301 citations · 2.1k across the 77 of their papers we have counts for
9 papers · 1 filter
{\it Gauging} the cosmic acceleration with recent type Ia supernovae data sets
Hermano Velten, Syrios Gomes, Vinicius C. Busti
We revisit a model-independent estimator for cosmic acceleration based on type Ia supernovae distance measurements. This approach does not rely on any specific theory for gravity,…
Cosmology from a new non-conservative gravity
Júlio C. Fabris, Hermano Velten, Thiago R. P. Caramês +2
In this paper we present a cosmological model arising from a non-conservative gravitational theory proposed in [PRD 95, 101501(R) (2017)]. The novel feature where comparing with pr…
Revealing the non-adiabatic nature of dark energy perturbations from galaxy clustering data
Hermano Velten, Raquel Fazolo
We study structure formation using relativistic cosmological linear perturbation theory in the presence of intrinsic and relative (with respect to matter) non-adiabatic dark energy…
Reply to Comment [arXiv:1707.00747] by P. H. R. S. Moraes, R. A. C. Correa and G. Ribeiro on "Cosmological inviability of gravity" [H. Velten and Thiago R. P. Caramês, Phys. Rev. D 95 (2017) 123536, arXiv:1702.07710]
Hermano Velten, Thiago Carames
In this Reply we reassert the failure of the model in providing a transition from deceleration to an accelerated stage as we have pointed out in [H. Velten and…
Matter growth in extended CDM cosmology
W. Zimdahl, H. E. S. Velten, W. C. Algoner
On the basis of a previously established scalar-tensor extension of the CDM model we develop an effective fluid approach for the matter growth function. This extended CDM (he…
Flavour composition and entropy increase of cosmological neutrinos after decoherence
Daniel Boriero, Dominik J. Schwarz, Hermano Velten
We propose that gravitational interactions of cosmic neutrinos with the statistically homogeneous and isotropic fluctuations of space-time leads to decoherence. This working hypoth…
Limits on the anomalous speed of gravitational waves from binary pulsars
Hermano Velten, Jose Beltrán Jiménez, Federico Piazza
A large class of modified theories of gravity used as models for dark energy predict a propagation speed for gravitational waves which can differ from the speed of light. This diff…
Cosmological inviability of gravity
Hermano Velten, Thiago R. P. Caramês
Among many alternative gravitational theories to General Relativity (GR), gravity (where is the Ricci scalar and the trace of the energy-momentum tensor) has been…
Assessing the impact of bulk and shear viscosities on large scale structure formation
C. M. S. Barbosa, H. Velten, J. C. Fabris +1
It is analyzed the effects of both bulk and shear viscosities on the perturbations, relevant for structure formation in late time cosmology. It is shown that shear viscosity can be…