Zobrazeno 1 - 10
of 54
pro vyhledávání: '"Javad T. Firouzjaee"'
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-11 (2024)
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-
Externí odkaz:
https://doaj.org/article/1626696179f444399320184618288bed
Autor:
Mohsen Khodadi, Javad T. Firouzjaee
Publikováno v:
Physics Letters B, Vol 857, Iss , Pp 138986- (2024)
Unlike generic models of regular black holes (BHs) with nonzero surface gravity on both Cauchy and event horizons, an inner-degenerate counterpart with zero Cauchy horizon surface gravity was recently proposed. For this regular BH solution with spher
Externí odkaz:
https://doaj.org/article/fbf2b51640424d9aab5be7de7844c002
A new constraint on the Hawking evaporation of primordial black holes in the radiation-dominated era
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 4, Pp 1-10 (2023)
Abstract In this paper, we revisit the evaporation and accretion of primordial black holes (PBHs) during cosmic history and compare them to see if both of these processes are constantly active for PBHs or not. Our calculations indicate that during th
Externí odkaz:
https://doaj.org/article/e19f4860a9244256842b2a66ab9b27e6
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 1, Pp 1-13 (2022)
Abstract In this paper, we probe in 4D Einstein–Gauss–Bonnet black hole and its thermodynamics. We illustrate the three asymptotically 4D EGB spacetime as an asymptotically flat, de Sitter, and Anti-de Sitter. Also, we apply the tunneling of the
Externí odkaz:
https://doaj.org/article/a2efb65e7ed74984ba34cd51b2ea6960
Publikováno v:
Nuclear Physics B, Vol 985, Iss , Pp 115993- (2022)
Inspired by string theory, Heisenberg's uncertainty principle can be generalized to include the photon-electron gravitational interaction, which leads to the Generalized Uncertainty Principle (GUP). Although GUP considers gravitational uncertainty at
Externí odkaz:
https://doaj.org/article/067c337bcf9a40418598f2feedae8386
Publikováno v:
Journal of High Energy Physics, Vol 2021, Iss 7, Pp 1-23 (2021)
Abstract Most of the inflationary scenarios that try to explain the origin of Primordial Black Holes (PBHs) from the enhancements of the power spectrum to values of order one, at the relevant scales, run into clashes with the Effective Field Theory (
Externí odkaz:
https://doaj.org/article/026ecf7f7f3346b78dac2d04a1c9afa1
Publikováno v:
The Astrophysical Journal, Vol 959, Iss 2, p 73 (2023)
The thermal history of the intergalactic medium is full of extremely useful data in the field of astrophysics and cosmology. In other words, by examining this environment in different redshifts, the effects of cosmology and astrophysics can be observ
Externí odkaz:
https://doaj.org/article/449cf5eac2754f03ba6678eea186d621
Publikováno v:
The Astrophysical Journal, Vol 954, Iss 2, p 164 (2023)
One of the fundamental questions about quasars is related to their central supermassive black holes. The reason for the existence of these black holes with such a huge mass is still unclear, and various models have been proposed to explain them. Howe
Externí odkaz:
https://doaj.org/article/1f4e981b095e48caaa78d013f92c3a2b
Publikováno v:
The Astrophysical Journal, Vol 947, Iss 2, p 46 (2023)
Today, the existence of supermassive black holes (SMBHs) in the center of galactic halos is almost confirmed. An extremely dense region referred to as dark-matter spike is expected to form around central SMBHs as they grow and evolve adiabatically. I
Externí odkaz:
https://doaj.org/article/95b0950fbe414a018d6637f927f72ebf
Autor:
Abasalt Rostami, Javad T. Firouzjaee
Publikováno v:
Universe, Vol 8, Iss 10, p 508 (2022)
We study the primary entanglement effect on the decoherence of reduced-density matrices of scalar fields, which interact with other fields or independent mode functions. We study the (leading) tree-level evolution of the scalar bispectrum due to a co
Externí odkaz:
https://doaj.org/article/68bfdebe2ba146cabb7c2fe5b82c11be