O
Oliver F. Piattella
Researcher at Universidade Federal do Espírito Santo
Publications - 137
Citations - 2502
Oliver F. Piattella is an academic researcher from Universidade Federal do Espírito Santo. The author has contributed to research in topics: Scalar field & Dark matter. The author has an hindex of 27, co-authored 130 publications receiving 2199 citations. Previous affiliations of Oliver F. Piattella include Heidelberg University & National Council for Scientific and Technological Development.
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Lecture Notes in Cosmology
TL;DR: These lecture notes are based on the hand-written notes which I prepared for the cosmology course taught to graduate students of PPGFis and PPGCosmo at the Federal University of Espirito Santo (UFES) starting from 2014 as mentioned in this paper.
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Rastall cosmology
TL;DR: In this article, a self-interacting scalar field representation of the generalized Chaplygin gas model is proposed to fit observational data, which can be implemented in Rastall's theory of gravity, based on a modification of the usual matter conservation law.
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Bulk viscous cosmology with causal transport theory
TL;DR: In this paper, the authors consider cosmological scenarios originating from a single imperfect fluid with bulk viscosity and apply Eckart's and both the full and the truncated Muller-Israel-Stewart's theories as descriptions of the non-equilibrium processes.
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Finite-time singularities in f(R, T) gravity and the effect of conformal anomaly
TL;DR: In this paper, the authors investigate gravity models that are able to reproduce the four known types of future finite-time singularities and find that, even without taking into account conformal anomaly, the big rip and the type III singularity may be removed thanks to the presence of the $T$ contribution of the gravity model.
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Static, spherically symmetric solutions with a scalar field in Rastall gravity
TL;DR: In this paper, a canonical scalar field is coupled to the gravity sector in Rastall's theory, and new exact solutions appear for some values of the rastall parameter a. Some of these solutions describe the same space-time geometry as the recently found solutions in the k-essence theory with a power function for the kinetic term of the scalar fields.