Zobrazeno 1 - 10
of 72
pro vyhledávání: '"Marciu, Mihai"'
The paper studies different observational features in the case of a specific cubic gravity theory, based on third order contractions of the Riemann tensor. Considering viable cosmic chronometers data, baryon acoustic oscillations, and supernovae, we
Externí odkaz:
http://arxiv.org/abs/2311.11297
Autor:
Marciu, Mihai, Ioan, Dana Maria
In the present manuscript the basic Einstein--Hilbert cosmological model is extended, by adding a new functional $F(G, T_{\mu\nu}T^{\mu\nu})$ in the fundamental action, encoding specific geometrical effects due to a nontrivial coupling with the Gauss
Externí odkaz:
http://arxiv.org/abs/2305.13045
Autor:
Marciu, Mihai, Ioan, Dana Maria
The paper extends basic Einstein--Hilbert action by adding a newly proposed invariant constructed from a specific contraction between the Einstein tensor and the energy momentum tensor, encoding a non--minimal coupling between the space--time geometr
Externí odkaz:
http://arxiv.org/abs/2302.04186
Autor:
Marciu, Mihai
The paper proposes a novel cosmological model based on a two-field scenario, where the two fields are independently coupled with a specific invariant, based on cubic contractions of the Riemann tensor. After obtaining the modified Friedmann equations
Externí odkaz:
http://arxiv.org/abs/2207.01979
Autor:
Marciu, Mihai
A new cosmological theory is proposed in the theoretical framework of modified gravity theories which is based on a tachyonic field non-minimally coupled with a specific topological invariant constructed with third order contractions of the Riemann t
Externí odkaz:
http://arxiv.org/abs/2203.00598
Autor:
Marciu, Mihai
In the present paper a new cosmological model is proposed by extending the Einstein--Hilbert lagrangian with a generic functional $f(R,P)$, which depends on the scalar curvature $R$ and a term $P$ which encodes a possible influence from specific cubi
Externí odkaz:
http://arxiv.org/abs/2103.08420
Autor:
Marciu, Mihai1 (AUTHOR) mihai.marciu@drd.unibuc.ro, Ioan, Dana Maria1 (AUTHOR), Dragomir, Mihai1 (AUTHOR)
Publikováno v:
European Physical Journal C -- Particles & Fields. Feb2024, Vol. 84 Issue 2, p1-13. 13p.
Autor:
Marciu, Mihai
In this work we have studied a cosmological model based on a quintom dark energy model non-minimally coupled with gravity, endowed with a specfic potential energy of the exponential squared type. For this specific type of potential energy and non-min
Externí odkaz:
http://arxiv.org/abs/2005.03443
Autor:
Marciu, Mihai
Publikováno v:
Phys. Rev. D 102, 023517 (2020)
The paper studies a new type of dark energy, a scalar field with positive or negative kinetic energy, generically coupled to a term which is composed by specific contractions of the Riemann tensor. After presenting the resulting field equations, we h
Externí odkaz:
http://arxiv.org/abs/2004.07120
Publikováno v:
Nucl.Phys. B 962 (2020), 115238
The present paper represents an attempt for a very generic string inspired theory of gravitation, based on a stringy action in the teleparallel gravity which includes a specific functional which depends on the scalar field and its kinetic energy, as
Externí odkaz:
http://arxiv.org/abs/2003.13434