317 citations · 2.6k across the 36 of their papers we have counts for
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Hamiltonian theory for the axial perturbations of a dynamical spherical background
David Brizuela, Jose M. Martin-Garcia
We develop the Hamiltonian theory of axial perturbations around a general time-dependent spherical background spacetime. Using the fact that the linearized constraints are gauge ge…
xPert: Computer algebra for metric perturbation theory
David Brizuela, Jose M. Martin-Garcia, Guillermo A. Mena Marugan
We present the tensor computer algebra package xPert for fast construction and manipulation of the equations of metric perturbation theory, around arbitrary backgrounds. It is base…
xPerm: fast index canonicalization for tensor computer algebra
Jose M. Martin-Garcia
We present a very fast implementation of the Butler-Portugal algorithm for index canonicalization with respect to permutation symmetries. It is called xPerm, and has been written a…
The Invar tensor package: Differential invariants of Riemann
Jose M. Martin-Garcia, David Yllanes, Renato Portugal
The long standing problem of the relations among the scalar invariants of the Riemann tensor is computationally solved for all 6x10^23 objects with up to 12 derivatives of the metr…