Modifying Gravity in the Infra-Red by imposing an Ultra-Strong equivalence principle.

APA

Piazza, F. (2009). Modifying Gravity in the Infra-Red by imposing an Ultra-Strong equivalence principle.. Perimeter Institute for Theoretical Physics. https://pirsa.org/04050000

MLA

Piazza, Federico. Modifying Gravity in the Infra-Red by imposing an Ultra-Strong equivalence principle.. Perimeter Institute for Theoretical Physics, May. 27, 2009, https://pirsa.org/04050000

BibTex

          @misc{ scivideos_PIRSA:04050000,
            doi = {10.48660/04050000},
            url = {https://pirsa.org/04050000},
            author = {Piazza, Federico},
            keywords = {Quantum Gravity, Quantum Fields and Strings, Particle Physics, Cosmology},
            language = {en},
            title = {Modifying Gravity in the Infra-Red by imposing an Ultra-Strong equivalence principle.},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2009},
            month = {may},
            note = {PIRSA:04050000 see, \url{https://scivideos.org/pirsa/04050000}}
          }
          

Federico Piazza Centre de Physique Théorique

Abstract

I will give account of a work in progress in which I attempt to modify the metric-manifold structure of GR in the infra-red. The proposed modification does not contain any massive parameter as it is effective at length scales comparable with the inverse (extrinsic) curvature. The guiding line for this modification is an "ultra-strong" equivalence principle, according to which even semi-classical gravitational effects (i.e. particle production) are definitely banned from a sufficiently small free-falling elevator. Some cosmological consequences of this modification will be discussed.