This investigation delves into the ringdown signals produced by semiclassical stars, which
are ultra-compact, regular solutions of the Einstein equations incorporating stress-energy …

In this paper, we consider a quantum scalar field propagating on the Reissner-Nordström
black hole spacetime. We compute the renormalized stress-energy tensor for the field in the …

We study the backreaction of a quantum scalar field on anti–de Sitter (AdS) spacetime. The
renormalized expectation value of the stress-energy tensor operator for a massless …

We investigate the effects of quantum backreaction on the Schwarzschild geometry in the
semiclassical approximation. The renormalized stress-energy tensor (RSET) of a scalar field …

The backreaction of quantum fields in their vacuum state results in equilibrium structures that
surpass the Buchdahl compactness limit. Such backreaction is encapsulated in the vacuum …

In this talk, I discuss the theory of the covariant Klein Gordon equation,(□ g+ m 2)∅= 0, on
the class of globally hyperbolic spacetimes (M, g).(Here globally hyperbolic means there …

Abstract Standard General Relativity assumes that, in the absence of classical matter
sources, spacetime is empty. This chapter considers and analyses the new behaviours of …

We investigate quasi-free Hadamard states defined via characteristic initial data on null
cones centred at the axis of symmetry in spherically symmetric space-times. We characterize …

We study the canonical quantization of a massive scalar field on a five dimensional, rotating
black hole space-time. We focus on the case where the space-time is asymptotically anti-de …

Cosmic censorship protects the outside world from black hole singularities and paves the
way for assigning entropy to gravity at the event horizons. We point out a tension between …