Quantum corrections to inflation : The importance of RG running and choosing the optimal RG scale
Herranen, M., Hohenegger, A., Osland, A., & Tranberg, A. (2017). Quantum corrections to inflation : The importance of RG running and choosing the optimal RG scale. Physical Review D, 95(2), Article 023525. https://doi.org/10.1103/PhysRevD.95.023525
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Physical Review DDate
2017Copyright
© 2017 American Physical Society. Published in this repository with the kind permission of the publisher.
We demonstrate the importance of correctly implementing RG running and choosing the RG scale when
calculating quantum corrections to inflaton dynamics. We show that such corrections are negligible for
single-field inflation, in the sense of not altering the viable region in the ns − r plane, when imposing
Planck constraints on As. Surprisingly, this also applies, in a nontrivial way, for an inflaton coupled to
additional spectator degrees of freedom. The result relies on choosing the renormalization scale (pseudo-)
optimally, thereby avoiding unphysical large logarithmic corrections to the Friedmann equations and large
running of the couplings. We find that the viable range of parameters of the potential is altered relative to
the classical limit, and we find an upper limit of g ≃ 10−4 on the value of the inflaton-spectator portal
coupling still allowing for inflation and an upper limit of g ≃ 10−5 for inflation to correctly reproduce the
scalar amplitude of fluctuations As.
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American Physical SocietyISSN Search the Publication Forum
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