Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagationSerguei Vorobiov
, Samo Stanič
, Christopher Eckner
, R. Adam
, A. Acharyya
, F. Acero
, H. Abe
, H. Abdalla
, Gabrijela Zaharijas
, Marko Zavrtanik
, Danilo Zavrtanik
, Miha Živec
, 2021, izvirni znanstveni članek
Opis: The Cherenkov Telescope Array (CTA), the new-generation ground-based observatory for γ astronomy, provides unique capabilities to address significant open questions in astrophysics, cosmology, and fundamental physics. We study some of the salient areas of γ cosmology that can be explored as part of the Key Science Projects of CTA, through simulated observations of active galactic nuclei (AGN) and of their relativistic jets. Observations of AGN with CTA will enable a measurement of γ absorption on the extragalactic background light with a statistical uncertainty below 15% up to a redshift z=2 and to constrain or detect γ halos up to intergalactic-magnetic-field strengths of at least 0.3 pG . Extragalactic observations with CTA also show promising potential to probe physics beyond the Standard Model. The best limits on Lorentz invariance violation from γ astronomy will be improved by a factor of at least two to three. CTA will also probe the parameter space in which axion-like particles could constitute a significant fraction, if not all, of dark matter. We conclude on the synergies between CTA and other upcoming facilities that will foster the growth of γ cosmology.
Najdeno v: ključnih besedah
Povzetek najdenega: ...Telescope Array, active galactic nuclei, gamma-ray experiments, axions, extragalactic magnetic fields...
Ključne besede: Cherenkov Telescope Array, active galactic nuclei, gamma-ray experiments, axions, extragalactic magnetic fields
Objavljeno: 02.03.2021; Ogledov: 476; Prenosov: 20
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Search for Axionlike-Particle-Induced Prompt γ -Ray Emission from Extragalactic Core-Collapse Supernovae with the Fermi Large Area TelescopeManuel Meyer
, Tanja Petrushevska
, 2020, izvirni znanstveni članek
Opis: During a core-collapse supernova (SN), axionlike particles (ALPs) could be produced through the Primakoff process and subsequently convert into γ rays in the magnetic field of the Milky Way. We do not find evidence for such a γ-ray burst in observations of extragalactic SNe with the Fermi Large Area Telescope (LAT). The SN explosion times are estimated from optical light curves and we find a probability of about ∼90% that the LAT observed at least one SN at the time of the core collapse. Under the assumption that at least one SN was contained within the LAT field of view, we exclude photon-ALP couplings ≳2.6×10−12 GeV−1 for ALP masses ma≲3×10−10 eV, improving previous limits from SN1987A by a factor of 2.
Najdeno v: ključnih besedah
Povzetek najdenega: ...darn matter, axions, axion-like particles, core-collapse supernovae...
Ključne besede: darn matter, axions, axion-like particles, core-collapse supernovae
Objavljeno: 15.06.2020; Ogledov: 898; Prenosov: 35
Polno besedilo (30,47 MB)