Inflation story: Slow-roll and beyond

Hazra D.K. Paoletti D. Debono I. Shafieloo A. Smoot G. Starobinsky A.
December 2021 IOP Publishing Ltd

Journal of Cosmology and Astroparticle Physics
2021 #2021 Issue 12

We present constraints on inflationary dynamics and features in the primordial power spectrum of scalar perturbations using the Cosmic Microwave Background temperature, polarization data from Planck 2018 data release and updated likelihoods. We constrain the slow-roll dynamics using Hilltop Quartic Potential and Starobinsky R + R 2 model in the Einstein frame using the Planck 2018 binned Plik likelihood. Using the Hilltop as base potential, we construct Whipped Inflation potential to introduce suppression in the scalar power spectrum at large angular scales. We notice marginal (68% C.L.) preference of suppression from the large scale temperature angular power spectrum. However, large-scale E-mode likelihood based on high frequency instrument cross spectrum, does not support this suppression and in the combined data the preference towards the suppression becomes negligible. Based on the Hilltop and Starobinsky model, we construct the Wiggly Whipped Inflation potentials to introduce oscillatory features along with the suppression. We use unbinned data from the recently released CamSpec v12.5 likelihood which updates Planck 2018 results. We compare the Bayesian evidences of the feature models with their baseline slow-roll potentials. We find that the complete slow-roll baseline potential is moderately preferred against potentials which generate features. Compared to Planck 2015 PlikHM bin1 likelihood, we find that the significance of sharp features has decreased owing to the updates in the data analysis pipeline. We also compute the bispectra for the best fit candidates obtained from our analysis.

inflation , Inflation and CMBR theory , on-gaussianity

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The Institute of Mathematical Sciences, HBNI, CIT Campus, Chennai, 600113, India
INAF/OAS Bologna, Osservatorio di Astrofisica e Scienza Dello Spazio, Area della Ricerca CNR-INAF, via Gobetti 101, Bologna, I-40129, Italy
INFN, Sezione di Bologna, via Irnerio 46, Bologna, I-40127, Italy
AstroParticule et Cosmologie (APC), Paris Centre for Cosmological Physics, Université Paris Diderot, CNRS, CEA, Observatoire de Paris, Sorbonne Paris Cité University, 10, rue Alice Domon et Leonie Duquet, Cedex 13, Paris, 75205, France
Korea Astronomy and Space Science Institute, Daejeon, 34055, South Korea
University of Science and Technology, Daejeon, 34113, South Korea
Institute for Advanced Study and Physics Department, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
Energetic Cosmos Laboratory, Nazarbayev University, Astana, Kazakhstan
Donostia International Physics Center, University of the Basque Country UPV/EHU, San Sebastian, E-48080, Spain
Landau Institute for Theoretical Physics, RAS, Moscow, 119334, Russian Federation
Kazan Federal University, Republic of Tatarstan, Kazan, 420008, Russian Federation
Physics Department, Lawrence Berkeley National Laboratory, University of California, Berkeley, 94720, CA, United States

The Institute of Mathematical Sciences
INAF/OAS Bologna
INFN
AstroParticule et Cosmologie (APC)
Korea Astronomy and Space Science Institute
University of Science and Technology
Institute for Advanced Study and Physics Department
Energetic Cosmos Laboratory
Donostia International Physics Center
Landau Institute for Theoretical Physics
Kazan Federal University
Physics Department

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