The Classicality Puzzle


Lehners, J. (2016). The Classicality Puzzle. Perimeter Institute. https://pirsa.org/16060009


Lehners, Jean-Luc. The Classicality Puzzle. Perimeter Institute, Jun. 14, 2016, https://pirsa.org/16060009


          @misc{ pirsa_PIRSA:16060009,
            doi = {10.48660/16060009},
            url = {https://pirsa.org/16060009},
            author = {Lehners, Jean-Luc},
            keywords = {Cosmology},
            language = {en},
            title = {The Classicality Puzzle},
            publisher = {Perimeter Institute},
            year = {2016},
            month = {jun},
            note = {PIRSA:16060009 see, \url{https://pirsa.org}}

Jean-Luc Lehners Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI) - Theoretical Cosmology


Why was the early universe classical? Along with the big bang singularity problem and the flatness, horizon and inhomogeneity puzzles, this is one of the big unexplained features of the hot big bang scenario. In this talk I will discuss how inflation and ekpyrosis, which have mainly been considered as models that can address some of the other puzzles, can both drive the early universe towards classicality. The remarkable aspect is that classicality is achieved via the intrinsic dynamics of inflation and ekpyrosis, without invoking decoherence.