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5 papers · 2 filters
Averaging in LRS class II spacetimes
Petr Kaspar, Otakar Svitek
We generalize Buchert's averaged equations [Gen. Rel. Grav. 32, 105 (2000); Gen. Rel. Grav. 33, 1381 (2001)] to LRS class II dust model in the sense that all Einstein equations are…
Modelling Inhomogeneity in Szekeres Spacetime
David Vrba, Otakar Svitek
We study the behaviour of the density contrast in quasi-spherical Szekeres spacetime and derive its analytical behaviour as a function of and . We set up the inhomogeneity u…
Graphene and Black Holes: novel materials to reach the unreachable
Alfredo Iorio
The case for a dedicated laboratory, to test hep-th models on analogue systems, is briefly made. The focus is on graphene.
Static and radiating p-form black holes in the higher dimensional Robinson-Trautman class
Marcello Ortaggio, Jiri Podolsky, Martin Zofka
We study Robinson-Trautman spacetimes in the presence of an aligned p-form Maxwell field and an arbitrary cosmological constant in n>=4 dimensions. As it turns out, the character o…
Transformational acoustic metamaterials based on pressure gradients
C. García-Meca, S. Carloni, C. Barceló +3
We apply a homogenization process to the acoustic velocity potential wave equation. The study of various examples shows that the resulting effective properties are different from t…