The quantum break-time of a system is the time-scale after which its true quantum evolution
departs from the classical mean field evolution. For capturing it, a quantum resolution of the …

Gravitational backgrounds, such as black holes, AdS, de Sitter and inflationary universes,
should be viewed as composite of N soft constituent gravitons. It then follows that such …

We review some features of Bose–Einstein condensate (BEC) models of black holes
obtained by means of the horizon wave function formalism. We consider the Klein–Gordon …

We consider a solution of the effective four-dimensional Einstein equations, obtained from
the general relativistic Schwarzschild metric through the principle of Minimal Geometric …

We establish a connection between the ultra-Planckian scattering amplitudes in field and
string theory and unitarization by black hole formation in these scattering processes. Using …

Recently a quantum portrait of black holes was suggested according to which a macroscopic
black hole is a Bose–Einstein condensate of soft gravitons stuck at the critical point of a …

A bstract We discuss BMS supertranslations both at null-infinity BMS− and on the
horizon\({\mathrm {BMS}}^{\mathrm {\mathscr {H}}}\) for the case of the Schwarzschild black …

In some instances of study of quantum evolution of classical backgrounds it is considered
inevitable to resort to nonperturbative methods at the price of treating the system …

We study an effective quantum description of the static gravitational potential for spherically
symmetric systems up to the first post-Newtonian order. We start by obtaining a Lagrangian …

Due to the inevitable existence of quantum effects, a classical description generically breaks
down after a finite quantum break‐time tq t_q. We aim to find criteria for determining tq t_q …