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gr-qc2009
A Lemaitre-Tolman-Friedmann Universe without Dark Energy
Stefano Viaggiu
We build a simple cosmological model by means of a parabolic Lemaître-Tolman-Bondi (LTB) metric up to a redshift , an hyperbolic Friedmann metric for up to…
gr-qc2003
A technique for generating new solutions of Einstein's equations
Roberto Bergamini, Stefano Viaggiu
We present a simple technique for generating new solutions of Einstein's equations using such function transformations that leave the field equations in the Ernst form. In this con…