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.

scholarly journals A GENERAL SOLUTION IN THE NEWTONIAN LIMIT OF f(R)-GRAVITY

2009 ◽  
Vol 24 (09) ◽  
pp. 659-665 ◽  
Author(s):  
S. CAPOZZIELLO ◽  
A. STABILE ◽  
A. TROISI
Keyword(s):  
General Solution ◽  
Gravity Model ◽  
General Result ◽  
Weak Field ◽  
Newtonian Limit ◽  
Newtonian Potential ◽  
Field Limit ◽  
Weak Field Limit ◽  
Theories Of Gravity ◽  
Physical Consequences

We show that any analytic f(R)-gravity model, in the metric approach, presents a weak field limit where the standard Newtonian potential is corrected by a Yukawa-like term. This general result has never been pointed out but often derived for some particular theories. This means that only f(R) = R allows to recover the standard Newton potential while this is not the case for other relativistic theories of gravity. Some considerations on the physical consequences of such a general solution are addressed.

scholarly journals Constraining Modified Theories of Gravity with Gravitational-Wave Stochastic Backgrounds

2016 ◽  
Vol 117 (9) ◽  
Author(s):  
Andrea Maselli ◽  
Stefania Marassi ◽  
Valeria Ferrari ◽  
Kostas Kokkotas ◽  
Raffaella Schneider
Keyword(s):  
Gravitational Wave ◽  
Modified Theories Of Gravity ◽  
Theories Of Gravity ◽  
Stochastic Backgrounds

scholarly journals Quantum extremal islands made easy. Part III. Complexity on the brane

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Juan Hernandez ◽  
Robert C. Myers ◽  
Shan-Ming Ruan
Keyword(s):  
Holographic Model ◽  
Bonnet Gravity ◽  
Higher Curvature Gravity ◽  
Theories Of Gravity

Abstract We examine holographic complexity in the doubly holographic model introduced in [1, 2] to study quantum extremal islands. We focus on the holographic complexity=volume (CV) proposal for boundary subregions in the island phase. Exploiting the Fefferman-Graham expansion of the metric and other geometric quantities near the brane, we derive the leading contributions to the complexity and interpret these in terms of the generalized volume of the island derived from the induced higher-curvature gravity action on the brane. Motivated by these results, we propose a generalization of the CV proposal for higher curvature theories of gravity. Further, we provide two consistency checks of our proposal by studying Gauss-Bonnet gravity and f(ℛ) gravity in the bulk.

Sign in / Sign up

Export Citation Format

Share Document