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From cosmic deceleration to acceleration: new constraints from SN Ia and BAO/CMB
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
Dark Interactions and Cosmological Fine-Tuning
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,
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
Type Ia supernova parameter estimation: a comparison of two approaches using current datasets
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
Probing the dark energy with quasar clustering.
The Alcock-Paczyński test, as applied to quasar clustering, is a powerful tool to probe the cosmological density and equation of state parameters Omega(m0), Omega(x0), and w and is competitive with future supernova and galaxy number count tests, besides being complementary to them.
Taub’s plane-symmetric vacuum spacetime reexamined
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
1122 Characteristic functions and higher order Lagrangians 1127 Notes on a class of homogeneous space-times
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
Standardization of type Ia supernovae
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
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
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