2009/04/30 by Federico Piazza, FEDERICO PIAZZA · 4 citations
Physics and Astronomy · #Curvature #Equivalence principle (geometric) #General relativity #Gravitation #Gravitational field #Noncommutative and Quantum Gravity Theories #Quantization (signal processing) #Quantum Electrodynamics and Casimir Effect #Quantum gravity #Relativity and Gravitational Theory #Semiclassical gravity #Semiclassical physics #astro-ph.CO #gr-qc #hep-th
paper · pdf · doi:10.1142/s0218271809016065
published in International Journal of Modern Physics D 18(14), 2181-2188 (World Scientific) · 9 pages, Honorable Mention at the Gravity Research Foundation Essay Competition
arxiv created 2009/07/04 · openalex publication_date 2009/12/31 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The equivalence principle suggests considering gravity as an infrared phenomenon, whose effects are visible only outside Einstein's free-falling elevator. By curving space–time, general relativity leaves the smallest systems free of classical gravitational effects. However, according to the standard semiclassical treatment, indirect effects of gravity can be experienced inside the elevator through the well-known mechanism of quantum particle production. Here we try a different path than the one historically followed: rather than imposing field quantization on top of a curved manifold, we attempt to upgrade the equivalence principle and extend it to the quantum phenomena. Therefore, we consider, and try to realize in a theoretical framework, a stronger version of the equivalence principle, in which all the effects of gravity are definitely banned from the elevator and confined to the infrared. For this purpose, we introduce infrared modified commutation relations for the global field operators (Fourier modes) that allow us to reabsorb the time-dependent quadratic divergence of the vacuum expectation value of the stress–energy tensor. The proposed modification is effective on length scales comparable to the inverse curvature and, therefore, does not add any dimensional parameter to the theory.