scholarly journals Cosmic string loop collapse in full general relativity

2019 ◽  
Vol 99 (10) ◽  
Author(s):  
Thomas Helfer ◽  
Josu C. Aurrekoetxea ◽  
Eugene A. Lim
Keyword(s):  
General Relativity ◽  
Cosmic String ◽  
String Loop

scholarly journals A type of Levi–Civita solution in modified Gauss–Bonnet gravity

2014 ◽  
Vol 92 (2) ◽  
pp. 173-176 ◽  
Author(s):  
M.E. Rodrigues ◽  
M.J.S. Houndjo ◽  
D. Momeni ◽  
R. Myrzakulov
Keyword(s):  
Exact Solution ◽  
General Relativity ◽  
Perfect Fluid ◽  
Cosmic String ◽  
Coupling Parameter ◽  
Vacuum Solution ◽  
Einstein Gravity ◽  
Parameter Family ◽  
Bonnet Gravity ◽  
Cylindrically Symmetric

Herein we obtain an exact solution for cylindrically symmetric modified Gauss–Bonnet gravity. This metric is a generalization of the vacuum solution of Levi–Civita in general relativity. It describes an isotropic perfect fluid one-parameter family of the gravitational configurations, which can be interpreted as the exterior metric of a cosmic string. By setting the Gauss–Bonnet coupling parameter to zero, we recover the vacuum solution in the Einstein gravity as well.

scholarly journals f(T) gravity and energy distribution in Landau–Lifshitz prescription

2018 ◽  
Vol 27 (04) ◽  
pp. 1850039 ◽  
Author(s):  
M. G. Ganiou ◽  
M. J. S. Houndjo ◽  
J. Tossa
Keyword(s):  
General Relativity ◽  
Energy Density ◽  
Energy Distribution ◽  
Cosmic String ◽  
Mass Formula ◽  
Plane Symmetric ◽  
Symmetric Metrics ◽  
Teleparallel Theory ◽  
Momentum Complex ◽  
Theory View

We investigate in this paper the Landau–Lifshitz energy distribution in the framework of [Formula: see text] theory view as a modified version of Teleparallel theory. From some important Teleparallel theory results on the localization of energy, our investigations generalize the Landau–Lifshitz prescription from the computation of the energy–momentum complex to the framework of [Formula: see text] gravity as it is done in the modified versions of General Relativity. We compute the energy density in the first step for three plane-symmetric metrics in vacuum. We find for the second metric that the energy density vanishes independently of [Formula: see text] models. We find that the Teleparallel Landau–Lifshitz energy–momentum complex formulations for these metrics are different from those obtained in General Relativity for the same metrics. Second, the calculations are performed for the cosmic string spacetime metric. It results that the energy distribution depends on the mass [Formula: see text] and the radius [Formula: see text] of cosmic string and it is strongly affected by the parameter of the considered quadratic and cubic [Formula: see text] models. Our investigation with this metric induces interesting results susceptible to be tested with some astrophysics hypothesis.

scholarly journals Effects of inflation on a cosmic string loop population

2007 ◽  
Vol 76 (8) ◽  
Author(s):  
P. P. Avelino ◽  
C. J. A. P. Martins ◽  
E. P. S. Shellard
Keyword(s):  
Cosmic String ◽  
String Loop

Numerical analysis of the dynamics of a cosmic string loop as a vortex

1995 ◽  
Vol 345 (4) ◽  
pp. 416-421 ◽  
Author(s):  
Michiyasu Nagasawa ◽  
Jun'ichi Yokoyama
Keyword(s):  
Numerical Analysis ◽  
Cosmic String ◽  
String Loop

scholarly journals Constraints on the cosmic string loop collapse fraction from primordial black holes

2020 ◽  
Vol 101 (12) ◽  
Author(s):  
Chloe James-Turner ◽  
Danton P. B. Weil ◽  
Anne M. Green ◽  
Edmund J. Copeland
Keyword(s):  
Black Holes ◽  
Cosmic String ◽  
Primordial Black Holes ◽  
String Loop
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