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Article: Electron-positron pair production in the electrosphere of quark stars

TitleElectron-positron pair production in the electrosphere of quark stars
Authors
KeywordsElementary particles
Issue Date2006
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2006, v. 643 n. 1 I, p. 318-331 How to Cite?
AbstractWe study Schwinger pair creation of charged particles due to the inhomogeneous electric field created by the thin electron layer at the surface of quark stars (the electrosphere). As suggested earlier, due to the low photon emissivity of the quark-gluon plasma and of the electrosphere, electron-positron pair emission could be the main observational signature of quark stars. To obtain the electron-positron pair creation rate we use the tunneling approach. Explicit expressions for the fermion creation rate per unit time per unit volume are derived, which generalize the classical Schwinger result. The finite-size effects in pair production, due to the presence of a boundary (the surface of the quark star), are also considered in the framework of a simple approach. It is shown that the boundary effects induce large quantitative and qualitative deviations of the particle production rate from what one deduces with the Schwinger formula and its generalization for the electric field of the electrosphere. The electron-positron pair emissivity and flux of the electrosphere of quark stars due to pair creation is considered, and the magnitude of the boundary effects for these parameters is estimated. Due to the inhomogeneity of the electric field distribution in the electrosphere and to the presence of the boundary effects, at high temperatures (T ≥ Ter ≈ 0.1 MeV) we find a lower electron-positron flux than previously estimated. The numerical value of the critical temperature Tcr depends on the surface potential of the star. We briefly consider the effect of the magnetic field on the pair creation process and show that the magnetic field can drastically enhance the pair creation rate. © 2006. The American Astronomical Society, All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/91813
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorHarko, Ten_HK
dc.contributor.authorCheng, KSen_HK
dc.date.accessioned2010-09-17T10:27:22Z-
dc.date.available2010-09-17T10:27:22Z-
dc.date.issued2006en_HK
dc.identifier.citationAstrophysical Journal Letters, 2006, v. 643 n. 1 I, p. 318-331en_HK
dc.identifier.issn2041-8205en_HK
dc.identifier.urihttp://hdl.handle.net/10722/91813-
dc.description.abstractWe study Schwinger pair creation of charged particles due to the inhomogeneous electric field created by the thin electron layer at the surface of quark stars (the electrosphere). As suggested earlier, due to the low photon emissivity of the quark-gluon plasma and of the electrosphere, electron-positron pair emission could be the main observational signature of quark stars. To obtain the electron-positron pair creation rate we use the tunneling approach. Explicit expressions for the fermion creation rate per unit time per unit volume are derived, which generalize the classical Schwinger result. The finite-size effects in pair production, due to the presence of a boundary (the surface of the quark star), are also considered in the framework of a simple approach. It is shown that the boundary effects induce large quantitative and qualitative deviations of the particle production rate from what one deduces with the Schwinger formula and its generalization for the electric field of the electrosphere. The electron-positron pair emissivity and flux of the electrosphere of quark stars due to pair creation is considered, and the magnitude of the boundary effects for these parameters is estimated. Due to the inhomogeneity of the electric field distribution in the electrosphere and to the presence of the boundary effects, at high temperatures (T ≥ Ter ≈ 0.1 MeV) we find a lower electron-positron flux than previously estimated. The numerical value of the critical temperature Tcr depends on the surface potential of the star. We briefly consider the effect of the magnetic field on the pair creation process and show that the magnetic field can drastically enhance the pair creation rate. © 2006. The American Astronomical Society, All rights reserved.en_HK
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_HK
dc.relation.ispartofAstrophysical Journal Lettersen_HK
dc.subjectElementary particlesen_HK
dc.titleElectron-positron pair production in the electrosphere of quark starsen_HK
dc.typeArticleen_HK
dc.identifier.emailHarko, T: harko@hkucc.hku.hken_HK
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.authorityHarko, T=rp01333en_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1086/502675en_HK
dc.identifier.scopuseid_2-s2.0-33745869421en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33745869421&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume643en_HK
dc.identifier.issue1 Ien_HK
dc.identifier.spage318en_HK
dc.identifier.epage331en_HK
dc.identifier.isiWOS:000237624900032-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridHarko, T=7006485783en_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK

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