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Population III microquasars
(World Scientific, 2018-07)
We present the first results obtained in the elaboration of a complete model of a microquasar where the donor star is from Population III. These stars do not produce stellar winds so we consider that the mass loss is due ...
Cosmic evolution of dark energy in a generalized Rastall gravity
(Springer, 2020-06-20)
In this work, we propose a scheme for cosmic evolution in a generalized Rastall gravity. In our approach, the role of dark energy is taken by the non-conserved sector of the stress energy-momentum tensor. The resultant ...
Non-Abelian S-term dark energy and inflation
(2018-03)
We study the role that a cosmic triad in the generalized SU(2) Proca theory, specifically in one of the
pieces of the Lagrangian that involves the symmetric version Sμν of the gauge field strength tensor Fμν,
has on dark ...
An accelerating cosmology without dark energy
(IOP PUBLISHING LTD, 2009)
The negative pressure accompanying gravitationally-induced particle creation can lead to a cold dark matter (CDM) dominated, accelerating Universe (Lima et al. 1996 [1]) without requiring the presence of dark energy or a ...
Model for Population III microquasars
(EDP Sciences, 2019-09)
Current simulations indicate that the first stars were formed predominantly in binary systems. The study of the contribution of the first accreting binary systems to the reionization and heating of the intergalactic medium ...
From de sitter to de sitter: a non-singular inflationary universe driven by vacuum
(International Journal of Modern Physics D, 2006)
A semi-classical analysis of vacuum energy in the expanding space–time suggests that
the cosmological term decays with time, with a concomitant matter production. For
early times we find, in Planck units, Λ ≈ H4, where H ...