Zobrazeno 1 - 10
of 120
pro vyhledávání: '"Orlando Luongo"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 10, Pp 1-16 (2024)
Abstract The effects of cosmological expansion on quantum bosonic states are investigated, using quantum information theory. In particular, a generic Bogoliubov transformation of bosonic field modes is considered and the state change on a single mode
Externí odkaz:
https://doaj.org/article/4f9c6f66f9ac4e73bbe771e587606102
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 10, Pp 1-10 (2024)
Abstract In this paper, we compute departures in the black hole thermodynamics induced by either geometric or topological corrections to general relativity. Specifically, we analyze the spherically symmetric spacetime solutions of two modified gravit
Externí odkaz:
https://doaj.org/article/397f0a72024742bbaac1453499581236
Autor:
Youri Carloni, Orlando Luongo
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 5, Pp 1-11 (2024)
Abstract We modify the symmetric-teleparallel dark energy through the addition of a further Yukawa-like term, in which the non-metricity scalar, Q, is non-minimally coupled to a scalar field Lagrangian where the phion acts as quintessence, describing
Externí odkaz:
https://doaj.org/article/3af9015270184660bed6802208b04190
Autor:
Kuantay Boshkayev, Talgar Konysbayev, Yergali Kurmanov, Orlando Luongo, Marco Muccino, Aliya Taukenova, Ainur Urazalina
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 3, Pp 1-13 (2024)
Abstract We study thin accretion disks in the gravitational field of a class of rotating regular black holes. Our objective is to determine the key parameters governing these accretion disks: the radius of the innermost stable circular orbit $$(r_{\t
Externí odkaz:
https://doaj.org/article/28bf78e7b58b41fba4726815bc508755
Publikováno v:
Quantum Reports, Vol 6, Iss 1, Pp 90-109 (2024)
When studying the geometry of quantum states, it is acknowledged that mixed states can be distinguished by infinitely many metrics. Unfortunately, this freedom causes metric-dependent interpretations of physically significant geometric quantities suc
Externí odkaz:
https://doaj.org/article/e9951376142844b3a35d4e14c7f26593
Publikováno v:
Physics Letters B, Vol 848, Iss , Pp 138398- (2024)
We investigate the ground state entanglement entropy of a massive scalar field nonminimally coupled to spacetime curvature, assuming a static, spherically symmetric background. We first discretize the field Hamiltonian by introducing a lattice of sph
Externí odkaz:
https://doaj.org/article/991274ba946240f0b0da03d9470cfe03
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 2, Pp 1-13 (2023)
Abstract We show that the Einstein field equations with a negative cosmological constant can admit black hole solutions whose thermodynamics coincides with that of logotropic fluids, recently investigated to heal some cosmological and astrophysical i
Externí odkaz:
https://doaj.org/article/be91b1fe204e4759a628c691bc740b1f
Publikováno v:
Physics Letters B, Vol 834, Iss , Pp 137475- (2022)
We consider non-local Integral Kernel Theories of Gravity in a homogeneous and isotropic universe background as a possible scenario to drive the cosmic history. In particular, we investigate the cosmological properties of a gravitational action conta
Externí odkaz:
https://doaj.org/article/6df1027a5507415db1f211242f558a55
Autor:
Orlando Luongo
Publikováno v:
Physical Sciences and Technology, Vol 10, Iss 3-4 (2022)
The role of a scalar field is reexamined through the introduction of a quasi-quintessence model. Unlike quintessence, in the quasi-quintessence model, the pressure of the scalar field does not depend on its kinetic energy. This research note provides
Externí odkaz:
https://doaj.org/article/dbdd7d042a354f6d80aa690efbede54d
Autor:
Orlando Luongo, Hernando Quevedo
Publikováno v:
Entropy, Vol 25, Iss 7, p 1037 (2023)
We review the main aspects of geometrothermodynamics, a formalism that uses contact geometry and Riemannian geometry to describe the properties of thermodynamic systems. We show how to handle in a geometric way the invariance of classical thermodynam
Externí odkaz:
https://doaj.org/article/cfad8ea574304cacaed9b43f71f6fef2