Cosmological correlators for Bogoliubov initial states
Sign Up to like & getrecommendations! Published in 2024 at "Journal of High Energy Physics"
DOI: 10.1007/jhep09(2024)152
Abstract: We consider late-time correlators in de Sitter (dS) space for initial states related to the Bunch-Davies vacuum by a Bogoliubov transformation. We propose to study such late-time correlators by reformulating them in the familiar language… read more here.
Keywords: initial states; time correlators; space; late time ... See more keywords
Black hole thermodynamics with dynamical lambda
Sign Up to like & getrecommendations! Published in 2017 at "Journal of High Energy Physics"
DOI: 10.1007/jhep10(2017)118
Abstract: A bstractWe study evolution and thermodynamics of a slow-roll transition between early and late time de Sitter phases, both in the homogeneous case and in the presence of a black hole, in a scalar field… read more here.
Keywords: hole thermodynamics; thermodynamics; black hole; thermodynamics dynamical ... See more keywords
Evidence of Hierarchy in the Complex Fractured System of Geropotamos (Crete, Greece), as Extracted from Transient Electromagnetic Responses
Sign Up to like & getrecommendations! Published in 2018 at "Pure and Applied Geophysics"
DOI: 10.1007/s00024-018-1835-8
Abstract: The essential goals of this paper are to test the transient electromagnetic (TEM) response in a fractured geological complex medium and to better understand the physics introduced by associating a roughness parameter β to the… read more here.
Keywords: hierarchy complex; complex fractured; evidence hierarchy; transient electromagnetic ... See more keywords
Late-time asymptotic behavior of solutions to hyperbolic conservation laws on the sphere
Sign Up to like & getrecommendations! Published in 2019 at "Computer Methods in Applied Mechanics and Engineering"
DOI: 10.1016/j.cma.2019.02.012
Abstract: Abstract We consider nonlinear hyperbolic conservation laws posed on a curved geometry, referred to as “geometric Burgers equations” after Ben-Artzi and LeFloch (2007), when the underlying geometry is the sphere and the flux vector field… read more here.
Keywords: time; time asymptotic; late time; geometry ... See more keywords
Late time cosmic acceleration in modified Sáez–Ballester theory
Sign Up to like & getrecommendations! Published in 2020 at "Physics of the Dark Universe"
DOI: 10.1016/j.dark.2019.100446
Abstract: We establish an extended version of the modified Saez-Ballester (SB) scalar-tensor theory in arbitrary dimensions whose energy momentum tensor as well as potential are pure geometrical quantities. This scenario emerges by means of two scalar… read more here.
Keywords: cosmic acceleration; theory; tensor; time cosmic ... See more keywords
Osteopontin levels are associated with late-time lower regional brain volumes in multiple sclerosis
Sign Up to like & getrecommendations! Published in 2021 at "Scientific Reports"
DOI: 10.1038/s41598-021-03173-3
Abstract: Osteopontin (OPN) is a proinflammatory marker produced by systemic immune and central nervous system (CNS) resident cells. We examined, if the level of OPN in the cerebrospinal fluid (CSF) and blood is associated with late-time… read more here.
Keywords: late time; associated late; lower regional; regional brain ... See more keywords
BBN in constrained f(T,φ) gravity through various observational schemes
Sign Up to like & getrecommendations! Published in 2025 at "Classical and Quantum Gravity"
DOI: 10.1088/1361-6382/adfb3f
Abstract: In this article, we investigate the observational constraints for early Universe as well as the late-time accelerated expansion of the Universe in the realm of f(T,φ) gravity, where T is the torsion scalar and ϕ… read more here.
Keywords: bbn constrained; late time; gravity; constrained gravity ... See more keywords
Late time sky as a probe of steps and oscillations in primordial Universe
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2018/01/051
Abstract: The standard model of cosmology with nearly Gaussian, isotropic, scale invariant and adiabatic initial conditions describes the cosmological observations well. However, the study of any deviation from the mentioned conditions will open up a new… read more here.
Keywords: cmb lensing; cosmology; late time; physics ... See more keywords
A possible late-time transition of M B inferred via neural networks
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2024/09/060
Abstract: The strengthening of tensions in the cosmological parameters has led to reconsidering the fundamental aspects of standard cosmology. The tension in the Hubble constant can also be viewed as a tension between local and early… read more here.
Keywords: late time; possible late; cosmology; time transition ... See more keywords
Reconciling early and late time tensions with Reinforcement Learning
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2025/05/002
Abstract: We study the possibility of accommodating both early and late-time tensions using a novel reinforcement learning technique. By applying this technique, we aim to optimize the evolution of the Hubble parameter from recombination to the… read more here.
Keywords: late time; time tensions; early late; reinforcement learning ... See more keywords
Late-time accretion in neutron star mergers: Implications for short gamma-ray bursts and kilonovae
Sign Up to like & getrecommendations! Published in 2022 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stad1336
Abstract: We study the long-term ($t\gg 10\rm \, s$) evolution of the accretion disk after a neutron star(NS)-NS or NS-black hole merger, taking into account the radioactive heating by r-process nuclei formed in the first few… read more here.
Keywords: ray bursts; accretion; ray; neutron star ... See more keywords