scholarly journals Neutron stars in massive scalar-Gauss-Bonnet gravity: Spherical structure and time-independent perturbations

2022 ◽  
Vol 105 (2) ◽  
Author(s):  
Rui Xu ◽  
Yong Gao ◽  
Lijing Shao
Keyword(s):  
Neutron Stars ◽  
Massive Scalar ◽  
Bonnet Gravity ◽  
Spherical Structure

scholarly journals Gravitational waves in modified Gauss–Bonnet gravity

2020 ◽  
Vol 29 (10) ◽  
pp. 2050072
Author(s):  
Tomohiro Inagaki ◽  
Masahiko Taniguchi
Keyword(s):  
General Relativity ◽  
Gravitational Waves ◽  
Wave Equations ◽  
Massive Scalar ◽  
Speed Of Light ◽  
Bonnet Gravity ◽  
Cosmological Background ◽  
Background Curvature ◽  
Scalar Mode ◽  
Metric Perturbation

We study the gravitational waves (GWs) in modified Gauss–Bonnet gravity. Applying the metric perturbation around a cosmological background, we obtain explicit expressions for the wave equations. It is shown that the speed of the traceless mode is equal to the speed of light. An additional massive scalar mode appears in the propagation of the GWs. To find phenomena beyond the general relativity, the scalar mode mass is calculated as a function of the background curvature in some typical models.

scholarly journals Ultra-long-lived quasi-normal modes of neutron stars in massive scalar-tensor gravity

2020 ◽  
Vol 130 (5) ◽  
pp. 50002 ◽  
Author(s):  
Jose Luis Blázquez-Salcedo ◽  
Fech Scen Khoo ◽  
Jutta Kunz
Keyword(s):  
Neutron Stars ◽  
Normal Modes ◽  
Massive Scalar

ASYMPTOTIC QUASINORMAL MODES IN EINSTEIN–GAUSS–BONNET GRAVITY

2011 ◽  
Vol 26 (16) ◽  
pp. 2783-2794 ◽  
Author(s):  
J. SADEGHI ◽  
A. BANIJAMALI ◽  
M. R. SETARE ◽  
H. VAEZ
Keyword(s):  
Scalar Field ◽  
Effective Potential ◽  
Quasinormal Modes ◽  
Space Time ◽  
Massive Scalar ◽  
Massive Scalar Field ◽  
Momentum Vector ◽  
Five Dimensions ◽  
Bonnet Gravity ◽  
Temperature Scalar

In this paper we consider a massive scalar field on the boundary of AdS space–time and calculate the quasinormal modes for the string inspired Einstein–Gauss–Bonnet gravity in five dimensions. We study the effects of Gauss–Bonnet parameter, temperature, scalar field's mass and momentum vector on the effective potential and quasinormal modes.

scholarly journals Tolman–Oppenheimer–Volkoff equations in modified Gauss–Bonnet gravity

2015 ◽  
Vol 12 (02) ◽  
pp. 1550014 ◽  
Author(s):  
D. Momeni ◽  
R. Myrzakulov
Keyword(s):  
Neutron Stars ◽  
Dynamical Equations ◽  
Bonnet Gravity ◽  
Classical Gravity ◽  
Metric Functions ◽  
Modified Forms

Based on a stringy inspired Gauss–Bonnet (GB) modification of classical gravity, we constructed a model for neutron stars. We derived the modified forms of Tolman–Oppenheimer–Volkoff (TOV) equations for a generic function of f(G) gravity. The hydrostatic equations remained unchanged but the dynamical equations for metric functions are modified due to the effects of GB term.

scholarly journals Slowly rotating neutron stars in scalar-tensor theories with a massive scalar field

2016 ◽  
Vol 93 (8) ◽  
Author(s):  
Stoytcho S. Yazadjiev ◽  
Daniela D. Doneva ◽  
Dimitar Popchev
Keyword(s):  
Scalar Field ◽  
Neutron Stars ◽  
Massive Scalar ◽  
Massive Scalar Field
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