Zobrazeno 1 - 10
of 21
pro vyhledávání: '"Pacheco, Jose Antonio de Freitas"'
Publikováno v:
Universe,7, 2021, 8, 17
The recent claim by the NANOGrav collaboration of a possible detection of an isotropic gravitational wave background stimulated a series of investigations searching for the origin of such a signal. The QCD phase transition appears as a natural candid
Externí odkaz:
http://arxiv.org/abs/2108.10727
The stochastic gravitational wave background produced by supernovas, magnetars and merger of binaries constituted by a pair of compact objects is reviewed and updated. The merger of systems composed by two black holes dominates by far the background
Externí odkaz:
http://arxiv.org/abs/2001.09663
The discovery of high redshift quasars represents a challenge to the origin of supermassive black holes. Here, two evolutionary scenarios are considered. The first one concerns massive black holes in the local universe, which in a large majority have
Externí odkaz:
http://arxiv.org/abs/2001.08420
Akademický článek
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Publikováno v:
Universe 4, 62, 2018 - special issue: Black hole thermodynamics
The possibility that dark matter particles could be constituted by extreme regular primordial black holes is discussed. Extreme black holes have zero surface temperature, and are not subjected to the Hawking evaporation process. Assuming that the com
Externí odkaz:
http://arxiv.org/abs/1805.03053
The evolution of the baryon distribution in different phases, derived from cosmological simulations, are here reported. These computations indicate that presently most of baryons are in a warm-hot intergalactic (WHIM) medium (about 43%) while at z =
Externí odkaz:
http://arxiv.org/abs/1111.2059
Publikováno v:
Astron.Astrophys.488:845-851,2008
(context) Different cosmological data are consistent with an accelerated expansion produced by an exotic matter-energy component, dubbed "dark-energy''. A cosmological constant is a possibility since it satisfies most of the observational constraints
Externí odkaz:
http://arxiv.org/abs/0806.4245
Publikováno v:
Phys.Rev.D77:064023,2008
The relativistic accretion rate of dark matter by a black hole is revisited. Under the assumption that the phase space density indicator, $Q=\rho_{\infty}/\sigma^3_{\infty}$, remains constant during the inflow, the derived accretion rate can be highe
Externí odkaz:
http://arxiv.org/abs/0802.2041
Publikováno v:
Phys.Rev. D74 (2006) 023001
Capture rates of compact objects were calculated by using a recent solution of the Fokker-Planck equation in energy-space, including two-body resonant effects. The fraction of compact objects (white dwarfs, neutron stars and stellar black holes) was
Externí odkaz:
http://arxiv.org/abs/astro-ph/0606427
Publikováno v:
Mon.Not.Roy.Astron.Soc.367:1011-1016,2006
Cosmological N-body simulations were performed to study the evolution of the phase-space density Q = rho/sigma^3 of dark matter halos. No significant differences in the scale relations Q ~ sigma^(-2.1) or Q ~ M^(-0.82) are seen for "cold" or "warm" d
Externí odkaz:
http://arxiv.org/abs/astro-ph/0512482