246,613 research outputs found
Weak cosmic censorship in gravitational collapse with astrophysical parameter values
The possible violation of the weak cosmic censorship hypothesis in
astrophysical phenomena can provide us with the information about
trans-Planckian physics through observations. We present negative evidence,
however, that one should not expect such a possibility at least when the
deviation from spherical symmetry is negligible and the parameter values of
collapse are astrophysically reasonable. Taking the Lema\^itre-Tolman-Bondi
solution as the model most likely to counter the weak hypothesis, we show that
the mass () and density () of the collapsing object produce a gravitational field strong
enough to capture any null rays soon after emanating from the singularity.Comment: 10 pages, 2 figures, 1 table; v2: title changed, to appear in
Progress of Theoretical and Experimental Physic
adobe medicus 2013 5 September-October
https://digitalrepository.unm.edu/adobe-medicus/1076/thumbnail.jp
Cell walls of the dimorphic fungal pathogens Sporothrix schenckii and Sporothrix brasiliensis exhibit bilaminate structures and sloughing of extensive and intact layers
This work was supported by the Fundação Carlos Chagas de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ), grants E-26/202.974/2015 and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), grants 229755/2013-5, Brazil. LMLB is a senior research fellow of CNPq and Faperj. NG acknowledged support from the Wellcome Trust (Trust (097377, 101873, 200208) and MRC Centre for Medical Mycology (MR/N006364/1). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.Peer reviewedPublisher PD
The Dark Side of Neutron Stars
We review severe constraints on asymmetric bosonic dark matter based on
observations of old neutron stars. Under certain conditions, dark matter
particles in the form of asymmetric bosonic WIMPs can be effectively trapped
onto nearby neutron stars, where they can rapidly thermalize and concentrate in
the core of the star. If some conditions are met, the WIMP population can
collapse gravitationally and form a black hole that can eventually destroy the
star. Based on the existence of old nearby neutron stars, we can exclude
certain classes of dark matter candidates.Comment: Presented at ICRC 2013, 5 pages, 1 figur
Critical Point and Deconfinement from Dyson-Schwinger Equations
We employ the Dyson-Schwinger equations for quark and gluon propagators in
order to study QCD with 2+1 flavours at finite temperature and density. In a
suitable truncation for these equations, we determine the position of the
critical end-point as well as the deconfinement temperature at all chemical
potentials. For the latter, the Polyakov-loop potential is obtained from the
QCD propagators. This is possible for the first time at finite chemical
potential, with implications for effective models.Comment: Proceedings for the 8th International Workshop on Critical Point and
Onset of Deconfinement (CPOD 2013). 5 pages, 5 figure
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