Intergalactic γ-ray propagation: basic ideas, processes, and constraints

Dzhatdoev, T.; Khalikov, E.; Podlesnyi, E. I.; Telegina, Anastasia

doi:10.1088/1742-6596/1181/1/012049

Cited by 6 publications

(3 citation statements)

References 55 publications

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“…The result obtained is seemingly valid also for purely electromagnetic cascades, as was discussed in [29].…”

Section: Discussionsupporting

confidence: 71%

Influence of Extragalactic Magnetic Fields on Extragalactic Cascade Gamma-Ray Emission

Uryson¹

2022

Universe

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We discuss the influence of extragalactic magnetic fields on the intensity of gamma-ray emission produced in electromagnetic cascades from ultra-high energy cosmic rays propagating in extragalactic space. Both cosmic rays and cascade particles propagate mostly out of galaxies, galactic clusters, and large-scale structures, as their relative volume is small. Therefore, their magnetic fields weakly affect emission produced in cascades. Yet, estimates of this influence can be useful in searching for dark matter particles when components of extragalactic gamma-ray background should be known, including cascade gamma-ray emission. To study magnetic field influence on cascade emission, we calculated cosmic particle propagation in fields of ~10−6 and 10−12 G (the former is typical inside galaxies and clusters and the latter is common in voids and outside galaxies and clusters). The calculated spectra of cascade gamma-ray emissions are similar in the range of ~107–109 eV, so analyzing cascade emission in this range it is not necessary to specify models of an extragalactic magnetic field.

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“…The result obtained is seemingly valid also for purely electromagnetic cascades, as was discussed in [29].…”

Section: Discussionsupporting

confidence: 71%

Influence of Extragalactic Magnetic Fields on Extragalactic Cascade Gamma-Ray Emission

Uryson¹

2022

Universe

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“…[16]). The dependence of L E−e on the electron energy E e for z = 0 was presented in [49] in Fig. 2 (left); this figure was produced assuming the approximation for the IC process obtained in [50].…”

Section: Simulation Of Pair Echo From Grb 190114cmentioning

confidence: 99%

Can we constrain the extragalactic magnetic field from very high energy observations of GRB 190114C?

Dzhatdoev,

Podlesnyi,

Vaiman

2020

Preprint

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Primary very high energy γ-rays from γ-ray bursts (GRBs) are partially absorbed on extragalactic background light (EBL) photons with subsequent formation of intergalactic electromagnetic cascades. Characteristics of the observable cascade γ-ray signal are sensitive to the strength and structure of the extragalactic magnetic field (EGMF). GRB 190114C was recently detected with the MAGIC imaging atmospheric Cherenkov telescopes, for the first time allowing to estimate the observable cascade intensity. We inquire whether any constraints on the EGMF strength and structure could be obtained from publicly-available γ-ray data on GRB 190114C. We present detailed calculations of the observable cascade signal for various EGMF configurations. We show that the sensitivity of the Fermi-LAT space γ-ray telescope is not sufficient to obtain such constraints on the EGMF parameters. However, next-generation space γ-ray observatories such as MAST would be able to detect pair echoes from GRBs similar to GRB 190114C for the EGMF strength below 10 −17 − 10 −18 G.

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“…This has led to different theories in quantum gravity (QG) as well as various cosmological models beyond ΛCDM [7][8][9][10][11][12][13][14][15][16][17][18]. At energies close to the Planck energy scale, E P ∼ 1.2 × 10 19 GeV, some of the fundamental concepts in physics such as Lorentz symmetry can be broken as predicted by various QG theories [5,[19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Such very large energies are unreachable by currently available facilities and instrumentation.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Lorentz invariance violation effect using different cosmological backgrounds

Abdalla,

Cotter,

Backes

et al. 2023

Class. Quantum Grav.

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Familiar concepts in physics, such as Lorentz symmetry, are expected to be broken at energies approaching the Planck energy scale as predicted by several quantum-gravity theories. However, such very large energies are unreachable by current experiments on Earth. Current and future Cherenkov telescope facilities may have the capability to measure the accumulated deformation from Lorentz symmetry for photons traveling over large distances via energy-dependent time delays. One of the best natural laboratories to test Lorentz invariance violation (LIV) signatures are gamma-ray bursts. The calculation of time delays due to the LIV effect depends on the cosmic expansion history. In most of the previous works calculating time lags due to the LIV effect, the standard ΛCDM (or concordance) cosmological model is assumed. In this paper, we investigate whether the LIV signature is significantly different when assuming alternatives to the ΛCDM cosmological model. Specifically, we consider cosmological models with a non-trivial dark-energy equation of state (EoS) (w≠−1), such as the standard Chevallier–Polarski–Linder parameterization, the quadratic parameterization of the dark-energy EoS, and the Pade parameterizations. We find that the relative difference in the predicted time lags is small, of the order of at most a few percent, and thus likely smaller than the systematic errors of possible measurements currently or in the near future.

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Intergalactic γ-ray propagation: basic ideas, processes, and constraints

Cited by 6 publications

References 55 publications

Influence of Extragalactic Magnetic Fields on Extragalactic Cascade Gamma-Ray Emission

Influence of Extragalactic Magnetic Fields on Extragalactic Cascade Gamma-Ray Emission

Can we constrain the extragalactic magnetic field from very high energy observations of GRB 190114C?

Investigating the Lorentz invariance violation effect using different cosmological backgrounds

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