Weak measurements, decoherence and cosmology

          @misc{ scivideos_PIRSA:17060029,
            doi = {10.48660/17060029},
            url = {https://pirsa.org/17060029},
            author = {Altamirano, Natacha},
            keywords = {Other Physics},
            language = {en},
            title = {Weak measurements, decoherence and cosmology},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2017},
            month = {jun},
            note = {PIRSA:17060029 see, \url{https://scivideos.org/index.php/pirsa/17060029}}
          }
          

Abstract

In this work we consider a recent proposal in which gravitational interactions are mediated via the exchange of classical information and apply it to a quantized Friedman-Robertson-Walker (FRW) universe with the assumption that any test particles must feel a classical metric. We show that such a model results in decoherence in the FRW state that manifests itself as a dark energy fluid that fills the spacetime. Motivated by quantum-classical interactions this model is yet another example of theories with violation of energy-momentum conservation whose signature could have significant consequences for the observable universe.