Zobrazeno 1 - 10
of 36
pro vyhledávání: '"Nicolaos Toumbas"'
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 5, Pp 1-63 (2024)
Abstract We extend a recent de Sitter holographic proposal and entanglement entropy prescription to generic closed FRW cosmologies in arbitrary dimensions, and propose that for large classes of bouncing and Big Bang/Big Crunch cosmologies, the full s
Externí odkaz:
https://doaj.org/article/e3ec46b1b5e041e5a7120cd788023ae7
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 8, Pp 1-66 (2023)
Abstract In the context of de Sitter static-patch holography, two prescriptions have been put forward for holographic entanglement entropy computations, the monolayer and bilayer proposals. In this paper, we reformulate both prescriptions in a covari
Externí odkaz:
https://doaj.org/article/a98a9c5e06084727bf683faa3c3024fa
Publikováno v:
Nuclear Physics B, Vol 991, Iss , Pp 116196- (2023)
We show that vanishing of the sigma-model beta-functions for the metric gμν, antisymmetric tensor Bμν and dilaton Φ of any string-theory model in D dimensions at tree level can be obtained from a universal effective action, provided that the fie
Externí odkaz:
https://doaj.org/article/da37362e33844962aebc89e47105e377
Publikováno v:
Journal of High Energy Physics, Vol 2021, Iss 12, Pp 1-16 (2021)
Abstract We determine the inner product on the Hilbert space of wavefunctions of the universe by imposing the Hermiticity of the quantum Hamiltonian in the context of the minisuperspace model. The corresponding quantum probability density reproduces
Externí odkaz:
https://doaj.org/article/b4203dad7cf64e5bacaebca22514ebfa
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 8, Pp 1-25 (2021)
Abstract We study the entanglement between soft and hard particles produced in generic scattering processes in QED. The reduced density matrix for the hard particles, obtained via tracing over the entire spectrum of soft photons, is shown to have a l
Externí odkaz:
https://doaj.org/article/3e0776ff9f814d9bafdce9b3db78648f
Publikováno v:
Nuclear Physics B, Vol 973, Iss , Pp 115600- (2021)
We consider the Hartle–Hawking wavefunction of the universe defined as a Euclidean path integral that satisfies the “no-boundary proposal.” We focus on the simplest minisuperspace model that comprises a single scale factor degree of freedom and
Externí odkaz:
https://doaj.org/article/74acd4ab388a4ec6a32832c1bcd913f3
Publikováno v:
Nuclear Physics B, Vol 952, Iss , Pp - (2020)
We define a three-dimensional quantum theory of gravity as the holographic dual of the Liouville conformal field theory. The theory is consistent and unitary by definition. The corresponding theory of gravity with negative cosmological constant has p
Externí odkaz:
https://doaj.org/article/71352a93797f4aac83f2730e83773b7b
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 8, Pp 1-13 (2018)
Abstract Explicit tests are presented of the conjectured entropic origin of the gravitational force. The gravitational force on a test particle in the vicinity of the horizon of a large Schwarzschild black hole in arbitrary spacetime dimensions is ob
Externí odkaz:
https://doaj.org/article/f54cbe8ab8da4176b540dc6601af610b
Autor:
Constantinos Pallis, Nicolaos Toumbas
Publikováno v:
Advances in High Energy Physics, Vol 2017 (2017)
We review the realization of Starobinsky-type inflation within induced-gravity supersymmetric (SUSY) and non-SUSY models. In both cases, inflation is in agreement with the current data and can be attained for sub-Planckian values of the inflation. Th
Externí odkaz:
https://doaj.org/article/a7e74c3035304a74b46ed06202c922cd
Publikováno v:
Proceedings of Corfu Summer Institute 2021 "School and Workshops on Elementary Particle Physics and Gravity" — PoS(CORFU2021).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2f9e2f106ee4c99ae0d5400164bf5a39
https://doi.org/10.22323/1.406.0159
https://doi.org/10.22323/1.406.0159