Zobrazeno 1 - 10
of 422
pro vyhledávání: '"J. A. de Freitas"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 5, Pp 1-6 (2019)
Abstract In a recent paper we have shown that a minimally coupled, self-interacting scalar field of mass m can form black holes of mass $$M=\sqrt{3}/(4m)$$ M=3/(4m) (in Planck units). If dark matter is composed by axions, they can form miniclusters t
Externí odkaz:
https://doaj.org/article/c87ca941dc6b4330a05f228e595809e2
Primordial black holes formed in an early post-inflation matter-dominated epoch during preheating provide a novel pathway for a source of the dark matter that utilizes known physics in combination with plausible speculations about the role of quantum
Externí odkaz:
http://arxiv.org/abs/2003.12072
Publikováno v:
Eur. Phys. J. C (2019) 79: 426
In a recent paper we have shown that a minimally coupled, self-interacting scalar field of mass $m$ can form black holes of mass $M=\sqrt{3}/(4m)$ (in Planck units). If dark matter is composed by axions, they can form miniclusters that for QCD axions
Externí odkaz:
http://arxiv.org/abs/1811.02289
Publikováno v:
JCAP 1602 (2016) no.02, 024
Effects of velocity dispersion of dark matter particles on the CMB TT power spectrum and on the matter linear power spectrum are investigated using a modified CAMB code. Cold dark matter originated from thermal equilibrium processes does not produce
Externí odkaz:
http://arxiv.org/abs/1507.00982
Two alternative theories to dark matter are investigated by testing their ability to describe consistently the dynamics of the Milky Way. The first one refers to a modified gravity theory having a running gravitational constant and the second assumes
Externí odkaz:
http://arxiv.org/abs/1501.01008
Publikováno v:
JCAP06(2014)038
The matter creation cosmology is revisited, including the evolution of baryons and dark matter particles. The creation process affects only dark matter and not baryons. The dynamics of the $\Lambda$CDM model can be reproduced only if two conditions a
Externí odkaz:
http://arxiv.org/abs/1405.6659
The cooler than expected optical-UV transient PS1-10jh detected by the Pan-STARRS1 survey is probably related to a tidal disruption event in which a He-rich stellar core remnant is implied. The evolution of bound debris during the disk phase is studi
Externí odkaz:
http://arxiv.org/abs/1212.1140
Observations suggest that relativistic particles play a fundamental role in the dynamics of jets emerging from active galactic nuclei as well as in their interaction with the intracluster medium. However, no general consensus exists concerning the ac
Externí odkaz:
http://arxiv.org/abs/1210.0749
A massive gravity theory was proposed by Visser in the late nineties. This theory, based on a backgroung metric $b_{\alpha \beta}$ and on an usual dynamical metric $g_{\alpha \beta}$ has the advantage of being free of ghosts as well as discontinuitie
Externí odkaz:
http://arxiv.org/abs/1109.6832
Autor:
Pacheco, J. A. de Freitas
The accretion of relativistic and non-relativistic fluids into a Reissner-Nordstr\"om black hole is revisited. The position of the critical point, the flow velocity at this point and the accretion rate are only slightly affected with respect to the S
Externí odkaz:
http://arxiv.org/abs/1109.6798