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Related papers: Radiating spherical collapse with heat flow

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We observe critical phenomena in spherical collapse of radiation fluid. A sequence of spacetimes $\cal{S}[\eta]$ is numerically computed, containing models ($\eta\ll 1$) that adiabatically disperse and models ($\eta\gg 1$) that form a black…

General Relativity and Quantum Cosmology · Physics 2009-10-22 Charles R. Evans , Jason S. Coleman

Star formation begins with the gravitational collapse of a dense core inside a molecular cloud. As the collapse progresses, the centre of the core begins to heat up as it becomes optically thick. The temperature and density in the centre…

Solar and Stellar Astrophysics · Physics 2015-06-16 N. Vaytet , G. Chabrier , E. Audit , B. Commercon , J. Masson , J. Ferguson , F. Delahaye

We examine radial oscillations of superfluid neutron stars at finite internal temperatures. For this purpose we generalize the description of relativistic superfluid hydrodynamics to the case of superfluid mixtures. We show that in a…

Astrophysics · Physics 2008-11-26 M. E. Gusakov , N. Andersson

We present a new model of large-scale multilayer convection in solar type stars. This model allows us to understand such self-similar structures observed at solar surface as granulation, supergranulation and giant cells. We study the…

Solar and Stellar Astrophysics · Physics 2010-12-17 E. A. Bruevich , I. K. Rozgacheva

Based on a previously found general class of quantum improved exact solutions composed of non-interacting (dust) particles, we model the gravitational collapse of stars. As the modeled star collapses a closed apparent 3-horizon is generated…

General Relativity and Quantum Cosmology · Physics 2015-05-20 Ramon Torres , Francesc Fayos

We present a discussion on some physical aspects of gravitational collapse which is based on a list of questions related to relevant issues in the study of that phenomenon. Providing answers to those questions we bring out the role played…

General Physics · Physics 2011-12-02 L. Herrera

A global view is given upon the study of collapsing shear-free perfect fluid spheres with heat flow. We apply a compact formalism, which simplifies the isotropy condition and the condition for conformal flatness. This formalism also…

General Relativity and Quantum Cosmology · Physics 2012-06-08 B. V. Ivanov

The initial state of the spherical gravitational collapse in general relativity has been studied with different methods, especially by using {\it a priori} given equations of state that describe the matter as a perfect fluid. We propose an…

General Relativity and Quantum Cosmology · Physics 2024-10-24 Elly Bayona , Hernando Quevedo , Miguel Alcubierre

The gravastar is an exotic compact object proposed as a final product of gravitational collapse of a massive object in order to resolve problems associated with black holes. It is enclosed by a thin crust and the inside of it is occupied by…

General Relativity and Quantum Cosmology · Physics 2023-05-03 Ken-ichi Nakao , Kazumasa Okabayashi , Tomohiro Harada

As it is well-known that the hydrodinamic collapse of the massive star iron core should lead to the production of a hot neutron star. The assumption is made that the thermonuclear burning of the envelope matter, accreting onto the hot…

Astrophysics · Physics 2009-10-31 S. S. Gershtein

The formation of chondrules is one of the oldest unsolved mysteries in meteoritics and planet formation. Recently an old idea has been revived: the idea that chondrules form as a result of collisions between planetesimals in which the…

Earth and Planetary Astrophysics · Physics 2015-01-26 Cornelis Petrus Dullemond , Sebastian Markus Stammler , Anders Johansen

We investigate the fate of a collapsing stellar core, which is the final state of evolution of a massive, rotating star of a Wolf-Rayet type. Such stars explode as type I b/c supernovae, which have been observed in association with long…

High Energy Astrophysical Phenomena · Physics 2024-01-31 Agnieszka Janiuk , Narjes Shahamat , Dominika Król

We develop a new numerical scheme for solving the radiative transfer equation in a spherically symmetric system. This scheme does not rely on any kind of diffusion approximation and it is accurate for optically thin, thick, and intermediate…

Instrumentation and Methods for Astrophysics · Physics 2018-05-31 Torsten Stamer , Shu-ichiro Inutsuka

In case of spherical symmetry, the assumptions of finite-time formation of a trapped region and regularity of its boundary --- the apparent horizon --- are sufficient to identify the form of the metric and energy-momentum tensor in its…

General Relativity and Quantum Cosmology · Physics 2020-01-13 Valentina Baccetti , Sebastian Murk , Daniel R. Terno

We construct an exact solution for the spherical gravitational collapse in a single coordinate patch. To describe the dynamics of collapse, we use a generalized form of the Painlev\'e-Gullstrand coordinates in the Schwarzschild spacetime.…

General Relativity and Quantum Cosmology · Physics 2011-08-19 Yuki Kanai , Masaru Siino , Akio Hosoya

Gravitational collapse in (n+2) dimensional quasi-spherical space-time is studied for a fluid with non vanishing radial pressure. An exact analytic solution is obtained (ignoring the arbitrary integration function) for the equation of state…

General Relativity and Quantum Cosmology · Physics 2008-11-26 Sanjukta Chakraborty , Subenoy Chakraborty , Ujjal Debnath

We study gravitational collapse of low-metallicity gas clouds and the formation of protostars by three-dimensional hydrodynamic simulations. Grain growth, non-equilibrium chemistry, molecular cooling, and chemical heating are solved in a…

Astrophysics of Galaxies · Physics 2018-08-30 Gen Chiaki , Naoki Yoshida , Shingo Hirano

We present simulations of initially stable isothermal clouds exposed to ionizing radiation from a discrete external source, and identify the conditions that lead to radiatively driven implosion and star formation. We use the Smoothed…

Solar and Stellar Astrophysics · Physics 2015-05-19 T. G. Bisbas , A. P. Whitworth , R. Wünsch , D. A. Hubber , S. Walch

We compute numerical simulations of spherical collapse triggered by a slow increase in external pressure. We compare isothermal models to models including cooling with a simple but self-consistent treatment of the coupling between gas,…

Astrophysics · Physics 2009-11-11 P. Lesaffre , A. Belloche , J. -P. Chieze , P. Andre

We investigate structure of self-gravitating disks, their fragmentation and evolution of the fragments (the clumps) using both analytic approach and three-dimensional radiation hydrodynamics simulations starting from molecular cores. The…

Solar and Stellar Astrophysics · Physics 2015-06-19 Yusuke Tsukamoto , Sanemichi Z. Takahashi , Masahiro N. Machida , Shu-ichiro Inutsuka