PIRSA:14020137

Video URL

https://pirsa.org/14020137

Nonlocal cosmology

Woodard, R. (2014). Nonlocal cosmology. Perimeter Institute for Theoretical Physics. https://pirsa.org/14020137

Woodard, Richard. Nonlocal cosmology. Perimeter Institute for Theoretical Physics, Feb. 27, 2014, https://pirsa.org/14020137 

          @misc{ scivideos_PIRSA:14020137,
            doi = {10.48660/14020137},
            url = {https://pirsa.org/14020137},
            author = {Woodard, Richard},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Nonlocal cosmology},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2014},
            month = {feb},
            note = {PIRSA:14020137 see, \url{https://scivideos.org/pirsa/14020137}}
          }

Richard Woodard University of Florida

Talk numberPIRSA:14020137
DOI10.48660/14020137
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

I review a class of nonlocally modified gravity models which were proposed to explain the current phase of cosmic acceleration without dark energy. Among the topics considered are deriving causal and conserved field equations, adjusting the model to make it support a given expansion history, why these models do not require an elaborate screening mechanism to evade solar system tests, degrees of freedom and kinetic stability, and the negative verdict of structure formation. Although these simple models are not consistent with data on the growth of cosmic structures many of their features are likely to carry over to more complicated models which are in better agreement with the data.