681 citations · 4.4k across the 93 of their papers we have counts for
94 papers
The problem of time: a path integral view
Juan Manuel Diaz, Alejandro Perez
We show that the emergence of time evolution in an otherwise timeless nonrelativistic closed quantum system -- viewed as a poor man's model of generally covariant quantum theory --…
Renormalization of the Quantum Stress Tensor Fluctuations and the Limits of Semiclassical Gravity
Alejandro Perez, Daniel Sudarsky
We analyze the expectation value of the energy-momentum tensor and its fluctuations in quantum field theory on curved spacetimes . A generally accepeted con…
Black Hole Entropy and Planckian Discreteness
Alejandro Perez
A brief overview of the discovery that macroscopic black holes are thermodynamical systems is presented. They satisfy the laws of thermodynamics and are associated with a temperatu…
A clarification on prevailing misconceptions in unimodular gravity
Gabriel R. Bengochea, Gabriel Leon, Alejandro Perez +1
The traditional presentation of Unimodular Gravity (UG) consists on indicating that it is an alternative theory of gravity that restricts the generic diffeomorphism invariance of G…
Light-cone thermodynamics: purification of the Minkowski vacuum
Alejandro Perez, Salvatore Ribisi
We explicitly express the Minkowski vacuum of a massless scalar field in terms of the particle notion associated with suitable spherical conformal killing fields. These fields are…
Discreteness Unravels the Black Hole Information Puzzle: Insights from a Quantum Gravity Toy Model
Alejandro Perez, Sami Viollet
The black hole information puzzle can be resolved if two conditions are met. Firstly, if the information of what falls inside a black hole remains encoded in degrees of freedom tha…