31 citations · 73 across the 5 of their papers we have counts for
5 papers
Circular Orbits under Central Forces in Special Relativity
J M Aguirregabiria, A Hernández, M Rivas
We discuss the existence and stability of circular orbits of a relativistic point particle moving in a central force field. The stability condition is somewhat more restrictive in…
Comparing metrics at large: harmonic vs quo-harmonic coordinates
J. M. Aguirregabiria, Ll. Bel, J. Martin +2
To compare two space-times on large domains, and in particular the global structure of their manifolds, requires using identical frames of reference and associated coordinate condi…
Assisted inflation in Friedmann-Robertson-Walker and Bianchi spacetimes
J. M. Aguirregabiria, A. Chamorro, L. P. Chimento +1
We use exact general solutions for the spatially flat FRW and the anisotropic Bianchi I cosmologies to show that generically uncoupled scalar fields cooperate to make inflation mor…
Regular order reductions of ordinary and delay-differential equations
J. M. Aguirregabiria, Ll. Bel, A. Hernandez +1
We present a C program to compute by successive approximations the regular order reduction of a large class of ordinary differential equations, which includes evolution equations i…
Exponential-Potential Scalar Field Universes II: The Inhomogeneous Models
J. M. Aguirregabiria, A. Feinstein, J. Ibanez
We obtain exact solutions for the Einstein equations with an exponential-potential scalar field (\(V=Λe^{kϕ}\)) which represent simple inhomogeneous generalizations of Bianchi I co…