Dark matter halos and the anisotropy of ultra-high energy cosmic rays in the Pierre Auger observatory

Siffert, B. B.; Lazarotto, B.; Neto, J. R. T. de Mello; Olinto, Angela V.

doi:10.1590/s0103-97332007000100016

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…(1). Previous related searches have been conducted using much more modest datasets [52][53][54][55][56][57]. The high-energy thresholds considered here, namely from 10 10.5 GeV to 10 10.9 GeV, allow us to minimize the uncertainties inherent in the modeling of the Galactic magnetic field bending the (anti-)proton trajectories.…”

Section: A Prediction Of the Fluxes Of Secondariesmentioning

confidence: 99%

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

Collaboration¹,

Abreu²,

Aglietta³

et al. 2023

Phys. Rev. D

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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 ¼ 0.09 excludes masses M X ≳ 3 × 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.

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Section: A Prediction Of the Fluxes Of Secondariesmentioning

confidence: 99%

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

Collaboration¹,

Abreu²,

Aglietta³

et al. 2023

Phys. Rev. D

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“…This data set, the largest available at such energies, is used to search for a component of UHECRs following the arrival direction pattern predicted by Equation (1). Previous related searches have been conducted using much more modest data sets [47][48][49][50][51][52]. The high energy thresholds considered here, namely from 10 10.5 GeV to 10 10.9 GeV, allow us to minimize the uncertainties inherent in the modelling of the Galactic magnetic field bending the (anti-)proton trajectories.…”

Section: B Search For Shdm Secondaries In Data Of the Observatorymentioning

confidence: 99%

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

Abreu,

Aglietta,

Albury

et al. 2022

Preprint

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We present a thorough search for signatures that would be suggestive of super-heavy X particles decaying in the Galactic halo, in the data of the Pierre Auger Observatory. From the lack of signal, we derive upper limits for different energy thresholds above 10 8 GeV on the expected secondary by-product fluxes from X-particle decay. 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. We show that instanton-induced decay processes allow us to 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 . This upper limit on α X is complementary to the non-observation of tensor modes in the cosmic microwave background in the context of Planckian-interacting massive particles for dark matter produced during the reheating epoch. Viable regions for this scenario to explain dark matter are delineated in several planes of the multidimensional 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 non-minimal coupling of the Higgs with curvature.

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“…The detection of even higher-energy photons would be of considerable interest in discovering extreme accelerators in the Galaxy. Also, should one detect photons of such energies clustered preferentially in the direction of the Galactic center, then this could highlight the presence of super-heavy dark matter (SHDM) produced in the early universe and decaying today (see, e.g., Benson et al 1999;Berezinsky & Mikhailov 1999;Medina-Tanco & Watson 1999;Aloisio et al 2006;Siffert et al 2007;Kalashev & Kuznetsov 2016;Alcantara et al 2019).…”

Section: Introductionmentioning

confidence: 99%

A Search for Photons with Energies Above 2 × 10¹⁷ eV Using Hybrid Data from the Low-Energy Extensions of the Pierre Auger Observatory

Abreu

Aglietta

Albury

et al. 2022

ApJ

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Ultra-high-energy photons with energies exceeding 1017 eV offer a wealth of connections to different aspects of cosmic-ray astrophysics as well as to gamma-ray and neutrino astronomy. The recent observations of photons with energies in the 1015 eV range further motivate searches for even higher-energy photons. In this paper, we present a search for photons with energies exceeding 2 × 1017 eV using about 5.5 yr of hybrid data from the low-energy extensions of the Pierre Auger Observatory. The upper limits on the integral photon flux derived here are the most stringent ones to date in the energy region between 1017 and 1018 eV.

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Dark matter halos and the anisotropy of ultra-high energy cosmic rays in the Pierre Auger observatory

Cited by 5 publications

References 9 publications

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

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

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

A Search for Photons with Energies Above 2 × 10¹⁷ eV Using Hybrid Data from the Low-Energy Extensions of the Pierre Auger Observatory

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Dark matter halos and the anisotropy of ultra-high energy cosmic rays in the Pierre Auger observatory

Cited by 5 publications

References 9 publications

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

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

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

A Search for Photons with Energies Above 2 × 1017 eV Using Hybrid Data from the Low-Energy Extensions of the Pierre Auger Observatory

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A Search for Photons with Energies Above 2 × 10¹⁷ eV Using Hybrid Data from the Low-Energy Extensions of the Pierre Auger Observatory