Cosmology from the vacuum


Van Raamsdonk, M. (2022). Cosmology from the vacuum. Perimeter Institute. https://pirsa.org/22040128


Van Raamsdonk, Mark. Cosmology from the vacuum. Perimeter Institute, Apr. 26, 2022, https://pirsa.org/22040128


          @misc{ pirsa_PIRSA:22040128,
            doi = {10.48660/22040128},
            url = {https://pirsa.org/22040128},
            author = {Van Raamsdonk, Mark},
            keywords = {Quantum Fields and Strings},
            language = {en},
            title = {Cosmology from the vacuum},
            publisher = {Perimeter Institute},
            year = {2022},
            month = {apr},
            note = {PIRSA:22040128 see, \url{https://pirsa.org}}

Mark Van Raamsdonk University of British Columbia


We suggest a framework for cosmology based on gravitational effective field theories with a negative fundamental cosmological constant, which may exhibit accelerated expansion due to the positive potential energy of rolling scalar fields. The framework postulates an exact time-reversal symmetry of the quantum state (with a time-symmetric big bang / big crunch background cosmology) and an analyticity property that relates cosmological observables to observables in a Euclidean gravitational theory defined with a pair of asymptotically AdS planar boundaries. The latter can be given a microscopic definition using holography, so the model is UV complete. While it is not yet clear whether the framework can give realistic predictions, it has the potential to resolve various naturalness puzzles without the need for inflation.

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