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Article: Relativistic mass ejecta from phase-transition-induced collapse of neutron stars

TitleRelativistic mass ejecta from phase-transition-induced collapse of neutron stars
Authors
KeywordsCosmological neutrinos
Gamma ray bursts theory
Neutron stars
Issue Date2009
PublisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/EJ/journal/JCAP
Citation
Journal Of Cosmology And Astroparticle Physics, 2009, v. 2009 n. 9 How to Cite?
AbstractWe study the dynamical evolution of a phase-transition-induced collapse neutron star to a hybrid star, which consists of a mixture of hadronic matter and strange quark matter. The collapse is triggered by a sudden change of equation of state, which result in a large amplitude stellar oscillation. The evolution of the system is simulated by using a 3D Newtonian hydrodynamic code with a high resolution shock capture scheme. We find that both the temperature and the density at the neutrinosphere are oscillating with acoustic frequency. However, they are nearly 180° out of phase. Consequently, extremely intense, pulsating neutrino/antineutrino fluxes will be emitted periodically. Since the energy and density of neutrinos at the peaks of the pulsating fluxes are much higher than the non-oscillating case, the electron/positron pair creation rate can be enhanced dramatically. Some mass layers on the stellar surface can be ejected by absorbing energy of neutrinos and pairs. These mass ejecta can be further accelerated to relativistic speeds by absorbing electron/positron pairs, created by the neutrino and antineutrino annihilation outside the stellar surface. The possible connection between this process and the cosmological Gamma-ray Bursts is discussed. © 2009 IOP Publishing Ltd and SISSA.
Persistent Identifierhttp://hdl.handle.net/10722/91873
ISSN
2015 Impact Factor: 5.634
2015 SCImago Journal Rankings: 0.652
ISI Accession Number ID
Funding AgencyGrant Number
GRFHKU7013/ 06P
HKU7025/ 07P
National Science Foundation of China10625313
National Basic Research Program of China2009CB824800
Hong Kong Research Grants CouncilCUHK4018/ 07P
Chinese University of Hong Kong2060330
Funding Information:

We thank M. C. Chu, Z. G. Dai, P. Haensel, T. Lu, K. B. Luk, V. V. Usov and K. W. Wu for useful discussion, and the anonymous referee for very useful suggestions. KSC and TH are supported by the GRF Grants of the Government of the Hong Kong SAR under HKU7013/ 06P and HKU7025/ 07P respectively. YHF is supported by the National Science Foundation of China (grant 10625313), and the National Basic Research Program of China (grant 2009CB824800). LML is supported by the Hong Kong Research Grants Council (Grant No. CUHK4018/ 07P) and the direct grant (Project IDs: 2060330) from the Chinese University of Hong Kong. The computations were performed on the Computational Grid of the Chinese University of Hong Kong and the High Performance Computing Cluster of the University of Hong Kong.

References

 

DC FieldValueLanguage
dc.contributor.authorCheng, KSen_HK
dc.contributor.authorHarko, Ten_HK
dc.contributor.authorHuang, YFen_HK
dc.contributor.authorLin, LMen_HK
dc.contributor.authorSuen, WMen_HK
dc.contributor.authorTian, XLen_HK
dc.date.accessioned2010-09-17T10:29:05Z-
dc.date.available2010-09-17T10:29:05Z-
dc.date.issued2009en_HK
dc.identifier.citationJournal Of Cosmology And Astroparticle Physics, 2009, v. 2009 n. 9en_HK
dc.identifier.issn1475-7516en_HK
dc.identifier.urihttp://hdl.handle.net/10722/91873-
dc.description.abstractWe study the dynamical evolution of a phase-transition-induced collapse neutron star to a hybrid star, which consists of a mixture of hadronic matter and strange quark matter. The collapse is triggered by a sudden change of equation of state, which result in a large amplitude stellar oscillation. The evolution of the system is simulated by using a 3D Newtonian hydrodynamic code with a high resolution shock capture scheme. We find that both the temperature and the density at the neutrinosphere are oscillating with acoustic frequency. However, they are nearly 180° out of phase. Consequently, extremely intense, pulsating neutrino/antineutrino fluxes will be emitted periodically. Since the energy and density of neutrinos at the peaks of the pulsating fluxes are much higher than the non-oscillating case, the electron/positron pair creation rate can be enhanced dramatically. Some mass layers on the stellar surface can be ejected by absorbing energy of neutrinos and pairs. These mass ejecta can be further accelerated to relativistic speeds by absorbing electron/positron pairs, created by the neutrino and antineutrino annihilation outside the stellar surface. The possible connection between this process and the cosmological Gamma-ray Bursts is discussed. © 2009 IOP Publishing Ltd and SISSA.en_HK
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/EJ/journal/JCAPen_HK
dc.relation.ispartofJournal of Cosmology and Astroparticle Physicsen_HK
dc.subjectCosmological neutrinosen_HK
dc.subjectGamma ray bursts theoryen_HK
dc.subjectNeutron starsen_HK
dc.titleRelativistic mass ejecta from phase-transition-induced collapse of neutron starsen_HK
dc.typeArticleen_HK
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.emailHarko, T: harko@hkucc.hku.hken_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.identifier.authorityHarko, T=rp01333en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1088/1475-7516/2009/09/007en_HK
dc.identifier.scopuseid_2-s2.0-70350726458en_HK
dc.identifier.hkuros166039-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-70350726458&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume2009en_HK
dc.identifier.issue9en_HK
dc.identifier.isiWOS:000270659900007-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK
dc.identifier.scopusauthoridHarko, T=7006485783en_HK
dc.identifier.scopusauthoridHuang, YF=7501574835en_HK
dc.identifier.scopusauthoridLin, LM=8388053000en_HK
dc.identifier.scopusauthoridSuen, WM=7006977947en_HK
dc.identifier.scopusauthoridTian, XL=35115757900en_HK
dc.identifier.citeulike5708963-

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