Cosmological implications of photon-flux upper limits at ultrahigh energies in scenarios of Planckian-interacting massive particles for dark matter - INSPIRE

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Cosmological implications of photon-flux upper limits at ultrahigh energies in scenarios of Planckian-interacting massive particles for dark matter

Pierre Auger

Collaboration

•

Pedro Abreu
(
- LIP, Lisbon
)

Aug 3, 2022

15 pages

Published in:

Phys.Rev.D 107 (2023) 4, 4

Published: Feb 7, 2023

e-Print:

2208.02353 [astro-ph.HE]

DOI:

10.1103/PhysRevD.107.042002 (publication)

Report number:

FERMILAB-PUB-22-601-AD-PPD-SCD-TD

Experiments:

AUGER

View in:

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Abstract: (APS)

Using the data of the Pierre Auger Observatory, we report on a search for signatures that would be suggestive of super-heavy particles decaying in the Galactic halo. From the lack of signal, we present upper limits for different energy thresholds above

≳ 10^{8} GeV

on the secondary by-product fluxes expected from the decay of the particles. Assuming that the energy density of these super-heavy particles matches that of dark matter observed today, we translate the upper bounds on the particle fluxes into tight constraints on the couplings governing the decay process as a function of the particle mass. Instantons, which are nonperturbative solutions to Yang-Mills equations, can give rise to decay channels otherwise forbidden and transform stable particles into metastable ones. Assuming such instanton-induced decay processes, we derive a bound on the reduced coupling constant of gauge interactions in the dark sector:

α_{X} ≲ 0.09

, for

10^{9} ≲ M_{X} / GeV < 10^{19}

. Conversely, we obtain that, for instance, a reduced coupling constant

α_{X} = 0.09

excludes masses

M_{X} ≳ 3 \times 10^{13} GeV

. In the context of dark matter production from gravitational interactions alone during the reheating epoch, we derive constraints on the parameter space that involves, in addition to

M_{X}

and

α_{X}

, the Hubble rate at the end of inflation, the reheating efficiency, and the nonminimal coupling of the Higgs with curvature.

Note:

15 pages, 8 figures, Accompanying paper of arXiv:2203.08854, accepted for publication in Phys. Rev. D

particle: massive
coupling constant: gauge
interaction: gauge
energy: threshold
galaxy: halo
coupling: Higgs
energy: density
coupling: nonminimal
dark matter: density
observatory

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