85 citations · 791 across the 43 of their papers we have counts for
6 papers · 1 filter
Gravitational Rutherford scattering and Keplerian orbits for electrically charged bodies in heterotic string theory
J. R. Villanueva, Marco Olivares
Properties of the motion of electrically charged particles in the background of the Gibbons-Maeda-Garfinkle-Horowitz-Strominger (GMGHS) black hole is presented in this paper. Radia…
Photon spheres in Einstein and Einstein-Gauss-Bonnet theories and circular null geodesics in axially-symmetric spacetimes
Emanuel Gallo, J. R. Villanueva
In this article we extend a recent theorem proven by Hod (Phys. Lett. B, {\bf 727}, 345--348, 2013) to -dimensional Einstein and Einstein-Gauss-Bonnet theories, which gives an u…
A Jacobian generalization of the pseudo Nambu-Goldstone bosons potential
W. S. Hipólito-Ricaldi, J. R. Villanueva
We enlarge the classes of inflaton and quintessence fields by generalizing the pseudo Nambu--Goldstone boson potential by means of elliptic Jacobian functions, which are characteri…
A Jacobian elliptic single-field inflation
J. R. Villanueva, Emanuel Gallo
In the scenario of single-field inflation, this field is done in terms of Jacobian elliptic functions. This approach provides, when constrained to particular cases, analytic soluti…
The generalized Chaplygin-Jacobi gas
J. R. Villanueva
The present paper is devoted to find a new generalization of the generalized Chaplygin gas. Therefore, starting from the Hubble parameter associated to the Chaplygin scalar field a…
Testing a dissipative kinetic k-essence model
V. H. Cardenas, N. Cruz, J. R. Villanueva
In this work, we present a study of a purely kinetic k-essence model, characterized basically by a parameter in presence of a bulk dissipative term, whose relationship between…