scholarly journals Gravitational field of scalar lumps in higher-derivative gravity

2021 ◽  
Vol 103 (12) ◽  
Author(s):  
Luca Buoninfante ◽  
Yuichi Miyashita
Keyword(s):  
Gravitational Field ◽  
Higher Derivative

Dispersive photon propagation in semiclassical higher-derivative gravity

2015 ◽  
Vol 30 (11) ◽  
pp. 1550052 ◽  
Author(s):  
Antonio Accioly ◽  
José Helayël-Neto ◽  
F. E. Barone ◽  
Breno Giacchini ◽  
Wallace Herdy
Keyword(s):  
Gravitational Field ◽  
Coordinate System ◽  
Upper Bound ◽  
Massive Particle ◽  
Visible Spectrum ◽  
The Sun ◽  
Photon Propagation ◽  
External Gravitational Field ◽  
Higher Derivative ◽  
Gravity Equations

The scattering of a photon by a weak external gravitational field which is solution of the linearized higher-derivative gravity equations sourced by a point-like massive particle located at the origin of the coordinate system, is analyzed. It is shown that the [Formula: see text]-sector of the theory produces dispersive photon propagation. Subsequently, the angle |Δθ|(≡|θ violet -θ red |) at which the visible spectrum would be spread over in the case of a photon passing by the Sun is plotted as a function of the |β|-constant related to the [Formula: see text]-sector. An upper bound on |β| is then found. Interestingly enough, this limit is thirteen orders of magnitude below the accepted upper bound on |β|.

GRAVITATIONAL FIELD OF A STRAIGHT COSMIC STRING IN THE FRAMEWORK OF HIGHER-DERIVATIVE GRAVITY

2008 ◽  
Vol 23 (24) ◽  
pp. 1999-2009 ◽  
Author(s):  
ANTONIO ACCIOLY ◽  
JOSÉ HELAYËL-NETO ◽  
MATHEUS LOBO
Keyword(s):  
Gravitational Field ◽  
Cosmic String ◽  
Short Range ◽  
Gravitational Force ◽  
Deflection Angle ◽  
Einstein Gravity ◽  
Nonrelativistic Limit ◽  
Higher Derivative ◽  
The Deflection Angle ◽  
The Impact

The gravitational properties of a straight cosmic string are studied in the linear approximation of higher-derivative gravity. These properties are shown to be very different from those found using linearized Einstein gravity: there exists a short range gravitational (anti-gravitational) force in the nonrelativistic limit; in addition, the deflection angle of a light ray moving in a plane orthogonal to the string depends on the impact parameter.

A one-dimensional self-gravitating stellar gas

1966 ◽  
Vol 25 ◽  
pp. 46-48 ◽  
Author(s):  
M. Lecar
Keyword(s):  
Gravitational Field ◽  
Phase Space ◽  
Motion Picture ◽  
Space Distribution ◽  
Two Dimensional ◽  
One Dimensional ◽  
Phase Space Distribution ◽  
Dimensional Phase Space ◽  
The Mean

“Dynamical mixing”, i.e. relaxation of a stellar phase space distribution through interaction with the mean gravitational field, is numerically investigated for a one-dimensional self-gravitating stellar gas. Qualitative results are presented in the form of a motion picture of the flow of phase points (representing homogeneous slabs of stars) in two-dimensional phase space.

Evolution of collisional systems

1984 ◽  
Vol 75 ◽  
pp. 361-362
Author(s):  
André Brahic
Keyword(s):  
Gravitational Field ◽  
Dynamical Evolution ◽  
Oblate Planet

AbstractThe dynamical evolution of planetary discs in the gravitational field of an oblate planet and a satellite is numerically simulated.

Sedimentation of charged colloids in the gravitational field : Relaxation toward equilibrium

2000 ◽  
Vol 10 (PR5) ◽  
pp. Pr5-109-Pr5-112
Author(s):  
J.-F. Dufrêche ◽  
J.-P. Simonin ◽  
P. Turq
Keyword(s):  
Gravitational Field ◽  
Charged Colloids

Pair Production in a Field of Heavy Nuclei and in a Gravitational Field

1971 ◽  
Vol 105 (12) ◽  
pp. 780-781 ◽  
Author(s):  
Ya.B. Zel'dovich ◽  
Lev P. Pitaevskii ◽  
Valentin S. Popov ◽  
Aleksei A. Starobinskii
Keyword(s):  
Gravitational Field ◽  
Pair Production ◽  
Heavy Nuclei
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