Topologically modified Einstein equation: a solution with singularities on $${\mathbb {S}}^3$$ S 3

Autor: Quentin Vigneron, Áron Szabó, Pierre Mourier

Publikováno v: European Physical Journal C: Particles and Fields, Vol 84, Iss 11, Pp 1-16 (2024)

Abstract Vigneron (Found Phys 54:15, https://doi.org/10.1007/s10701-023-00749-z , 2024) recently proposed a modification of general relativity in which a non-dynamical term related to the spatial topology is introduced in the Einstein equation. The o

Externí odkaz: https://doaj.org/article/b36cf751be2842238ba7442cc61c4afb

Is backreaction in cosmology a relativistic effect? On the need for an extension of Newton's theory to non-Euclidean topologies

Autor: Quentin Vigneron

Publikováno v: Physical Review D
Phys.Rev.D
Phys.Rev.D, 2022, 105 (4), pp.043524. ⟨10.1103/PhysRevD.105.043524⟩

Cosmological backreaction corresponds to the effect of inhomogeneities of structure on the global expansion of the Universe. The main question surrounding this phenomenon is whether or not it is important enough to lead to measurable effects on the s

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f2e04d56135c2a09af34296624050289

The 1+3-Newton-Cartan system and Newton-Cartan cosmology

Autor: Quentin Vigneron

Publikováno v: Physical Review D
Physical Review D, American Physical Society, 2021, 103 (6), pp.064064. ⟨10.1103/PhysRevD.103.064064⟩
Phys.Rev.D
Phys.Rev.D, 2021, 103 (6), pp.064064. ⟨10.1103/PhysRevD.103.064064⟩

We perform a covariant 1+3 split of the Newton-Cartan equations. The resulting 3-dimensional system of equations, called \textit{the 1+3-Newton-Cartan equations}, is structurally equivalent to the 1+3-Einstein equations. In particular it features the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::864da95253d74eb1d12c99ddcf66b8e1
http://arxiv.org/abs/2012.10213

87Sr/86Sr dating and preliminary interpretation of magnetic susceptibility logs of giant piston cores from the Rio Grande Rise in the South Atlantic

Autor: Eugênio Pires Frazão, José Adilson Dias Cavalcanti, Vadim Harlamov, Roberto Ventura Santos, Elton Luiz Dantas, Ivo Bruno Machado Pessanha, Quentin Vigneron, Isabela Moreno Cordeiro de Sousa, Christian Michel Lacasse, Maria Aline Lisniowski

Publikováno v: Journal of South American Earth Sciences. 80:244-254

Giant piston cores recovered from shallow depths ( 87 Sr/ 86 Sr seawater variation through geological times. Depth-to-age conversion of the magnetic susceptibility logs was implemented based on the identification of correlative peaks between cores an

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7431c748fd52aa231ea2a9492cab3c86
https://doi.org/10.1016/j.jsames.2017.09.034

Tidal disruption of stars in a supermassive black hole binary system: the influence of orbital properties on fallback and accretion rates

Autor: Alessio Guidarelli, Giuseppe Lodato, Quentin Vigneron

Publikováno v: Mon.Not.Roy.Astron.Soc.
Mon.Not.Roy.Astron.Soc., 2018, 476 (4), pp.5312-5322. ⟨10.1093/mnras/sty585⟩
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, 2018, 476 (4), pp.5312-5322. ⟨10.1093/mnras/sty585⟩

The disruption of a star by a supermassive black hole generates a sudden bright flare. Previous studies have focused on the disruption by single black holes, for which the fallback rate decays as~$\propto t^{-5/3}$. In this paper, we generalise the s

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::76986540212cc85b5f697f115595b904
https://hal.archives-ouvertes.fr/hal-01758108