Cherenkov Telescope Array sensitivity to branon dark matter models

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F20%3A00539649" target="_blank" >RIV/68378271:_____/20:00539649 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1088/1475-7516/2020/10/041" target="_blank" >https://doi.org/10.1088/1475-7516/2020/10/041</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1475-7516/2020/10/041" target="_blank" >10.1088/1475-7516/2020/10/041</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Cherenkov Telescope Array sensitivity to branon dark matter models

Popis výsledku v původním jazyce

In the absence of a clear hint of dark matter (DM) signals in the GeV regime so far, heavy, O(TeV) DM candidates are gradually earning more and more attention within the community. Among others, extra-dimensional brane-world models may produce thermal DM candidates with masses up to 100 TeV. These heavy DM candidates could be detected with the next generation of very-high-energy gamma-ray observatories such as the Cherenkov Telescope Array (CTA). In this work, we study the sensitivity of CTA to branon DM via the observation of representative astrophysical DM targets, namely dwarf spheroidal galaxies. In particular, we focus on Draco and Sculptor, two well-known dwarfs visible from the Northern and Southern Hemisphere, respectively. For each of these targets, we simulated 300 h of CTA observations and studied the sensitivity of both CTA-North and CTA-South to branon annihilations using the latest publicly available instrument response functions and most recent analysis tools. We computed annihilation cross section values needed to reach a 5a detection as a function of the branon mass. Additionally, in the absence of a predicted DM signal, we obtained 2a upper limits on the annihilation cross section. These limits lie 1.5-2 orders of magnitude above the thermal relic cross section value, depending on the considered branon mass. Yet, CTA will allow to exclude a significant portion of the brane tension-mass parameter space in the 0.1-60 TeV branon mass range, and up to tensions of similar to 10 TeV. More importantly, CTA will significantly enlarge the region already excluded by AMS and CMS, and will provide valuable complementary information to future SKA radio observations. We conclude that CTA will possess potential to constrain brane-world models and, more in general, TeV DM candidates.

Název v anglickém jazyce

Cherenkov Telescope Array sensitivity to branon dark matter models

Popis výsledku anglicky

In the absence of a clear hint of dark matter (DM) signals in the GeV regime so far, heavy, O(TeV) DM candidates are gradually earning more and more attention within the community. Among others, extra-dimensional brane-world models may produce thermal DM candidates with masses up to 100 TeV. These heavy DM candidates could be detected with the next generation of very-high-energy gamma-ray observatories such as the Cherenkov Telescope Array (CTA). In this work, we study the sensitivity of CTA to branon DM via the observation of representative astrophysical DM targets, namely dwarf spheroidal galaxies. In particular, we focus on Draco and Sculptor, two well-known dwarfs visible from the Northern and Southern Hemisphere, respectively. For each of these targets, we simulated 300 h of CTA observations and studied the sensitivity of both CTA-North and CTA-South to branon annihilations using the latest publicly available instrument response functions and most recent analysis tools. We computed annihilation cross section values needed to reach a 5a detection as a function of the branon mass. Additionally, in the absence of a predicted DM signal, we obtained 2a upper limits on the annihilation cross section. These limits lie 1.5-2 orders of magnitude above the thermal relic cross section value, depending on the considered branon mass. Yet, CTA will allow to exclude a significant portion of the brane tension-mass parameter space in the 0.1-60 TeV branon mass range, and up to tensions of similar to 10 TeV. More importantly, CTA will significantly enlarge the region already excluded by AMS and CMS, and will provide valuable complementary information to future SKA radio observations. We conclude that CTA will possess potential to constrain brane-world models and, more in general, TeV DM candidates.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

—

Návaznosti

—

Rok uplatnění

2020

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

—

Svazek periodika

2020

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

19

Strana od-do

1-19

Kód UT WoS článku

000590148200043

EID výsledku v databázi Scopus

2-s2.0-85094188659