Built on

K. Choi and J. E. Kim, “Harmful Axions in Superstring Models,” Phys. Lett. B 154
1985
Earlier work this paper cites.
N. Kaloper and L. Sorbo, “A Natural Framework for Chaotic Inflation,” Phys. Rev. Lett. 102
Original
1989
Earlier work this paper cites.
A. Berera, “Warm inflation,” Phys. Rev. Lett. 75
1995
Earlier work this paper cites.
A. Lue, L. -M. Wang and M. Kamionkowski, “Cosmological signature of new parity violating interactions,” Phys. Rev. Lett. 83
1999
Earlier work this paper cites.
D. J. H. Chung, E. W. Kolb, A. Riotto and I. I. Tkachev, “Probing Planckian physics: Resonant production of particles during inflation and features in the primordial power spectrum,” Phys. Rev. D 62
2000
Earlier work this paper cites.
T. Banks, M. Dine, P. J. Fox and E. Gorbatov, “On the possibility of large axion decay constants,” JCAP 0306
2003
Earlier work this paper cites.
P. Svrcek and E. Witten, “Axions In String Theory,” JHEP 0606
2006
Earlier work this paper cites.
S. Saito, K. Ichiki and A. Taruya, “Probing polarization states of primordial gravitational waves with CMB anisotropies,” JCAP 0709
Original
2007
Earlier work this paper cites.
E. Silverstein and A. Westphal, “Monodromy in the CMB: Gravity Waves and String Inflation,” Phys. Rev. D 78
Original
2008
Earlier work this paper cites.
J. -O. Gong, “Lessons from the running of the tensor-to-scalar ratio,” Phys. Rev. D 79
Original
2009
Earlier work this paper cites.

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Then

D. Carney, W. Fischler, E. D. Kovetz, D. Lorshbough and S. Paban, “Rapid field excursions and the inflationary tensor spectrum,” JHEP 1211
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2012
Later among the works it cites.
N. Barnaby, J. Moxon, R. Namba, M. Peloso, G. Shiu and P. Zhou, “Gravity waves and non-Gaussian features from particle production in a sector gravitationally coupled to the inflaton,” Phys. Rev. D 86
Original
2012
Later among the works it cites.
J. L. Cook and L. Sorbo, “An inflationary model with small scalar and large tensor nongaussianities,” JCAP 1311
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M. Shiraishi, A. Ricciardone and S. Saga, “Parity violation in the CMB bispectrum by a rolling pseudoscalar,” JCAP 1311
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Later among the works it cites.
P. A. R. Ade et al

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2014

Blue Tensor Spectrum from Particle Production during Inflation

Mukohyama, Shinji, Namba, Ryo, Peloso, Marco et al.

Understand

We discuss a mechanism of particle production during inflation that can result in a blue gravitational wave (GW) spectrum, compatible with the BICEP2 result and with the r < 0.11 limit on the tensor-to-scalar ratio at the Planck pivot scale.

The mechanism is based on the production of vector quanta from a rolling pseudo-scalar field.
Both the vector and the pseudo-scalar are only gravitationally coupled to the inflaton, to keep the production of inflaton quanta at an unobservable level (the overproduction of non-gaussian scalar perturbations is a generic difficulty for mechanisms that aim to generate a visible GW signal from particle production during inflation).
This mechanism can produce a detectable amount of GWs for any inflationary energy scale.

Built on

K. Choi and J. E. Kim, “Harmful Axions in Superstring Models,” Phys. Lett. B 154
1985
Earlier work this paper cites.
N. Kaloper and L. Sorbo, “A Natural Framework for Chaotic Inflation,” Phys. Rev. Lett. 102
Original
1989
Earlier work this paper cites.
A. Berera, “Warm inflation,” Phys. Rev. Lett. 75
1995
Earlier work this paper cites.
A. Lue, L. -M. Wang and M. Kamionkowski, “Cosmological signature of new parity violating interactions,” Phys. Rev. Lett. 83
1999
Earlier work this paper cites.
D. J. H. Chung, E. W. Kolb, A. Riotto and I. I. Tkachev, “Probing Planckian physics: Resonant production of particles during inflation and features in the primordial power spectrum,” Phys. Rev. D 62
2000
Earlier work this paper cites.
T. Banks, M. Dine, P. J. Fox and E. Gorbatov, “On the possibility of large axion decay constants,” JCAP 0306
2003
Earlier work this paper cites.
P. Svrcek and E. Witten, “Axions In String Theory,” JHEP 0606
2006
Earlier work this paper cites.
S. Saito, K. Ichiki and A. Taruya, “Probing polarization states of primordial gravitational waves with CMB anisotropies,” JCAP 0709
Original
2007
Earlier work this paper cites.
E. Silverstein and A. Westphal, “Monodromy in the CMB: Gravity Waves and String Inflation,” Phys. Rev. D 78
Original
2008
Earlier work this paper cites.
J. -O. Gong, “Lessons from the running of the tensor-to-scalar ratio,” Phys. Rev. D 79
Original
2009
Earlier work this paper cites.