In part one of Effective Action in Quantum Gravity, the book describes the principles of
quantum field theory and the significance of and theory behind effective action. Part two …

Black holes are probably among the most fascinating objects populating our universe. Their
characteristic features found within general relativity, encompassing space–time …

This is the first of a series of papers which describe the functional-integral approach to the
study of the statistical and kinetic properties of nonequilibrium quantum fields in flat and …

In this report we introduce the basic techniques (of the closed-time-path (CTP) coarse-
grained effective action (CGEA)) and ideas (scaling, coarse-graining and backreaction) …

We study the evolution of light spectator fields in an asymmetric polynomial potential. During
inflation, stochastic fluctuations displace the spectator field from the global minimum of its …

We consider light scalar fields during inflation and show how the stochastic spectral
expansion method can be used to calculate two-point correlation functions of an arbitrary …

We show that the Hartle-Hawking vacuum for any theory of interacting massive scalars on a
fixed de Sitter background is both perturbatively well defined and stable in the IR …

The detection of gravitational waves in 2015 ushered in a new era of gravitational wave
(GW) astronomy capable of probing the strong field dynamics of black holes and neutron …

It is well known that the correlation functions of a scalar field in a quasi-de Sitter space
exhibit at the loop level cumulative infrared effects proportional to the total number of e …

We use {the spectral representation of} the stochastic Starobinsky-Yokoyama approach to
compute correlation functions in de Sitter space for a scalar field with a symmetric or …