Nonlocal effects from boosted dark matter in indirect detection

Agashe, Kaustubh; Clark, Steven J.; Dutta, Bhaskar; Tsai, Yuhsin

doi:10.1103/physrevd.103.083006

Title: Nonlocal effects from boosted dark matter in indirect detection

Journal Article · Wed Apr 07 00:00:00 EDT 2021 · Physical Review. D.

DOI:https://doi.org/10.1103/physrevd.103.083006· OSTI ID:1851447

Agashe, Kaustubh ^[1]; Clark, Steven J. ^[2]; Dutta, Bhaskar ^[3];

^[1]

Univ. of Maryland, College Park, MD (United States)
Brown Univ., Providence, RI (United States)
Texas A & M Univ., College Station, TX (United States)

Here, indirect dark matter (DM) detection typically involves the observation of standard model (SM) particles emerging from DM annihilation/decay inside regions of high dark matter concentration. We consider an annihilation scenario in which this reaction has to be initiated by one of the DMs involved being boosted while the other is an ambient nonrelativistic particle. This “trigger” DM must be created, for example, in a previous annihilation or decay of a heavier component of DM. Remarkably, boosted DM annihilating into gamma rays at a specific point in a galaxy could actually have traveled from its source at another point in the same galaxy or even from another galaxy. Such a “nonlocal” behavior leads to a nontrivial dependence of the resulting photon signal on the galactic halo parameters, such as DM density and core size, encoded in the so-called “astrophysical” J-factor. These nonlocal J-factors are strikingly different than the usual scenario. A distinctive aspect of this model is that the signal from dwarf galaxies relative to the Milky Way tends to be suppressed from the typical value to various degrees depending on their characteristics. This feature can thus potentially alleviate the mild tension between the DM annihilation explanation of the observed excess of approximately GeV photons from the Milky Way’s Galactic Center vs the apparent nonobservation of the corresponding signal from dwarf galaxies.

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Research Organization:: Texas A & M Univ., College Station, TX (United States); Brown Univ., Providence, RI (United States); Univ. of Maryland, College Park, MD (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF); Fermilab Distinguished Scholars Program; Maryland Center for Fundamental Physics; Brown Theoretical Physics Center; US-Israeli BSF Grant

Grant/Contract Number:: SC0010813; PHY-1620074; PHY-1914731; 2018236; PHY-1607611

OSTI ID:: 1851447

Report Number(s):: UMD-PP-020-1; MI-TH-2016; TRN: US2304090

Journal Information:: Physical Review. D., Vol. 103, Issue 8; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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