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10 papers · 1 filter
Singular inflation from generalized equation of state fluids
S. Nojiri, S. D. Odintsov, V. K. Oikonomou
We study models with a generalized inhomogeneous equation of state fluids, in the context of singular inflation, focusing to so-called Type IV singular evolution. In the simplest c…
Fourth derivative gravity in the auxiliary fields representation and application to the black hole stability
Sebastiao Mauro, Roberto Balbinot, Alessandro Fabbri +1
We consider an auxiliary fields formulation for the general fourth-order gravity on an arbitrary curved background. The case of a Ricci-flat background is elaborated in full detail…
Cosmological inflation in gravity
Mariafelicia De Laurentis, Mariacristina Paolella, Salvatore Capozziello
Cosmological inflation is discussed in the framework of gravity where is a generic function of the curvature scalar and the Gauss-Bonnet topological invaria…
Interaction of hopfions of charge 1 and 2 from product ansatz
A. Acus, E. Norvaišas, Ya. Shnir
We continue the discussion on the interaction energy of the axially symmetric Hopfions evaluated directly from the product anzsatz. The Hopfions are given by the projection of Skyr…
The Cosmological Constant as an Eigenvalue of the Hamiltonian constraint in a Varying Speed of Light theory
Remo Garattini, Mariafelicia De Laurentis
In the framework of a Varying Speed of Light theory, we study the eigenvalues associated with the Wheeler-DeWitt equation representing the vacuum expectation values associated with…
Thermodynamic properties of asymptotically anti-de Sitter black holes in d=4 Einstein-Yang-Mills theory
Olga Kichakova, Jutta Kunz, Eugen Radu +1
We investigate the thermodynamics of spherically symmetric black hole solutions in a four-dimensional Einstein--Yang-Mills-SU(2) theory with a negative cosmological constant. Speci…