Near-Critical Gravitational Collapse and the Initial Mass Function of Primordial Black Holes [PDF]
, 1998 The recent discovery of critical phenomena arising in gravitational collapse near the threshold of black hole formation is used to estimate the initial mass function of primordial black holes (PBHs).
A. M. Abrahams +13 more
core +2 more sources
Global monopole in scalar tensor theory [PDF]
, 1997 The well known monopole solution of Barriola and Vilenkin (BV) resulting from the breaking of a global SO(3) symmetry is extended in general relativity along with a zero mass scalar field and also in Brans-Dicke(BD) theory of gravity.In the case of BD ...
A A Sen +5 more
core +2 more sources
Geodesic Motions in 2+1 Dimensional Charged Black Holes [PDF]
, 1999 We study the geodesic motions of a test particle around 2+1 dimensional charged black holes. We obtain a class of exact geodesic motions for the massless test particle when the ratio of its energy and angular momentum is given by square root of ...
C. Farina +11 more
core +3 more sources
Robustness of a high-resolution central scheme for hydrodynamic simulations in full general relativity [PDF]
, 2005 A recent paper by Lucas-Serrano et al. indicates that a high-resolution central (HRC) scheme is robust enough to yield accurate hydrodynamical simulations of special relativistic flows in the presence of ultrarelativistic speeds and strong shock waves ...
A. Kurganov +5 more
core +1 more source
Numerical models of irrotational binary neutron stars in general relativity [PDF]
, 1998 We report on general relativistic calculations of quasiequilibrium configurations of binary neutron stars in circular orbits with zero vorticity. These configurations are expected to represent realistic situations as opposed to corotating configurations.
A. Lichnerowicz +24 more
core +2 more sources
Three-dimensional adaptive evolution of gravitational waves in numerical relativity [PDF]
, 2000 Adaptive techniques are crucial for successful numerical modeling of gravitational waves from astrophysical sources such as coalescing compact binaries, since the radiation typically has wavelengths much larger than the scale of the sources.
B. Brügmann +24 more
core +2 more sources
Apparent horizons in simplicial Brill wave initial data [PDF]
, 1998 We construct initial data for a particular class of Brill wave metrics using Regge calculus, and compare the results to a corresponding continuum solution, finding excellent agreement. We then search for trapped surfaces in both sets of initial data, and
Adrian P Gentle +13 more
core +2 more sources
Computing the Complete Gravitational Wavetrain from Relativistic Binary Inspiral [PDF]
, 2000 We present a new method for generating the nonlinear gravitational wavetrain from the late inspiral (pre-coalescence) phase of a binary neutron star system by means of a numerical evolution calculation in full general relativity.
A. Abrahams +33 more
core +2 more sources
Relativistic dust disks and the Wilson-Mathews approach
, 1998 Treating problems in full general relativity is highly complex and frequently approximate methods are employed to simplify the solution. We present comparative solutions of a infinitesimally thin relativistic, stationary, rigidly rotating disk obtained ...
G. Neugebauer +9 more
core +1 more source
Truncated post-Newtonian neutron star model [PDF]
, 1998 As a preliminary step towards simulating binary neutron star coalescing problem, we test a post-Newtonian approach by constructing a single neutron star model. We expand the Tolman-Oppenheimer-Volkov equation of hydrostatic equilibrium by the power of $c^
F. A. Rasio +34 more
core +2 more sources