Shimmering gravitons in the gamma-ray sky

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F23%3A00574596" target="_blank" >RIV/68378271:_____/23:00574596 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0348535" target="_blank" >https://hdl.handle.net/11104/0348535</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1475-7516/2023/06/019" target="_blank" >10.1088/1475-7516/2023/06/019</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Shimmering gravitons in the gamma-ray sky

Popis výsledku v původním jazyce

What is the highest energy at which gravitons can be observed? We address this question by studying graviton-to-photon conversion - the inverse-Gertsenshtein effect - in the magnetic field of the Milky Way. We find that above ~ 1 PeV the effective photon mass grows large enough to quench the conversion rate. For sub-PeV energies, the induced photon flux is comparable to the sensitivity of LHAASO to a diffuse γ-ray background, but only for graviton abundances of order Ωgw h0^2 ~ 1. In the future, owing to a better understanding of γ-ray backgrounds, larger effective areas and longer observation times, sub-PeV shimmering gravitons with a realistic abundance of Ωgw h0^2 ~ 0.01 could be detected. We show how such a large abundance is achieved in a cosmologically-motivated scenario of post-recombination superheavy dark matter decay. Therefore, the sub-PeV range might be the ultimate energy frontier at which gravitons can be observed.

Název v anglickém jazyce

Shimmering gravitons in the gamma-ray sky

Popis výsledku anglicky

What is the highest energy at which gravitons can be observed? We address this question by studying graviton-to-photon conversion - the inverse-Gertsenshtein effect - in the magnetic field of the Milky Way. We find that above ~ 1 PeV the effective photon mass grows large enough to quench the conversion rate. For sub-PeV energies, the induced photon flux is comparable to the sensitivity of LHAASO to a diffuse γ-ray background, but only for graviton abundances of order Ωgw h0^2 ~ 1. In the future, owing to a better understanding of γ-ray backgrounds, larger effective areas and longer observation times, sub-PeV shimmering gravitons with a realistic abundance of Ωgw h0^2 ~ 0.01 could be detected. We show how such a large abundance is achieved in a cosmologically-motivated scenario of post-recombination superheavy dark matter decay. Therefore, the sub-PeV range might be the ultimate energy frontier at which gravitons can be observed.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Cosmology and Astroparticle Physics

ISSN

1475-7516

e-ISSN

1475-7516

Svazek periodika

2023

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

14

Strana od-do

019

Kód UT WoS článku

001025516000006

EID výsledku v databázi Scopus

2-s2.0-85162267990