2 papers
gr-qc2026
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 --…
gr-qc2026
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…