scholarly journals Post-Newtonian limit of scalar-torsion theories of gravity as analogue to scalar-curvature theories

2020 ◽  
Vol 101 (2) ◽  
Author(s):  
Elena D. Emtsova ◽  
Manuel Hohmann
Keyword(s):  
Scalar Curvature ◽  
Newtonian Limit ◽  
Theories Of Gravity ◽  
Torsion Theories

scholarly journals Light propagation and optical scalars in torsion theories of gravity

2019 ◽  
Vol 34 (04) ◽  
pp. 1950029
Author(s):  
Siamak Akhshabi
Keyword(s):  
Gravitational Lensing ◽  
Light Propagation ◽  
Raychaudhuri Equation ◽  
Angular Diameter Distance ◽  
Propagation Of Light ◽  
Light Rays ◽  
Theories Of Gravity ◽  
Torsion Theories ◽  
Basic Equations ◽  
Gauge Theory Of Gravity

We investigate the propagation of light rays and evolution of optical scalars in gauge theories of gravity where torsion is present. Recently, the modified Raychaudhuri equation in the presence of torsion has been derived. We use this result to derive the basic equations of geometric optics for several different interesting solutions of the Poincaré gauge theory of gravity. The results show that the focusing effects for neighboring light rays will be different than general relativity. This in turn has practical consequences in the study of gravitational lensing effects and also in determining the angular diameter distance for cosmological objects.

scholarly journals Thin-shell wormholes in $$(2+1)$$-dimensional F(R) theories

2021 ◽  
Vol 81 (7) ◽  
Author(s):  
Cecilia Bejarano ◽  
Ernesto F. Eiroa ◽  
Griselda Figueroa-Aguirre
Keyword(s):  
Scalar Curvature ◽  
Thin Shell ◽  
Constant Scalar Curvature ◽  
De Sitter ◽  
Circular Symmetry ◽  
Theories Of Gravity ◽  
Thin Shell Wormholes ◽  
Stable Solutions ◽  
The Stability

AbstractWe construct a broad family of thin-shell wormholes with circular symmetry in $$(2+1)$$ ( 2 + 1 ) -dimensional F(R) theories of gravity, with constant scalar curvature R. We study the stability of the static configurations under perturbations preserving the symmetry. We present examples of charged thin-shell wormholes which are asymptotically anti-de Sitter at both sides of the throat. We show that stable solutions are possible when suitable values of the parameters are taken.

scholarly journals The parameterized post-Newtonian limit of bimetric theories of gravity

2010 ◽  
Vol 27 (23) ◽  
pp. 235020 ◽  
Author(s):  
Timothy Clifton ◽  
Máximo Bañados ◽  
Constantinos Skordis
Keyword(s):  
Newtonian Limit ◽  
Theories Of Gravity

scholarly journals Constraining scalar-tensor gravity models by S2 star orbits around the galactic center

2019 ◽  
Vol 17 (1, spec.issue) ◽  
pp. 11-20
Author(s):  
Vesna Borka-Jovanovic ◽  
Predrag Jovanovic ◽  
Dusko Borka ◽  
Salvatore Capozziello ◽  
Stefania Gravina ◽  
...  
Keyword(s):  
General Relativity ◽  
Black Hole ◽  
Galactic Center ◽  
Newtonian Limit ◽  
Gravity Models ◽  
Kinematics And Dynamics ◽  
Supermassive Black Hole ◽  
Theories Of Gravity ◽  
Orbital Precession ◽  
Best Fit

The aim of our investigation is to derive a particular theory among the class of scalar-tensor(ST) theories of gravity, and then to test it by studying kinematics and dynamics of S-stars around a supermassive black hole (BH) at Galactic Center (GC). We also discuss the Newtonian limit of this class of ST theories of gravity, as well as its parameters. We compare the observed orbit of S2 star with our simulated orbit which we obtained theoretically with the derived ST potential and constrained parameters. Using the obtained best-fit parameters we calculated orbital precession of S2 star in ST gravity and found that it has the same direction as in General Relativity (GR) but causes much larger pericenter shift.

Sign in / Sign up

Export Citation Format

Share Document