caa a22 4500 445387742 CHVBK 20180317143037.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s10714-011-1229-z doi (NATIONALLICENCE)springer-10.1007/s10714-011-1229-z Neutrino trapping in braneworld extremely compact stars [Elektronische Daten] [Zdeněk Stuchlík, Jan Hladík, Martin Urbanec] Extremely Compact Stars (ECS) contain trapped null geodesics. When such objects enter the evolution period admitting geodetical motion of neutrinos, certain part of neutrinos produced in their interior will be trapped influencing their neutrino luminosity and thermal evolution. We study neutrino trapping in the braneworld ECS, assuming uniform distribution of neutrino emissivity and massless neutrinos. We give the efficiency of the neutrino trapping effects in the framework of the simple model of the internal spacetime with uniform distribution of energy density, and external spacetime described by the Reissner-Nordström geometry characterized by the braneworld "tidal” parameter b. For b < 0 the external spacetime is of the black-hole type, while for b >0 the external spacetime can be of both black-hole and naked-singularity type. Then the ECS surface radius R can be located also above the unstable (outer) photon circular orbit. Such basically new types of the spacetimes strongly alter the trapping phenomena as compared to the standard case of b=0. It is shown that the neutrino trapping effects are slightly lowered by the presence of physically more plausible case of b < 0, as compared to the standard internal Schwarzschild spacetime, while they can be magnified by positive tidal charges if b <1 and lowered for b > 1. However, potential astrophysical relevance of the trapping phenomena is strongly enhanced for negative tidal charges enabling a significant enlargement of the ECS surface radius to values coherent with recent observations. Springer Science+Business Media, LLC, 2011 Neutrino trapping nationallicence Braneworlds nationallicence Extremely compact stars nationallicence Stuchlík Zdeněk Faculty of Philosophy and Science, Institute of Physics, Silesian University in Opava, Bezručovo nám. 13, 746 01, Opava, Czech Republic aut Hladík Jan Faculty of Philosophy and Science, Institute of Physics, Silesian University in Opava, Bezručovo nám. 13, 746 01, Opava, Czech Republic aut Urbanec Martin Faculty of Philosophy and Science, Institute of Physics, Silesian University in Opava, Bezručovo nám. 13, 746 01, Opava, Czech Republic aut General Relativity and Gravitation Springer US; http://www.springer-ny.com 43/11(2011-11-01), 3163-3190 0001-7701 43:11<3163 2011 43 10714 https://doi.org/10.1007/s10714-011-1229-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10714-011-1229-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Stuchlík Zdeněk Faculty of Philosophy and Science, Institute of Physics, Silesian University in Opava, Bezručovo nám. 13, 746 01, Opava, Czech Republic aut NATIONALLICENCE 700 1- Hladík Jan Faculty of Philosophy and Science, Institute of Physics, Silesian University in Opava, Bezručovo nám. 13, 746 01, Opava, Czech Republic aut NATIONALLICENCE 700 1- Urbanec Martin Faculty of Philosophy and Science, Institute of Physics, Silesian University in Opava, Bezručovo nám. 13, 746 01, Opava, Czech Republic aut NATIONALLICENCE 773 0- General Relativity and Gravitation Springer US; http://www.springer-ny.com 43/11(2011-11-01), 3163-3190 0001-7701 43:11<3163 2011 43 10714 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer