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  Thermodynamic Description of Inelastic Collisions in General Relativity

Hennig, J., Neugebauer, G., & Ansorg, M. (2007). Thermodynamic Description of Inelastic Collisions in General Relativity. Astrophysical Journal, 663(1), 450-460. doi:10.1086/518412.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-480F-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-4810-5
Genre: Journal Article

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 Creators:
Hennig, Jörg1, Author              
Neugebauer, Gernot, Author
Ansorg, Marcus2, Author
Affiliations:
1Geometric Analysis and Gravitation, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24012              
2Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24013              

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 Abstract: We discuss head-on collisions of neutron stars and disks of dust ("galaxies") following the ideas of equilibrium thermodynamics, which compares equilibrium states and avoids the description of the dynamical transition processes between them. As an always present damping mechanism, gravitational emission results in final equilibrium states after the collision. In this paper we calculate selected final configurations from initial data of colliding stars and disks by making use of conservation laws and solving the Einstein equations. Comparing initial and final states, we can decide for which initial parameters two colliding neutron stars (non-rotating Fermi gas models) merge into a single neutron star and two rigidly rotating disks form again a final (differentially rotating) disk of dust. For the neutron star collision we find a maximal energy loss due to outgoing gravitational radiation of 2.3% of the initial mass while the corresponding efficiency for colliding disks has the much larger limit of 23.8%.

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 Dates: 2007-07
 Publication Status: Published in print
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 Identifiers: eDoc: 316949
DOI: 10.1086/518412
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Title: Astrophysical Journal
  Alternative Title : Astrophys. J.
Source Genre: Journal
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Pages: - Volume / Issue: 663 (1) Sequence Number: - Start / End Page: 450 - 460 Identifier: -