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23 papers · 2 filters
Emergent universe in theories with natural UV cutoffs
Mohsen Khodadi, Kourosh Nozari, Emmanuel N. Saridakis
We investigate the realization of the emergent universe scenario in theories with natural UV cutoffs, namely a minimum length and a maximum momentum, quantified by a new deformatio…
A Homogeneous and Isotropic Universe in Lorentz Gauge Theory of Gravity
Ahmad Borzou, Behrouz Mirza
Lorentz gauge theory of gravity was recently introduced. We study the homogeneous and isotropic universe of this theory. It is shown that some time after the matter in the universe…
Observable acceleration of jets by a Kerr black hole
J. Gariel, N. O. Santos, Anzhong Wang
In the framework of a model based on the gravitational field of the Kerr black hole, we turn to investigate the kinematic behavior of extragalactic jets. We analytically calculate…
Cosmological models in modified gravity theories with extended nonminimal derivative couplings
Tiberiu Harko, Francisco S. N. Lobo, Emmanuel N. Saridakis +1
We construct gravitational modifications that go beyond Horndeski, namely theories with extended nonminimal derivative couplings, in which the coefficient functions depend not only…
Cosmological expansion and contraction from Pauli exclusion principle in -branes
Alireza Sepehri, Ahmed Farag Ali, Kazuharu Bamba +5
We show that the Pauli exclusion principle in a system of -branes can give rise to the expansion and contraction of the universe which is located on an -brane. We start wit…
Observational Constraints on gravity from varying fundamental constants
Rafael C. Nunes, Alexander Bonilla, Supriya Pan +1
We use observations related to the variation of fundamental constants, in order to impose constraints on the viable and most used gravity models. In particular, for the fine…
Three-dimensional charged Einstein-aether black holes and Smarr formula
Chikun Ding, Changqing Liu, Anzhong Wang +1
We investigate the three-dimensional behavior of gravity coupled to a dynamical unit timelike vector: the aether, and present two new classes of exact charged solutions. When c_{13…
gravitational baryogenesis
V. K. Oikonomou, Emmanuel N. Saridakis
We investigate how baryogenesis can occur by the presence of an -related gravitational term. We study various cases of gravity and we discuss in detail the effect of t…
Universal features of quantum bounce in loop quantum cosmology
Tao Zhu, Anzhong Wang, Klaus Kirsten +2
In this Letter, we study analytically the evolutions of the flat Friedmann-Lemaitre-Robertson-Walker (FLRW) universe and its linear perturbations in the framework of {\em the dress…
Current density and conductivity through modified gravity in the graphene with defects
Alireza Sepehri, Richard Pincak, Kazuharu Bamba +2
We propose a model describing the evolution of the free electron current density in graphene. Based on the concept of Mp-branes, we perform the analysis using the difference betwee…
New observational constraints on f(T) gravity from cosmic chronometers
Rafael C. Nunes, Supriya Pan, Emmanuel N. Saridakis
We use the local value of the Hubble constant recently measured with 2.4% precision, as well as the latest compilation of cosmic chronometers data, together with standard probes su…
Modified teleparallel gravity with higher-derivative torsion terms
Giovanni Otalora, Emmanuel N. Saridakis
We construct gravitational modifications, which are novel classes of modified theories arising from higher-derivative torsional terms in th…
Inflationary cosmology in unimodular gravity
Kazuharu Bamba, Sergei D. Odintsov, Emmanuel N. Saridakis
We investigate the inflationary realization in the context of unimodular gravity, which is based on the modification of teleparallel gravity, in which one imposes the…
Bounce and cyclic cosmology in weakly broken galileon theories
Shreya Banerjee, Emmanuel N. Saridakis
We investigate the bounce and cyclicity realization in the framework of weakly broken galileon theories. We study bouncing and cyclic solutions at the background level, reconstruct…
High-order Primordial Perturbations with Quantum Gravitational Effects
Tao Zhu, Anzhong Wang, Klaus Kirsten +2
In this paper, we provide a systematic investigation of high-order primordial perturbations with nonlinear dispersion relations due to quantum gravitational effects in the framewor…
Static and rotating universal horizons and black holes in gravitational theories with broken Lorentz invariance
Kai Lin, V. H. Satheeshkumar, Anzhong Wang
In this paper, we show the existence of static and rotating universal horizons and black holes in gravitational theories with the broken Lorentz invariance. We pay particular atten…
Hamilton-Jacobi formalism for inflation with non-minimal derivative coupling
Haidar Sheikhahmadi, Emmanuel N. Saridakis, Ali Aghamohammadi +1
In inflation with nonminimal derivative coupling there is not a conformal transformation to the Einstein frame where calculations are straightforward, and thus in order to extract…
Constraining the Schwarzschild-de Sitter Solution in Models of Modified Gravity
Lorenzo Iorio, Matteo Luca Ruggiero, Ninfa Radicella +1
The Schwarzschild-de Sitter (SdS) solution exists in the large majority of modified gravity theories, as expected, and in particular the effective cosmological constant is determin…
A Macroscopically Effective Lorentz Gauge Theory of Gravity
Ahmad Borzou
Following the ideas of effective field theories, we derive classically effective field equations of recently developed Lorentz gauge theory of gravity. It is shown that Newton's gr…
Bi-scalar modified gravity and cosmology with conformal invariance
Emmanuel N. Saridakis, Minas Tsoukalas
We investigate the cosmological applications of a bi-scalar modified gravity that exhibits partial conformal invariance, which could become full conformal invariance in the absence…
Hawking Radiation as a Probe for the Interior Structure of Regular Black Holes
Yanbin Deng, Gerald Cleaver
The notion of the black hole singularity and the proof of the singularity theorem were considered great successes in classical general relativity. Singularities had presented deep…
Modified Brans-Dicke cosmology with matter-scalar field interaction
Georgios Kofinas, Eleftherios Papantonopoulos, Emmanuel N. Saridakis
We discuss the cosmological implications of an extended Brans-Dicke theory presented recently, in which there is an energy exchange between the scalar field and ordinary matter, de…
Cosmology in new gravitational scalar-tensor theories
Emmanuel N. Saridakis, Minas Tsoukalas
We investigate the cosmological applications of new gravitational scalar-tensor theories, which are novel modifications of gravity possessing 2+2 propagating degrees of freedom, ar…