8 citations · 9 across the 6 of their papers we have counts for
7 papers
Gravitational entropy in Petrov Type I spacetimes
Maharshi Sarma, Sebastián Nájera, Roberto A. Sussman
The gravitational entropy proposal of Clifton, Ellis and Tavakol (CET) is based on an effective energy momentum tensor formed by the algebraic decomposition of the 4th order Bel-Ro…
Peculiar velocity fields from analytic solutions of General Relativity
Roberto A. Sussman, Sebastián Nájera, Fernando A. Pizaña +1
Peculiar velocities are analyzed through cosmological perturbations in the Newtonian longitudinal gauge characterized by irrotational shear-free congruences in an Eulerian frame. W…
Revisiting the gravitational "arrow of time"
Roberto A. Sussman, Sebastián Nájera, Fernando A. Pizaña +1
We address a long-standing misperception on the gravitational ``arrow of time'', a proposal by Penrose (also known as the ``Weyl-curvature hypothesis") that associates structure fo…
Gravitational entropy of fluids with energy flux
Roberto A. Sussman, Sebastián Nájera, Fernando A. Pizaña +1
We examine gravitational entropy growth within the formalism of Clifton, Ellis and Tavakol (CET) applied to a class of spherically symmetric exact solutions whose source is a shear…
Second Response to the critique of "Cotton Gravity''
R. A. Sussman, C. A. Mantica, L. G. Molinari +1
Clement and Noiucer submitted a note {\tt arXiv:2401.16008 [gr-qc]} replying to our criticism {\tt arXiv:2401.10479 [gr-qc]} of their previous submission. We reply to the contents…
Response to a critique of "Cotton Gravity"
Roberto A Sussman, Carlo Alberto Mantica, Luca Guido Molinari +1
We address in this article the criticism in a recently submitted article by Clement and Noiucer (arXiv:2312.17662 [gr-qc]) on "Cotton Gravity" (CG), a gravity theory alternative to…
Pancakes as opposed to Swiss Cheese
Sebastián Nájera, Roberto A. Sussman
We examine a novel class of toy models of cosmological inhomogeneities by smoothly matching along a suitable hypersurface an arbitrary number of sections of "quasi flat" inhomogeou…