Constant roll inflation in multifield models

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Amer Physical Soc
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Constant roll inflation is analyzed in the presence of multiscalar fields which are assumed to be described by a constant roll rate each. The different cases are studied and the corresponding potentials are reconstructed. The exact solutions are obtained, which show a similar behavior to the single scalar field model. For one of the cases analyzed in the paper, the so-called adiabatic field also constantly roll(s) while entropy perturbations become null, while the second case may lead to nonadiabatic perturbations. Both cases can fit the Planck data well by assuming the appropriate values for the free parameters of the models.
© 2020 American Physical Society. M. G. is funded by the predoctoral Contract No. 2018-T1/TIC-10431. D. R. G. is funded by the Atraccion de Talento Investigador programme of the Comunidad de Madrid (Spain) No. 2018-T1/TIC-10431, and acknowledges further support from the Ministerio de Ciencia, Innovacion y Universidades (Spain) Project No. PID2019-108485 GB-I00/AEI/10.13039/501100011033, the Fundacao para a Ciencia e a Tecnologia (FCT, Portugal) research projects No. PTDC/FIS-OUT/29048/2017 and No. PTDC/FIS-PAR/31938/2017, the Projects No. FIS2017-84440-C2-1-P (MINECO/FEDER, EU) and No. H2020-MSCA-RISE-2017, Grant No. FunFiCO-777740 and the Edital 006/2018 PRONEX (FAPESQ-PB/CNPQ, Brazil) Grant No. 0015/2019. D. S-C. G is funded by the University of Valladolid (Spain) and by the program MOVILIDAD INVESTIGADORES UVa-BANCO SANTANDER 2020, and thanks the Department of Theoretical Physics and IPARCOS at Complutense University of Madrid for their hospitality while doing this work. This article is based upon work from COST Actions CA15117 and CA18108, supported by COST (European Cooperation in Science and Technology).
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