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Singular and non-singular endstates in massless scalar field collapse
Singular and non-singular endstates in massless scalar field collapse
2011/10/14
We study the collapse of a massless scalar field coupled to gravity. A class of blackhole solutions are identified. We also report on a class of solutions where collapse starts from a regular spacelik...
Genericity of black holes and naked singularities in gravitational collapse
Gravitational collapse black holes naked singularity
2011/10/14
We investigate here the genericity and stability aspects for naked singularities and black holes that arise as the final states for a complete gravitational collapse of a spherical massive matter clou...
Quantum collapse in ground-state Fermi-Dirac-Landau plasmas
Quantum collapse ground-state Fermi-Dirac-Landau plasmas
2011/10/10
It is revealed that in a relativistically degenerate dense highly-magnetized electron-ion plasma the effective quantum-potential due to the total quantum-force acting on fermions may cancel-out causin...
Black Hole Formation in Failing Core-Collapse Supernovae
Black Hole Formation Core-Collapse Supernovae
2011/1/11
We present results of a systematic study of failing core-collapse supernovae and the formation of stellar-mass black holes (BHs). Using our open-source general-relativistic 1.5D code GR1D equipped wit...
Induced Rotation in 3D Simulations of Core Collapse Supernovae: Implications for Pulsar Spins
Induced Rotation 3D Simulations Core Collapse Supernovae
2011/1/11
It has been suggested that the observed rotation periods of radio pulsars might be induced by a non-axisymmetric spiral-mode instability in the turbulent region behind the stalled supernova bounce sho...
Forming Protostars in Molecular Clouds with Shocked Envelope Expansion and Core Collapse
ISM clouds — ISM individual (FeSt 1-457)— line: profiles — radiative transfer — stars
2010/11/12
Spectral observations of molecular line profiles reveal the so-called ‘blue profiles’ for
double-peaked molecular lines with stronger blue and weaker red peaks as notable features for star-forming cl...
On Luminous Blue Variables as the Progenitors of Core-Collapse Supernovae, especially Type IIn Supernovae
circumstellar matter stars: massive stars: mass-loss supernovae
2010/11/16
Luminous blue variable (LBV) stars are very massive, luminous, unstable stars that suffer frequent eruptions. In the last few years, these stars have been proposed as the direct progenitors of some co...
The revival of an explosion mechanism of massive stars - the quark hadron phase transition during the early post bounce phase of core collapse supernovae
Core collapse supernovae protoneutron stars general relativity radiation hydrodynamics
2010/11/16
We explore explosions of massive stars, which are triggered via the quark hadron phase transition during the early post bounce phase of core collapse supernovae. The onset of quark matter is favored u...
Theory holds that a star born with an initial mass between about 8 and 140 times the mass of the Sun will end its life through the catastrophic gravita- tional collapse of its iron core to a neutron s...
Studies of Stellar Collapse and Black Hole Formation with the Open-Source Code GR1D
stellar collapse neutron stars black holes supernovae
2010/11/9
We discuss results from simulations of black hole formation in failing core-collapse
supernovae performed with the code GR1D, a new open-source Eulerian spherically-symmetric
general-relativistic hy...
Cold uniform spherical collapse revisited
N-body simulations virialization spherical collapse
2010/11/10
We report results of a study of the Newtonian dynamics of N self-gravitating particles which start in a quasiuniform spherical configuration, without initial velocities.
Caltech Core-Collapse Project (CCCP) observations of type IIn supernovae: typical properties and implications for their progenitor stars
Cosmology and Extragalactic Astrophysics (astro-ph.CO) Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/31
Type IIn Supernovae (SNe IIn) are rare events, constituting only a few percent of all core-collapse SNe, and the current sample of well observed SNe IIn is small. Here, we study the four SNe IIn obser...
Dynamics of Viscous Dissipative Plane Symmetric Gravitational Collapse
Gravitational collapse Dissipation Junction conditions Dynamical equations Transport equations
2010/3/18
We present dynamical description of gravitational collapse in view of Misner and Sharp's formalism. Matter under consideration is a complicated fluid consistent with plane symmetry which we assume to ...
Effects of the Electromagnetic Field on Five-dimensional Gravitational Collapse
Electromagnetic field Gravitational collapse Cosmological constant
2010/3/18
This paper investigates the five-dimensional(5D) spherically symmetric gravitational collapse with positive cosmological constant in the presence of an electromagnetic field. The junction conditions b...
A new multi-dimensional general relativistic neutrino hydrodynamics code for core-collapse supernovae. I. Method and code tests in spherical symmetry
general relativistic core-collapse supernovae neutrino hydrodynamics code
2010/3/19
We present a new general relativistic (GR) code for hydrodynamic supernova simulations with neutrino transport in spherical and azimuthal symmetry (1D/2D). The code is a combination of the CoCoNuT hyd...