From the 2 of 17 linked papers with an AI index.
10 papers · 1 filter
Accelerating Universe from Constraints
Anamaria Hell, Misao Sasaki
The paper proposes a framework of constrained scalar fields with non‑minimal coupling that can drive cosmic acceleration independently of the cosmological constant, and analyzes it…
Wick-connected theories and Lorentz violation
Niklas Götzberger, Anamaria Hell
We consider double Wick rotation in field theories, which analytically continues the time coordinate, and then reinterprets one of the spatial directions as the new Lorentzian time…
How to deal with conformal and pure scale-invariant theories of gravity in d dimensions?
Anamaria Hell, Dieter Lust
Conformally-invariant and pure, scale-invariant theories of gravity are particularly interesting in four or higher dimensions. Yet, in contrast to their four-dimensional counterpar…
Branching Universes
Anamaria Hell, Tatsuya Daniel
We propose the idea that our Universe is a realization among different possible branches, which can be observationally tested through the modified dispersion relation of the gravit…
Pathologies of dimension-zero scalar fields
James M. Cline, Anamaria Hell
It has been claimed in a series of papers that scalar fields with a fourth-order Lagrangian can solve the cosmological constant problem by canceling the loop contr…
On the Kalb-Ramond field with non-minimal coupling to gravity
Anamaria Hell, Ippei Obata
We consider a massive Kalb-Ramond field with a general non-minimal coupling to gravity. We first study the theory in flat space-time, taking into account the non-linearities. We sh…