Limits on threshold and "Sommerfeld" enhancements in dark matter annihilation

被引：11

作者：

Backovic, Mihailo ^{[1
]}

Ralston, John P. ^{[1
]}

机构：

[1] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA

来源：

PHYSICAL REVIEW D | 2010年 / 81卷 / 05期

关键词：

ELECTRONS; ENERGIES;

D O I：

10.1103/PhysRevD.81.056002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We find model-independent upper limits on rates of dark matter annihilation in galactic halos. The Born approximation generally fails, while exotic threshold enhancements akin to "Sommerfeld factors" also turn out to be baseless. The most efficient annihilation mechanism involves perturbatively small decay widths that have largely been ignored. Widths that are very small compared to TeV mass scales suffice to cause large enhancements in the velocity averaged cross sections. Bound state formation in weakly coupled theories produces small effects due to wave function normalizations. Unitarity shows the Sommerfeld factor cannot produce large enhancements of cross sections, and serves to identify where those approximations break down.

引用

页数：8

共 42 条

[1] CALCULATION OF THE 2-PHOTON-ANNIHILATION CONTRIBUTION TO THE POSITRONIUM HYPERFINE INTERVAL AT ORDER-MA(6) [J].

ADKINS, GS ;

AKSU, YM ;

BUI, MHT .

PHYSICAL REVIEW A, 1993, 47 (04) :2640-2652

[2] An anomalous positron abundance in cosmic rays with energies 1.5-100 GeV [J].

Adriani, O. ;

Barbarino, G. C. ;

Bazilevskaya, G. A. ;

Bellotti, R. ;

Boezio, M. ;

Bogomolov, E. A. ;

Bonechi, L. ;

Bongi, M. ;

Bonvicini, V. ;

Bottai, S. ;

Bruno, A. ;

Cafagna, F. ;

Campana, D. ;

Carlson, P. ;

Casolino, M. ;

Castellini, G. ;

De Pascale, M. P. ;

De Rosa, G. ;

De Simone, N. ;

Di Felice, V. ;

Galper, A. M. ;

Grishantseva, L. ;

Hofverberg, P. ;

Koldashov, S. V. ;

Krutkov, S. Y. ;

Kvashnin, A. N. ;

Leonov, A. ;

Malvezzi, V. ;

Marcelli, L. ;

Menn, W. ;

Mikhailov, V. V. ;

Mocchiutti, E. ;

Orsi, S. ;

Osteria, G. ;

Papini, P. ;

Pearce, M. ;

Picozza, P. ;

Ricci, M. ;

Ricciarini, S. B. ;

Simon, M. ;

Sparvoli, R. ;

Spillantini, P. ;

Stozhkov, Y. I. ;

Vacchi, A. ;

Vannuccini, E. ;

Vasilyev, G. ;

Voronov, S. A. ;

Yurkin, Y. T. ;

Zampa, G. ;

Zampa, N. .

NATURE, 2009, 458 (7238) :607-609

[3] Supersymmetric B-L dark matter model and the observed anomalies in the cosmic rays [J].

Allahverdi, Rouzbeh ;

Dutta, Bhaskar ;

Richardson-McDaniel, Katherine ;

Santoso, Yudi .

PHYSICAL REVIEW D, 2009, 79 (07)

[4] Anomalous positron excess from Lorentz-violating QED [J].

Andrianov, Alexander A. ;

Espriu, Domenec ;

Giacconi, Paola ;

Soldati, Roberto .

JOURNAL OF HIGH ENERGY PHYSICS, 2009, (09)

[5]

[Anonymous], ARXIV09030317

[6] A theory of dark matter [J].

Arkani-Hamed, Nima ;

Finkbeiner, Douglas P. ;

Slatyer, Tracy R. ;

Weiner, Neal .

PHYSICAL REVIEW D, 2009, 79 (01)

[7] Pre-launch estimates for GLAST sensitivity to dark matter annihilation signals [J].

Baltz, E. A. ;

Berenji, B. ;

Bertone, G. ;

Bergstrom, L. ;

Bloom, E. ;

Bringmann, T. ;

Chiang, J. ;

Cohen-Tanugi, J. ;

Conrad, J. ;

Edmonds, Y. ;

Edsjoe, J. ;

Godfrey, G. ;

Hughes, R. E. ;

Johnson, R. P. ;

Lionetto, A. ;

Moiseev, A. A. ;

Morselli, A. ;

Moskalenko, I. V. ;

Nuss, E. ;

Ormes, J. F. ;

Rando, R. ;

Sander, A. J. ;

Sellerholm, A. ;

Smith, P. D. ;

Strong, A. W. ;

Wai, L. ;

Wang, P. ;

Winer, B. L. .

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2008, (07)

[8] Dark matter and pulsar signals for Fermi LAT, PAMELA, ATIC, HESS and WMAP data [J].

Barger, V. ;

Gao, Y. ;

Keung, W. -Y. ;

Marfatia, D. ;

Shaughnessy, G. .

PHYSICS LETTERS B, 2009, 678 (03) :283-292

[9] Measurements of the cosmic-ray positron fraction from 1 to 50 GeV [J].

Barwick, SW ;

Beatty, JJ ;

Bhattacharyya, A ;

Bower, CR ;

Chaput, CJ ;

Coutu, S ;

deNolfo, GA ;

Knapp, J ;

Lowder, DM ;

McKee, S ;

Muller, D ;

Musser, JA ;

Nutter, SL ;

Schneider, E ;

Swordy, SP ;

Tarle, G ;

Tomasch, AD ;

Torbet, E .

ASTROPHYSICAL JOURNAL, 1997, 482 (02) :L191-L194

[10] Upper bound on the dark matter total annihilation cross section [J].

Beacom, John F. ;

Bell, Nicole F. ;

Mack, Gregory D. .

PHYSICAL REVIEW LETTERS, 2007, 99 (23)

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