We construct a closed string field theory in the proper-time gauge which is the closed analog of the deformed cubic open string field theory and define the general closed string scattering amplitudes. Taking the zero-slope limit, we explicitly evaluate the three-graviton scattering amplitudes and the four-graviton scattering amplitudes. We discuss in the framework of the closed string field...
Causal Dynamical Triangulations (CDT) is a lattice field theory of quantum gravity based on Regge calculus which can be studied using Monte Carlo techniques. The key feature of CDT is an introduction of a global proper time foliation into spatial hypersurfaces and a requirement that spatial topology is fixed. Measurements showed that CDT parametrized by bare coupling constants of the Regge...
The concept of a field theory with nonlinear phase space has recently been introduced, inspired by nontrivial geometry of the particles' phase spaces appearing in several approaches to quantum gravity. In particular, it has been applied in the context of cosmological inflation, by considering a scalar field theory with spherical phase space, defined on the standard FRW background (i.e. general...
In this presentation, we investigate the information flow of two-dimensional moving mirrors. Here we point out that various mirror trajectories can help to mimic different candidate resolutions to the information loss paradox following the semi-classical quantum field theory: (i) a suddenly stopping mirror corresponds to the assertion that all information is attached to the last burst, (ii) a...
The so-called state of silence has been obtained as a possible
consequence of deformed space-time structure in the models
of loop quantum gravity. The purpose of the talk is to provide
up to date status of the state of silence in cosmology. Our attention
will be focused on discussing possibility of solving various
cosmological problems employing the state of silence. In particular,
the...
