Constraints on dark matter annihilation from the Event Horizon Telescope observations of M87*
Sign Up to like & getrecommendations! Published in 2022 at "Journal of High Energy Physics"
DOI: 10.1007/jhep04(2022)018
Abstract: Abstract The fast developments of radio astronomy open a new window to explore the properties of Dark Matter (DM). The recent direct imaging of the supermassive black hole (SMBH) at the center of M87 radio… read more here.
Keywords: annihilation; dark matter; event horizon; horizon telescope ... See more keywords
Thermodynamics of event horizon with modified Hawking temperature in scalar-tensor gravity
Sign Up to like & getrecommendations! Published in 2018 at "General Relativity and Gravitation"
DOI: 10.1007/s10714-018-2460-7
Abstract: In recent past, Hawking temperature has been modified for the validity of thermodynamical laws at the event horizon in general relativity context. This lead to the introduction of modified Hawking temperature and it has been… read more here.
Keywords: hawking temperature; event horizon; thermodynamics;
Event Horizon Telescope observations exclude compact objects in baseline mimetic gravity
Sign Up to like & getrecommendations! Published in 2024 at "Scientific Reports"
DOI: 10.1038/s41598-024-78264-y
Abstract: Mimetic gravity has gained significant appeal in cosmological contexts, but static spherically symmetric space-times within the baseline theory are highly non-trivial: the two natural solutions are a naked singularity and a black hole space-time obtained… read more here.
Keywords: gravity; usepackage; mimetic gravity; horizon telescope ... See more keywords
Fractional Schwarzschild–Tangherlini black hole with a fractal event horizon
Sign Up to like & getrecommendations! Published in 2025 at "Classical and Quantum Gravity"
DOI: 10.1088/1361-6382/adec32
Abstract: We demonstrate that the implementation of the fractional and non-local Wheeler–DeWitt equation within the context of Schwarzschild geometry leads to the emergence of a Schwarzschild–Tangherlini black hole (BH), which is uniquely characterized by an event… read more here.
Keywords: black hole; event; tangherlini black; event horizon ... See more keywords
Probing axions via light circular polarization and event horizon telescope
Sign Up to like & getrecommendations! Published in 2022 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2023/04/017
Abstract: The impact of axion-like particles on the light polarization around the horizon of supermassive black hole (SMBH) is discussed in the light of the latest polarization measurement of the Event Horizon Telescope (EHT). We investigate… read more here.
Keywords: horizon telescope; event horizon; circular polarization; polarization ... See more keywords
Resolving accretion flows in nearby active galactic nuclei with the Event Horizon Telescope
Sign Up to like & getrecommendations! Published in 2019 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stz2874
Abstract: The Event Horizon Telescope (EHT), now with its first ever image of the photon ring around the supermassive black hole of M87, provides a unique opportunity to probe the physics of supermassive black holes through… read more here.
Keywords: event; accretion; event horizon; horizon telescope ... See more keywords
Accumulation of charge on an extremal black hole’s event horizon
Sign Up to like & getrecommendations! Published in 2025 at "Physical Review D"
DOI: 10.1103/m8zv-tnfm
Abstract: We numerically analyze the behavior of a charged scalar field on a fixed extremal Reissner-Nordstr\"om background. We find an extension of the Aretakis instability characterized by an accumulation of charge on the extremal event horizon.… read more here.
Keywords: accumulation charge; charge extremal; horizon; charge ... See more keywords
Extremal Kerr white holes as a source of ultrahigh energy particles
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review D"
DOI: 10.1103/physrevd.102.024002
Abstract: We consider a process where two identical massive particles fall inwards, starting from rest at infinity towards the extremal Kerr black hole, collide outside the event horizon in its vicinity, and produce two massless particles.… read more here.
Keywords: energy particles; event horizon; energy; horizon ... See more keywords
Physics in precision-dependent normal neighborhoods
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review D"
DOI: 10.1103/physrevd.102.084065
Abstract: We introduce a procedure to determine the size and shape of normal neighborhoods in any spacetimes and their dependence on the precision of the measurements performed by arbitrary observers. As an example, we consider the… read more here.
Keywords: event horizon; normal neighborhoods; physics; normal coordinates ... See more keywords
Does the black hole shadow probe the event horizon geometry
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review D"
DOI: 10.1103/physrevd.97.084020
Abstract: There is an exciting prospect of obtaining the shadow of astrophysical black holes (BHs) in the near future with the Event Horizon Telescope. As a matter of principle, this justifies asking how much one can… read more here.
Keywords: shadow; event horizon; horizon geometry; geometry ... See more keywords
Type-II Weyl Semimetal versus Gravastar
Sign Up to like & getrecommendations! Published in 2021 at "JETP Letters"
DOI: 10.1134/s0021364021160013
Abstract: The boundary between the type I and type II Weyl semimetals serves as the event horizon for the “relativistic” fermions. The interior of the black hole is represented by the type II Weyl semimetal, where… read more here.
Keywords: event horizon; vacuum; type weyl; horizon ... See more keywords