Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Panayiotis C. Stavrinos"'
Publikováno v:
Universe, Vol 10, Iss 1, p 26 (2024)
In this article, we study the form of the deviation of geodesics (tidal forces) and the Raychaudhuri equation in a Schwarzschild–Finsler–Randers (SFR) spacetime which has been investigated in previous papers. This model is obtained by considering
Externí odkaz:
https://doaj.org/article/4fece52d3ed4481d875a6ac48d6df6b4
Autor:
Georgios Minas, Emmanuel N. Saridakis, Panayiotis C. Stavrinos, Alkiviadis Triantafyllopoulos
Publikováno v:
Universe, Vol 5, Iss 3, p 74 (2019)
We investigate the bounce realization in the framework of generalized modified gravities arising from Finsler and Finsler-like geometries. In particular, a richer intrinsic geometrical structure is reflected in the appearance of extra degrees of free
Externí odkaz:
https://doaj.org/article/736e0986ff374bc891ee6e3986738fa7
Publikováno v:
European Physical Journal
European Physical Journal C: Particles and Fields, Vol 81, Iss 11, Pp 1-11 (2021)
European Physical Journal C: Particles and Fields, Vol 81, Iss 11, Pp 1-11 (2021)
In this article, we study further applications of the Schwarzschild-Finsler-Randers (SFR) model which was introduced in a previous work. In this model, we investigate curvatures and the generalized Kretschmann invariant which plays a crucial role for
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bcf8e01cb6f92cf21a82dd974bfff93f
http://repo.scoap3.org/api
http://repo.scoap3.org/api
In this work we present the foundations of generalized scalar-tensor theories arising from vector bundle constructions, and we study the kinematic, dynamical and cosmological consequences. In particular, over a pseudo-Riemannian space-time base manif
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::11d34e7aaa203885f084c0c8175a2d00
http://arxiv.org/abs/2104.08024
http://arxiv.org/abs/2104.08024
Publikováno v:
Universe, Vol 7, Iss 89, p 89 (2021)
Universe
Volume 7
Issue 4
Universe
Volume 7
Issue 4
We study new classes of generic off-diagonal and diagonal cosmological solutions for effective Einstein equations in modified gravity theories (MGTs), with modified dispersion relations (MDRs), and encoding possible violations of (local) Lorentz inva
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a1395996bda99bd4a5e27db728297217
https://www.mdpi.com/2218-1997/7/4/89
https://www.mdpi.com/2218-1997/7/4/89
Autor:
Andronikos Paliathanasis, Panayiotis C. Stavrinos, G. Papagiannopoulos, Spyros Basilakos, Supriya Pan
Publikováno v:
European Physical Journal
European Physical Journal C: Particles and Fields, Vol 80, Iss 9, Pp 1-22 (2020)
European Physical Journal C: Particles and Fields, Vol 80, Iss 9, Pp 1-22 (2020)
In the context of Finsler–Randers theory we consider, for the first time, the cosmological scenario of the varying vacuum. In particular, we assume the existence of a cosmological fluid source described by an ideal fluid and the varying vacuum term
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5d864a9174e67d3c9d786405e1315c80
http://repo.scoap3.org/api
http://repo.scoap3.org/api
Publikováno v:
Universe, Vol 6, Iss 138, p 138 (2020)
Universe
Volume 6
Issue 9
Universe
Volume 6
Issue 9
The aim of this paper is to provide the geometrical structure of a gravitational field that includes the addition of dark matter in the framework of a Riemannian and a Riemann--Sasaki spacetime. By means of the classical Riemannian geometric methods
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e24b13ba4c0e8a0dd93ed9b365f9a1b1
https://www.mdpi.com/2218-1997/6/9/138
https://www.mdpi.com/2218-1997/6/9/138
We investigate the dynamics of gravitational field and particles in a generalized framework of a Lorentz tangent bundle. By variating an appropriate action for each case, we obtain generalized forms of paths and generalized field equations for a Sasa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6257c09ef471953a3c888be962ab484e
http://arxiv.org/abs/2004.00356
http://arxiv.org/abs/2004.00356
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 12, Pp 1-14 (2020)
European Physical Journal
European Physical Journal
In this work, we extend for the first time the spherically symmetric Schwarzschild and Schwarzschild-De Sitter solutions with a Finsler-Randers-type perturbation which is generated by a covector $A_\gamma$. This gives a locally anisotropic character
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7f5ad2e0c2f92be0a0563bf8bf161fad
We investigate the cosmological applications of scalar-tensor theories that arise effectively from the Lorentz fiber bundle of a Finsler-like geometry. We first show that the involved nonlinear connection induces a new scalar degree of freedom and ev
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e00cfa5dd8b39a13de8639bce296f482
http://arxiv.org/abs/1907.10950
http://arxiv.org/abs/1907.10950