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- National Institute for Subatomic PhysicsNL871 papers
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23 papers · 2 filters
The Coincidence Limit of the Graviton Propagator in de Donder Gauge on de Sitter Background
E. O. Kahya, S. P. Miao, R. P. Woodard
We explicitly work out the de Sitter breaking contributions to the recent solution for the de Donder gauge graviton propagator on de Sitter. We also provide explicit power series e…
Towards singularity and ghost free theories of gravity
Tirthabir Biswas, Erik Gerwick, Tomi Koivisto +1
We present the most general covariant ghost-free gravitational action in a Minkowski vacuum. Apart from the much studied f(R) models, this includes a large class of non-local actio…
Quantum astrometric observables I: time delay in classical and quantum gravity
Igor Khavkine
A class of diffeomorphism invariant, physical observables, so-called astrometric observables, is introduced. A particularly simple example, the time delay, which expresses the diff…
Effective relational dynamics of a nonintegrable cosmological model
Philipp A Hoehn, Emilia Kubalova, Artur Tsobanjan
We apply the effective approach to evaluating semiclassical relational dynamics to the closed Friedman--Robertson--Walker cosmological model filled with a minimally coupled massive…
Effective relational dynamics
Philipp A. Hoehn
We provide a synopsis of an effective approach to the problem of time in the semiclassical regime. The essential features of this new approach to evaluating relational quantum dyna…
Canonical formalism for simplicial gravity
Philipp A. Hoehn
We summarise a recently introduced general canonical formulation of discrete systems which is fully equivalent to the covariant formalism. This framework can handle varying phase s…