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30 papers · 1 filter
Stability of a modified Jordan-Brans-Dicke theory in the dilatonic frame
Genly Leon, Andronikos Paliathanasis, Luisberis Velazquez Abad
We investigate the Jordan-Brans-Dicke action in the cosmological scenario of FLRW spacetime with zero spatially curvature and with an extra scalar field minimally coupled to gravit…
Reduced Lagrangians and analytic solutions in Einstein-æther Cosmology
M. Roumeliotis, A. Paliathanasis, Petros A. Terzis +1
We present the solution space of the field equations in the Einstein-æther theory for the case of a and a LRS Bianchi Type space-time. We also find that there are port…
An increasing sequence of lower bounds for the Estrada index of graphs and matrices
Juan R. Carmona, Jonnathan Rodríguez
Let be a graph on vertices and its eigenvalues. The Estrada index of is defined as In this work, we usin…
New lower bounds for the Estrada and Signless Laplacian Estrada Index of a Graph
Juan L. Aguayo, Juan R. Carmona, Jonnathan Rodríguez
Let be a graph on vertices and its eigenvalues. The Estrada index of is defined as In this work, using a different de…
Szekeres Universes with Homogeneous Scalar Fields
John D. Barrow, Andronikos Paliathanasis
We consider the existence of an "inflaton" described by an homogeneous scalar field in the Szekeres cosmological metric. The gravitational field equations are reduced to two famili…
The past and future dynamics of quintom dark energy models
Genly Leon, Andronikos Paliathanasis, Jorge Luis Morales-Martínez
We study the phase space of the quintom cosmologies for a class of exponential potentials. We combine normal forms expansions and the center manifold theory in order to describe th…