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4 papers
Gravitational radiation from birefringent matter dynamics
Nils Alex
We present the second-order gravitational dynamics for a spacetime inhabited by matter fields which feature vacuum birefringence. The derivation follows a perturbative variant of t…
Solutions of gravitational field equations for weakly birefringent spacetimes
Nils Alex
The constructive gravity programme applied to electrodynamics with vacuum birefringence yields the---up to unknown gravitational constants---unique compatible gravity theory for th…
Covariant constructive gravity: A step-by-step guide towards alternative theories of gravity
Nils Alex, Tobias Reinhart
We propose a step-by-step manual for the construction of alternative theories of gravity, perturbatively as well as nonperturbatively. The construction is guided by no more than tw…
Covariant Constructive Gravity
Tobias Reinhart, Nils Alex
We present a method of constructing perturbative equations of motion for the geometric background of any given tensorial field theory. Requiring invariance of the gravitational dyn…