241 citations · 704 across the 43 of their papers we have counts for
9 papers · 1 filter
Twistors and antipodes in de Sitter space
Yasha Neiman
We develop the basics of twistor theory in de Sitter space, up to the Penrose transform for free massless fields. We treat de Sitter space as fundamental, as one does for Minkowski…
Action and entanglement in gravity and field theory
Yasha Neiman
In non-gravitational quantum field theory, the entanglement entropy across a surface depends on the short-distance regularization. Quantum gravity should not require such regulariz…
A look at area Regge calculus
Yasha Neiman
Area Regge calculus is a candidate theory of simplicial gravity, based on the Regge action with triangle areas as the dynamical variables. It is characterized by metric discontinui…
Polyhedra in spacetime from null vectors
Yasha Neiman
We consider convex spacelike polyhedra oriented in Minkowski space. These are the classical analogues of spinfoam intertwiners. We point out a parametrization of these shapes using…
The imaginary part of the gravitational action at asymptotic boundaries and horizons
Yasha Neiman
We study the imaginary part of the Lorentzian gravitational action for bounded regions, as described in arXiv:1301.7041. By comparing to a Euclidean calculation, we explain the agr…
The Wald entropy formula and loop quantum gravity
Norbert Bodendorfer, Yasha Neiman
We outline how the Wald entropy formula naturally arises in loop quantum gravity based on recently introduced dimension-independent connection variables. The key observation is tha…