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From cosmic deceleration to acceleration: new constraints from SN Ia and BAO/CMB

- R. Giostri, M. D. Santos, I. Waga, R. Reis, M. Calvao, B. Lago
- Physics
- 14 March 2012

We use type Ia supernovae (SN Ia) data in combination with recent baryonic acoustic oscillations (BAO) and cosmic microwave background (CMB) observations to constrain a kink-like parametrization of… Expand

Dark Interactions and Cosmological Fine-Tuning

- M. Quartin, M. Calvao, S. E. Jor'as, R. Reis, I. Waga
- Physics
- 5 February 2008

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 have been studied,… Expand

On the thermodynamics of matter creation in cosmology

Abstract The recent phenomenological approach to the process of matter creation in the cosmological context, as proposed by Prigogine and collaborators, is reexamined within a manifestly covariant… Expand

Type Ia supernova parameter estimation: a comparison of two approaches using current datasets

- B. Lago, M. Calvao, S. E. Jor'as, R. Reis, I. Waga, R. Giostri
- Physics
- 14 April 2011

We compare the traditional χ 2 and complete-likelihood approaches for determining parameter constraints from type Ia supernovae (SNe Ia) when the magnitude dispersion is to be estimated as well. The… Expand

Probing the dark energy with quasar clustering.

- M. Calvao, Joao R. T. de Mello Neto, I. Waga
- Physics, MedicinePhysical review letters
- 2 July 2001

TLDR

Taub’s plane-symmetric vacuum spacetime reexamined

- M. L. Bedran, M. Calvao, I. Soares, F. M. Paiva
- Physics
- 23 August 1996

The gravitational properties of the only static plane-symmetric vacuum solution of Einstein’s field equations without cosmological term (Taub’s solution, for brevity) are presented: some already… Expand

1122 Characteristic functions and higher order Lagrangians 1127 Notes on a class of homogeneous space-times

- M. Fecko, O. García-Prada, +18 authors S. Sadowski
- Mathematics
- 1 May 1988

The breakdown of causality in homogeneous Godel‐type space‐time manifolds is examined. An extension of Reboucas–Tiomno (RT) and Accioly–Goncalves studies is made. The existence of noncausal curves is… Expand

Standardization of type Ia supernovae

- R. C. V. Coelho, M. Calvao, R. Reis, B. B. Siffert
- Physics
- 13 November 2014

Type Ia supernovae (SNe Ia) have been intensively investigated due to its great homogeneity and high luminosity, which make it possible to use them as standardizable candles for the determination of… Expand

Temperature Evolution Law of Imperfect Relativistic Fluids

The first-order general relativistic theory of a generic dissipative (heat-conducting, viscous, particle-creating) fluid is rediscussed from a unified covariant frame-independent point of view. By… Expand

Extended thermodynamics of Friedmann-Robertson-Walker models in the Landau-Lifshitz frame

The authors study dissipative Friedmann-Robertson-Walker (FRW) models with the help of the relativistic extended thermodynamics as formulated in the Landau-Lifshitz (energy) frame. The physically… Expand

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