Candidate theories of quantum gravity are widely expected to resolve the singularities predicted by general relativity. In the absence of a complete theory, singularity-free models — often referred to as regular black holes — have emerged as a compelling alternative, sidestepping the problematic causal structure of their classical counterparts. A rather ubiquitous prediction across various...
Quantum field theory in curved spacetime famously predicts that information is lost as a black hole evaporates through Hawking radiation. While many resolutions have been proposed, we consider the role of singularities in black hole evaporation. This talk will present a general model of evaporating black holes in 2D dilaton gravity, with a focus on a Bardeen-like regular black hole model. The...
In their seminal 1992 paper, Bañados, Teitelboim and Zanelli (BTZ) proposed a simple charged generalization of what is now known as the spinning BTZ black hole. However, it soon became clear that this spacetime does not satisfy Maxwell equations and was thus discarded. In this talk, we will see that this incorrect original BTZ metric can actually be redeemed - it can be interpreted as a...
In this talk I will discuss how modelling local, nonperturvative measurements in relativistic field theories has traditionally led to a choice between mathematical untractability and frictions with covariance, locality and causality. In this context I will argue that there is a class of detector models in which nonperturbative, local and convariant, as well as mathematically tractable results...
Black holes provide a setting to test assumptions about the interplay of quantum theory and gravity. These tests have led to several puzzles, such as the xeroxing or firewall paradox. A common feature of these puzzles is that they combine the perspectives of an infalling observer and an exterior observer, who, for fundamental reasons, have access to different systems. In quantum foundations,...
The equivalence principle imposes stringent constraints on both kinematics and dynamics of the spacetime. In my talk, I discuss how these constraints manifest in the context of black hole thermodynamics. I introduce a thought experiment involving a small black hole which uncovers violations of the strong equivalence principle. I then explore its outcomes in several gravitational theories of...
Entanglement entropy in dynamical and quantum‑corrected black hole spacetimes offers a key diagnostic of quantum correlations across horizons, motivating studies of its scaling and time evolution near these critical surfaces. We investigate the entanglement entropy scaling with the horizon area in two settings. In the first analysis, we consider a massive scalar field with nonminimal curvature...
In recent years, extensive studies on quantum correlations in various scenarios, such as non-inertial frames, curved spacetime, and an expanding universe have been performed [1–7]. In the framework of the theory of open systems based on completely positive quantum dynamical semigroups, we investigate the time evolution of Gaussian quantum entanglement of two bosonic modes associated with a...
Unlike a classical charged bosonic field, a classical charged fermion field on a static charged black hole does not exhibit superradiant scattering. We demonstrate that the quantum analogue of this classical process is however present. We construct a vacuum state for the fermion field which has no incoming particles from past null infinity, but which contains, at future null infinity, a...
Computational quantum field theory (CQFT) has been successful in studying the pair production of electron-positron pairs resulting from colliding laser pulses—an effect yet to be observed. It has also been successful in studying the dynamics of Klein tunneling for fermions and bosons. We extend the framework of CQFT to curved spacetimes and use it to investigate the dynamics of fermionic and...
Hawking radiation is the most celebrated result of quantum field theory on a curved background. It completed the formulation of black hole thermodynamics and initiated the black hole information loss debate. Candidate theories of quantum gravity are required to demonstrate their way of entropy counting, indicate modifications to gravitational collapse, and take a stance on the issue of...
I will report on recent findings about the generation and distribution of entanglement in Quantum Electrodynamics (QED) scattering processes. The analysis takes advantage of the complete complementarity relations, which allow for a complete characterization of both local and nonlocal properties of these fundamental quantum processes. Remarkably, it is found that maximal entanglement is...
