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23 papers · 1 filter
Novel Realizations of Warp Drive Spacetimes as Solutions of General Relativity
Thomas Buchert, Antony Frackowiak
We first take a closer look at the original warp drive proposal by Alcubierre, examine its kinematics in the context of a covariant 3+1 setting, and explain some drawbacks of this…
Bianchi cosmologies in a Thurston-based theory of gravity
Quentin Vigneron, Hamed Barzegar
The strong interplay between Bianchi--Kantowski--Sachs (BKS) spacetimes and Thurston geometries motivates the exploration of the role of topology in our understanding of gravity. A…
On restrictions of current warp drive spacetimes and immediate possibilities of improvement
Hamed Barzegar, Thomas Buchert
Looking at current proposals of so-called `warp drive spacetimes', they appear to employ General Relativity only at an elementary level. A number of strong restrictions are imposed…
A natural model for curved inflation
Quentin Vigneron, Julien Larena
Inflationary models with a non-zero background curvature require additional hypothesis or parameters compared to flat inflation and the procedure to construct them cannot be as sim…
Splitting the spacetime: A systematic analysis of foliation dependence in cosmic averaging
Pierre Mourier, Asta Heinesen
It is a fundamental unsolved question in general relativity how to unambiguously characterize the effective collective dynamics of an ensemble of fluid elements sourcing the local…
Direct correspondence between Newtonian gravitation and general relativity
Thomas Buchert
We present a strategy to obtain equations of general relativity for an irrotational dust continuum within a flow-orthogonal foliation of spacetime from the equations of Newtonian g…