27 citations · 142 across the 13 of their papers we have counts for
13 papers
Gravitational energy-momentum pseudo-tensor in Palatini and metric gravity
H. Abedi, S. Capozziello, M. Capriolo +1
We derive the gravitational energy-momentum pseudo-tensor in both Palatini and metric approaches to gravity. We then obtain the related cosmological gravi…
Cosmological perturbations in gravitational energy-momentum complex
Habib Abedi, Amir M. Abbassi, Salvatore Capozziello
Starting from the energy-momentum of matter and gravitational field in the framework of General Relativity and Teleparallel Gravity, we obtain the energy-momentum complex in flat F…
F-term Inflation and RSII Brane Mode
M. Roostaee, Amir M. Abbassi
Considering hybrid F-term inflation in RSII model and using the most recent data from Planck 2018 and in comparison with Planck 2015and WMAP 9-year , we can obtain some interesting…
Hubble multi-scalar inflation
Habib Abedi, Amir M. Abbassi
Multiple field models of inflation exhibit new features than single field models. In this work, we study the hierarchy of parameters based on Hubble expansion rate in curved field…
Gravitational constant in multiple field gravity
Habib Abedi, Amir M. Abbassi
In the present study, we consider general form of the Lagrangian , that is a function of the Ricci scalar, multiple scalar fields and non-canonical kinetic terms.…
Gravitational Waves in a Spatially Closed deSitter Spacetime
Amir H. Abbassi, J. Khodagholizadeh, Amir M. Abbassi
Perturbation of gravitational fields may be decomposed into scalar,vector and tensor components.In this paper we concern with the evolution of tensor mode perturbations in a spatia…
Density-metric unimodular gravity: vacuum maximal symmetry
Amir H. Abbassi, Amir M. Abbassi
We have investigated the vacuum maximally symmetric solutions of recently proposed density-metric unimodular gravity theory,the results are widely different from inflationary senar…
Energy-momentum Density of Gravitational Waves
Amir M. Abbassi, Saeed Mirshekari
In this paper, we elaborate the problem of energy-momentum in general relativity by energy-momentum prescriptions theory. Our aim is to calculate energy and momentum densities for…
Cosmological constant influence on cosmic string spacetime
Amir H. Abbassi, Amir M. Abbassi
We investigate the line element of spacetime around a linear cosmic string in the presence of a cosmological constant. We obtain the metric and argue that it should be discarded be…
Energy-momentum Distribution in Static and Non-static Cosmic String Space-times
Amir M. Abbassi, Saeed Mirshekari, Amir H. Abbassi
We elaborate the problem of energy-momentum in general relativity by energy-momentum prescriptions theory. In this regard, we calculate M\oller,Landau-Lifshitz, Papapetrou, Einstei…
Energy-momentum Prescriptions in General Spherically Symmetric Space-times
Saeed Mirshekari, Amir M. Abbassi
Einstein, Landau-Lifshitz, Papapetrou, Weinberg, and Møller energy-momentum prescriptions in general spherically symmetric space-times are investigated. It is shown that for two sp…
On Energy Distribution of Two Space-times with Planar and Cylindrical Symmetries
Saeed Mirshekari, Amir M. Abbassi
Considering encouraging Virbhadra's results about energy distribution of non-static spherically symmetric metrics in Kerr-Schild class, it would be interesting to study some space-…
Density-metric unimodular gravity:vacuum spherical symmetry
Amir H. Abbassi, Amir M. Abbassi
We analyze an alternative theory of gravity characterized by metrics that are tensor density of rank(0,2)and weight-1/2.The metric compatibility condition is supposed to hold. The…