TY  - JOUR
AU  - Figueroa, D. G.
AU  - Lizarraga, J.
AU  - Urio, A.
AU  - Urrestilla, J.
PY  - 2023
DA  - 2023//
TI  - Strong Backreaction Regime in Axion Inflation
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 151003
EP  - 7pp
VL  - 131
IS  - 15
PB  - Amer Physical Soc
AB  - We study the nonlinear dynamics of axion inflation, capturing for the first time the inhomogeneity and full dynamical range during strong backreaction, till the end of inflation. Accounting for inhomogeneous effects leads to a number of new relevant results, compared to spatially homogeneous studies: (i) the number of extra efoldings beyond slow-roll inflation increases very rapidly with the coupling, (ii) oscillations of the inflaton velocity are attenuated, (iii) the tachyonic gauge field helicity spectrum is smoothed out (i.e., the spectral oscillatory features disappear), broadened, and shifted to smaller scales, and (iv) the nontachyonic helicity is excited, reducing the chiral asymmetry, now scale dependent. Our results are expected to impact strongly on the phenomenology and observability of axion inflation, including gravitational wave generation and primordial black hole production.
SN  - 0031-9007
UR  - https://arxiv.org/abs/2303.17436
UR  - https://doi.org/10.1103/PhysRevLett.131.151003
DO  - 10.1103/PhysRevLett.131.151003
LA  - English
N1  - WOS:001093422100002
ID  - Figueroa_etal2023
ER  -