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A Breathing Universe is Consistent
Samuel Blitz
We consider a toy FRW universe with the exotic topology . We show that for a specific choice of quantum field content, the semi-classical Friedman equations are con…
Unique Carrollian manifolds emerging from Einstein spacetimes
S. Blitz, D. McNutt, P. Nurowski
We explicitly determine all shear-free null hypersurfaces embedded in an Einstein spacetime, including vacuum asymptotically flat spacetimes. We characterize these hypersurfaces as…
Asymptotia of Kerr-de Sitter Black Holes
Samuel Blitz, JarosÅaw KopiÅski
Exterior geometries of physical black holes are believed to asymptotically approach the Kerr--de Sitter spacetime at late times. A characteristic feature of that vacuum Einstein so…
A long freeze is hard to achieve in the presence of matter
Samuel Blitz, Robert J. Scherrer, Oem Trivedi
Certain holographic dark energy (HDE) models allow for the possibility of a ``long freeze,'' in which the scale factor evolves to a constant in the long-time limit. Here we extend…
Curvature fluctuations in a baby quantum gravity model
Samuel Blitz, Shahn Majid
Understanding the microscopic behavior of spacetime is critical for developing a theory of quantum gravity and perhaps solving the cosmological constant problem. In this context, i…
Horizons that Gyre and Gimble: A Differential Characterization of Null Hypersurfaces
Samuel Blitz, David McNutt
Motivated by the thermodynamics of black hole solutions conformal to stationary solutions, we study the geometric invariant theory of null hypersurfaces. It is well-known that a nu…