro Strumia , Tomer Volansky

We propose a comprehensive theory of dark matter that explains the recent proliferation of unexpected observations in high-energy astrophysics. Cosmic ray spectra from ATIC and PAMELA require a WIMP with mass M_chi ~ 500 - 800 GeV that…

High Energy Physics - Phenomenology · Physics 2009-02-26 Nima Arkani-Hamed , Douglas P. Finkbeiner , Tracy R. Slatyer , Neal Weiner

Recent measurements of cosmic ray leptons by PAMELA, ATIC, HESS and Fermi revealed interesting excesses. Many authors suggested particle Dark Matter (DM) annihilations could be at the origin of these effects. In this paper, we critically…

Cosmology and Nongalactic Astrophysics · Physics 2014-11-20 Pierre Brun

Excitation of multicomponent dark matter in the galactic center has been proposed as the source of low-energy positrons that produce the excess 511 keV gamma rays that have been observed by INTEGRAL. Such models have also been promoted to…

High Energy Physics - Phenomenology · Physics 2010-05-28 James M. Cline

In the last few years there has been some interest in WIMP Dark Matter models featuring a velocity dependent cross section through the Sommerfeld enhancement mechanism, which is a nonrelativistic effect due to massive bosons in the dark…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 Steen Hannestad , Thomas Tram

Much attention has been given to dark matter explanations of the PAMELA positron fraction and Fermi electronic excesses. For those theories with a TeV-scale WIMP annihilating through a light force-carrier, the associated Sommerfeld…

High Energy Astrophysical Phenomena · Physics 2014-11-21 Ilias Cholis , Lisa Goodenough

We demonstrate that the Sommerfeld correction to CDM annihilations can be appreciable if even a small component of the dark matter is extremely cold. Subhalo substructure provides such a possibility given that the smallest clumps are…

Astrophysics · Physics 2010-04-30 Massimiliano Lattanzi , Joseph Silk

Numerous experimental anomalies hint at the existence of a dark matter (DM) multiplet chi_i with small mass splittings. We survey the simplest such models which arise from DM in the low representations of a new SU(2) gauge symmetry, whose…

High Energy Physics - Phenomenology · Physics 2009-10-29 Fang Chen , James M. Cline , Andrew R. Frey

Sommerfeld-enhanced dark matter (DM) annihilation through $s$-wave has been widely considered as a consistent explanation for both the observed cosmic-ray (CR) positron excess and the DM thermal relic density. However, as the $s$-wave…

High Energy Physics - Phenomenology · Physics 2021-09-29 Yu-Chen Ding , Yu-Lin Ku , Chun-Cheng Wei , Yu-Feng Zhou

Fermi-LAT has confirmed the excess in cosmic positron fraction observed by PAMELA, which could be explained by dark matter annihilating or decaying in the center of the galaxy. Most existing models postulate that the dark matter annihilates…

High Energy Physics - Phenomenology · Physics 2015-06-05 Hsin-Chia Cheng , Wei-Chih Huang , Ian Low , Gabe Shaughnessy

The first AMS-02 measurement confirms the existence of an excess in the cosmic-ray positron fraction previously reported by the PAMELA and Fermi-LAT experiments. If interpreted in terms of thermal dark matter (DM) annihilation, the AMS-02…

High Energy Physics - Phenomenology · Physics 2013-11-20 Ze-Peng Liu , Yue-Liang Wu , Yu-Feng Zhou

The annihilation cross section of thermal relic dark matter determines both its relic density and indirect detection signals. We determine how large indirect signals may be in scenarios with Sommerfeld-enhanced annihilation, subject to the…

High Energy Physics - Phenomenology · Physics 2015-03-17 Jonathan L. Feng , Manoj Kaplinghat , Hai-Bo Yu

The possibility of explaining the positron and electron excess recently found by the PAMELA and ATIC collaborations in terms of dark matter (DM) annihilation has attracted considerable attention. Models surviving bounds from, e.g,…

Astrophysics · Physics 2010-04-15 Lars Bergstrom , Gianfranco Bertone , Torsten Bringmann , Joakim Edsjo , Marco Taoso

The PAMELA, Fermi and HESS experiments (PFH) have shown anomalous excesses in the cosmic positron and electron fluxes. A very exciting possibility is that those excesses are due to annihilating dark matter (DM). In this paper we calculate…

Cosmology and Nongalactic Astrophysics · Physics 2010-11-02 Gert Huetsi , Andi Hektor , Martti Raidal

In a wino LSP scenario the annihilation cross section of winos gravitationally bound in galaxies can be boosted by a Sommerfeld enhancement factor which arises due to the ladder of exchanged W bosons between the initial states. The boost…

High Energy Physics - Phenomenology · Physics 2013-09-06 Subhendra Mohanty , Soumya Rao , D. P. Roy

Boost factors of dark matter annihilation into antiprotons and electrons/positrons due to the clumpiness of dark matter distribution are studied in detail in this work, taking the Sommerfeld effect into account. It has been thought that the…

High Energy Astrophysical Phenomena · Physics 2009-12-17 Qiang Yuan , Xiao-Jun Bi , Jia Liu , Peng-Fei Yin , Juan Zhang , Shou-Hua Zhu
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