169 citations · 487 across the 12 of their papers we have counts for
13 papers
Thermodynamics of Theories of Gravity
C. D. Peralta, S. E. Jorás
This paper starts from a toy model for inflation in a class of modified theories of gravity in the metric formalism. Instead of the standard procedure -- assuming a non-linear Lagr…
Type Ia supernova parameter estimation: a comparison of two approaches using current datasets
B. L. Lago, M. O. Calvão, S. E. Jorás +3
By using the Sloan Digital Sky Survey (SDSS) first year type Ia supernova (SN Ia) compilation, we compare two different approaches (traditional χ^2 and complete likelihood) to dete…
Viable Singularity-Free f(R) Gravity Without a Cosmological Constant
V Miranda, Sergio E. Joras, Ioav Waga +1
Several authors have argued that self-consistent gravity models distinct from CDM are almost ruled out. Confronting such claims, we present a particular two-parameter $f(…
Trans-Planckian Physics from a Nonlinear Dispersion Relation
S. E. Joras, G. Marozzi
We study a particular nonlinear dispersion relation -- a series expansion in the physical wavenumber -- for modeling first-order corrections in the equation of mot…
Dark Interactions and Cosmological Fine-Tuning
Miguel Quartin, Mauricio O. Calvao, Sergio E. Joras +2
Cosmological models involving an interaction between dark matter and dark energy have been proposed in order to solve the so-called coincidence problem. Different forms of coupling…
Entropy perturbations in quartessence Chaplygin models
R. R. R. Reis, I. Waga, M. O. Calvao +1
We show that entropy perturbations can eliminate instabilities and oscillations, in the mass power spectrum of the quartessence Chaplygin models. Our results enlarge the current pa…