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10 papers · 1 filter
Vector models of gravitational Lorentz symmetry breaking
Michael D. Seifert
Spontaneous Lorentz symmetry breaking can occur when the dynamics of a tensor field cause it to take on a non-zero expectation value in vacuo, thereby providing one or more "prefer…
Prospects for Large Relativity Violations in Matter-Gravity Couplings
Alan Kostelecky, Jay Tasson
Deviations from relativity are tightly constrained by numerous experiments. A class of unmeasured and potentially large violations is presented that can be tested in the laboratory…
A variational formulation of relativistic hydrodynamics
Nikodem J. Poplawski
We combine Taub's and Ray's variational approaches to relativistic hydrodynamics of perfect fluids into another simple formulation.
Variational formulation of Eisenhart's unified theory
Nikodem J. Poplawski
Eisenhart's classical unified field theory is based on a non-Riemannian affine connection related to the covariant derivative of the electromagnetic field tensor. The sourceless fi…
Possible Equilibria of Interacting Dark Energy Models
Micheal S. Berger, Hamed Shojaei
Interacting dark energy and the holographic principle offer a possible way of addressing the cosmic coincidence problem as well as accounting for the size of the dark energy compon…
The Maxwell Lagrangian in purely affine gravity
Nikodem J. Poplawski
The purely affine Lagrangian for linear electrodynamics, that has the form of the Maxwell Lagrangian in which the metric tensor is replaced by the symmetrized Ricci tensor and the…