Enhanced n-body annihilation of dark matter and its indirect signatures
Abstract
We examine the possible indirect signatures of dark matter annihilation processes with a non-standard scaling with the dark matter density, and in particular the case where more than two dark matter particles participate in the annihilation process. We point out that such processes can be strongly enhanced at low velocities without violating unitarity, similar to Sommerfeld enhancement in the standard case of two-body annihilation, potentially leading to visible signals in indirect searches. We study in detail the impact of such multi-body annihilations on the ionization history of the universe and consequently the cosmic microwave background, and find that unlike in the two-body case, the dominant signal can naturally arise from the end of the cosmic dark ages, after the onset of structure formation. We examine the complementary constraints from the Galactic Center, Galactic halo, and galaxy clusters, and outline the circumstances under which each search would give rise to the strongest constraints. We also show that if there is a population of ultra-compact dense dark matter clumps present in the Milky Way with sufficiently steep density profile, then it might be possible to detect point sources illuminated by multi-body annihilation, even if there is no large low-velocity enhancement. Finally, wemore »
- Authors:
-
[2];
[1]
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Center for Theoretical Physics
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Center for Theoretical Physics; Inst. for Advanced Study, Princeton, NJ (United States). School of Natural Sciences
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); Taiwan Top University Strategic Alliance (TUSA); National Science Foundation (NSF); Simons Foundatio
- Contributing Org.:
- Galileo Galilei Institute for Theoretical Physics; Kavli Institute for Theoretical Physics
- OSTI Identifier:
- 1596608
- Report Number(s):
- MIT-CTP-5052
Journal ID: ISSN 1029-8479; arXiv:1810.09455; TRN: US2102892
- Grant/Contract Number:
- SC0013999; SC0012567; PHY-1748958
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of High Energy Physics (Online)
- Additional Journal Information:
- Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2019; Journal Issue: 3; Journal ID: ISSN 1029-8479
- Publisher:
- Springer Berlin
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTRONOMY AND ASTROPHYSICS; dark matter
Citation Formats
Namjoo, Mohammad Hossein, Slatyer, Tracy R., and Wu, Chih-Liang. Enhanced n-body annihilation of dark matter and its indirect signatures. United States: N. p., 2019.
Web. doi:10.1007/JHEP03(2019)077.
Namjoo, Mohammad Hossein, Slatyer, Tracy R., & Wu, Chih-Liang. Enhanced n-body annihilation of dark matter and its indirect signatures. United States. https://doi.org/10.1007/JHEP03(2019)077
Namjoo, Mohammad Hossein, Slatyer, Tracy R., and Wu, Chih-Liang. Wed .
"Enhanced n-body annihilation of dark matter and its indirect signatures". United States. https://doi.org/10.1007/JHEP03(2019)077. https://www.osti.gov/servlets/purl/1596608.
@article{osti_1596608,
title = {Enhanced n-body annihilation of dark matter and its indirect signatures},
author = {Namjoo, Mohammad Hossein and Slatyer, Tracy R. and Wu, Chih-Liang},
abstractNote = {We examine the possible indirect signatures of dark matter annihilation processes with a non-standard scaling with the dark matter density, and in particular the case where more than two dark matter particles participate in the annihilation process. We point out that such processes can be strongly enhanced at low velocities without violating unitarity, similar to Sommerfeld enhancement in the standard case of two-body annihilation, potentially leading to visible signals in indirect searches. We study in detail the impact of such multi-body annihilations on the ionization history of the universe and consequently the cosmic microwave background, and find that unlike in the two-body case, the dominant signal can naturally arise from the end of the cosmic dark ages, after the onset of structure formation. We examine the complementary constraints from the Galactic Center, Galactic halo, and galaxy clusters, and outline the circumstances under which each search would give rise to the strongest constraints. We also show that if there is a population of ultra-compact dense dark matter clumps present in the Milky Way with sufficiently steep density profile, then it might be possible to detect point sources illuminated by multi-body annihilation, even if there is no large low-velocity enhancement. Finally, we provide a case study of a model where 3-body annihilation dominates the freezeout process, and in particular the resonant regime where a large low-velocity enhancement is naturally generated.},
doi = {10.1007/JHEP03(2019)077},
journal = {Journal of High Energy Physics (Online)},
number = 3,
volume = 2019,
place = {United States},
year = {Wed Mar 13 00:00:00 EDT 2019},
month = {Wed Mar 13 00:00:00 EDT 2019}
}
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Tying Dark Matter to Baryons with Self-interactions
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An unidentified line in X-ray spectra of the Andromeda galaxy and Perseus galaxy cluster
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Self-consistent Calculation of the Sommerfeld Enhancement
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- arXiv
Growth of structure seeded by primordial black holes
text, January 2006
- Mack, Katherine J.; Ostriker, Jeremiah P.; Ricotti, Massimo
- arXiv
The Observed Concentration-Mass Relation for Galaxy Clusters
text, January 2007
- Comerford, Julia M.; Natarajan, Priyamvada
- arXiv
Baryonic Features in the Matter Transfer Function
text, January 1997
- Eisenstein, Daniel J.; Hu, Wayne
- arXiv
Survival of Substructure within Dark Matter Haloes
text, January 1997
- Tormen, Giuseppe; Diaferio, Antonaldo; Syer, David
- arXiv
The Spectrum of Diffuse Cosmic Hard X-Rays Measured with HEAO-1
text, January 1999
- Gruber, D. E.; Matteson, J. L.; Peterson, L. E.
- arXiv
Processes with the $t$-channel singularity in the physical region: finite beam sizes make cross sections finite
text, January 1996
- Melnikov, K.; Serbo, V. G.
- arXiv