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We discuss the challenges of motivating, constructing, and quantizing a canonically normalized inflationary perturbation in spatially curved universes.
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2015
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A. Scacco and A. Albrecht, Transients in finite inflation, Physical Review D 92
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B. Bonga, B. Gupt, and N. Yokomizo, Inflation in the closed FLRW model and the CMB, Journal of Cosmology and Astroparticle Physics 2016
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B. Bonga, B. Gupt, and N. Yokomizo, Tensor perturbations during inflation in a spatially closed Universe, Journal of Cosmology and Astroparticle Physics 2017
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2009
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E. Ramirez and D. J. Schwarz, ϕ 4 \phi^{4} inflation is not excluded, Physical Review D 80
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C. Destri, H. J. de Vega, and N. G. Sanchez, Preinflationary and inflationary fast-roll eras and their signatures in the low CMB multipoles, Physical Review D 81
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S. Unnikrishnan and L. Sriramkumar, A note on perfect scalar fields, Phys. Rev. D 81
2010
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G. R. Bengochea and G. León, Novel vacuum conditions in inflationary collapse models, Physics Letters B 774
2017
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Planck Collaboration, Planck 2018 results. I. Overview and the cosmological legacy of Planck, Astronomy & Astrophysics 641
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Planck Collaboration, Planck 2018 results. V. CMB power spectra and likelihoods, Astronomy & Astrophysics 641
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Planck Collaboration, Planck 2018 results. VI. Cosmological parameters, Astronomy & Astrophysics 641
2018
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Planck Collaboration, Planck 2018 results. X. Constraints on inflation, Astronomy & Astrophysics 641
2019
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E. Di Valentino, A. Melchiorri, and J. Silk, Planck evidence for a closed Universe and a possible crisis for cosmology, Nature Astronomy , 1 (2019)
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2019
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G. Efstathiou and S. Gratton, The evidence for a spatially flat Universe, Monthly Notices of the Royal Astronomical Society: Letters 496
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G. Ellis and J. Larena, The case for a closed universe, Astronomy & Geophysics 61
2020
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J. Grain and V. Vennin, Canonical transformations and squeezing formalism in cosmology, Journal of Cosmology and Astroparticle Physics 2020
2020
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H. V. Ragavendra, D. Chowdhury, and L. Sriramkumar, Unique Contributions to the Scalar Bispectrum in ‘Just Enough Inflation’, in Workshop on Frontiers in High Energy Physics 2019 , edited by A. Giri and R. Mohanta (Springer, Singapore, 2020) pp. 39–47
2020
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2021
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2022
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2022
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2022
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C. Kiefer and T. Vardanyan, Power spectrum for perturbations in an inflationary model for a closed universe, General Relativity and Gravitation 54
2022
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A. Ferreiro and S. Pla, Adiabatic regularization and preferred vacuum state for the λ ϕ 4 \lambda{\phi}^{4} field theory in cosmological spacetimes, Phys. Rev. D 106
2022
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