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A. Salvio, “Quasi-Conformal Models and the Early Universe,” Eur. Phys. J. C
Original
1907
Earlier work this paper cites.
R. Utiyama and B. S. DeWitt, “Renormalization of a classical gravitational field interacting with quantized matter fields,” J. Math. Phys
1962
Earlier work this paper cites.
K. S. Stelle, “Renormalization of Higher Derivative Quantum Gravity,” Phys. Rev. D
1977
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A. A. Starobinsky, “A New Type of Isotropic Cosmological Models Without Singularity,” Phys. Lett. B
1980
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K. Freese, J. A. Frieman and A. V. Olinto, “Natural inflation with pseudo - Nambu-Goldstone bosons,” Phys. Rev. Lett
1993
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M. Sasaki and E. D. Stewart, “A General analytic formula for the spectral index of the density perturbations produced during inflation,” Prog. Theor. Phys
1996
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S. Weinberg “The quantum theory of fields. Vol. 2: Modern applications”. Cambridge University Press 1996
1996
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C. Gordon, D. Wands, B. A. Bassett and R. Maartens, “Adiabatic and entropy perturbations from inflation,” Phys. Rev. D
2000
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R. Z. Ferreira, A. Notari and G. Simeon, “Natural Inflation with a periodic non-minimal coupling,” JCAP
Original
2002
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F. L. Bezrukov and M. Shaposhnikov, “The Standard Model Higgs boson as the inflaton,” Phys. Lett. B
Original
2008
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T. Chiba and M. Yamaguchi, “Extended Slow-Roll Conditions and Primordial Fluctuations: Multiple Scalar Fields and Generalized Gravity,” JCAP
Original
2009
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2021

Natural-Scalaron Inflation

Salvio, Alberto

Understand

A pseudo Nambu-Goldstone boson (such as an axion-like particle) is a theoretically well-motivated inflaton as it features a naturally flat potential (natural inflation).

This is because Goldstone's theorem protects its potential from sizable quantum corrections.
Such corrections, however, generically generates an $R^2$ term in the action, which leads to another inflaton candidate because of the equivalence between the $R^2$ term and a scalar field, the scalaron, with a quasi flat potential (Starobinsky inflation).
Here it is investigated a new multifield scenario in which both the scalaron and a pseudo Nambu-Goldstone boson are active (natural-scalaron inflation).

Built on

A. Salvio, “Quasi-Conformal Models and the Early Universe,” Eur. Phys. J. C
Original
1907
Earlier work this paper cites.
R. Utiyama and B. S. DeWitt, “Renormalization of a classical gravitational field interacting with quantized matter fields,” J. Math. Phys
1962
Earlier work this paper cites.
K. S. Stelle, “Renormalization of Higher Derivative Quantum Gravity,” Phys. Rev. D
1977
Earlier work this paper cites.
A. A. Starobinsky, “A New Type of Isotropic Cosmological Models Without Singularity,” Phys. Lett. B
1980
Earlier work this paper cites.
K. Freese, J. A. Frieman and A. V. Olinto, “Natural inflation with pseudo - Nambu-Goldstone bosons,” Phys. Rev. Lett
1993
Earlier work this paper cites.
M. Sasaki and E. D. Stewart, “A General analytic formula for the spectral index of the density perturbations produced during inflation,” Prog. Theor. Phys
1996
Earlier work this paper cites.
S. Weinberg “The quantum theory of fields. Vol. 2: Modern applications”. Cambridge University Press 1996
1996
Earlier work this paper cites.
C. Gordon, D. Wands, B. A. Bassett and R. Maartens, “Adiabatic and entropy perturbations from inflation,” Phys. Rev. D
2000
Earlier work this paper cites.
R. Z. Ferreira, A. Notari and G. Simeon, “Natural Inflation with a periodic non-minimal coupling,” JCAP
Original
2002
Earlier work this paper cites.
F. L. Bezrukov and M. Shaposhnikov, “The Standard Model Higgs boson as the inflaton,” Phys. Lett. B
Original
2008
Earlier work this paper cites.
T. Chiba and M. Yamaguchi, “Extended Slow-Roll Conditions and Primordial Fluctuations: Multiple Scalar Fields and Generalized Gravity,” JCAP
Original
2009
Earlier work this paper cites.