https://doi.org/10.1140/epjc/s10052-021-09516-8
Regular Article - Theoretical Physics
Inflation with non-canonical scalar fields revisited
1
Department of Physics, University of Patras, 26500, Patras, Greece
2
National Observatory of Athens, Lofos Nymfon, 11852, Athens, Greece
3
Department of Physics, National Technical University of Athens, Zografou Campus, 15773, Athens, Greece
4
Department of Astronomy, School of Physical Sciences, University of Science and Technology of China, 230026, Hefei, People’s Republic of China
Received:
31
March
2021
Accepted:
30
July
2021
Published online:
10
August
2021
We revisit inflation with non-canonical scalar fields by applying deformed-steepness exponential potentials. We show that the resulting scenario can lead to inflationary observables, and in particular to scalar spectral index and tensor-to-scalar ratio, in remarkable agreement with observations. Additionally, a significant advantage of the scenario is that the required parameter values, such as the non-canonicality exponent and scale, as well as the potential exponent and scale, do not need to acquire unnatural values and hence can accept a theoretical justification. Hence, we obtain a significant improvement with respect to alternative schemes, and we present distinct correlations between the model parameters that better fit the data, which can be tested in future probes. This combination of observational efficiency and theoretical justification makes the scenario at hand a good candidate for the description of inflation.
© The Author(s) 2021
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