Primordial gravitational waves from axion-gauge fields dynamics
By E. Dimastrogiovanni, Matteo Fasiello, Tomohiro Fujita. 2016
193 citations recorded by the source corpus.
Inspired by the chromo-natural inflation model of Adshead&Wyman, we reshape its scalar content to relax the tension with current observational bounds. Besides an inflaton, the setup includes a spectator sector in which an axion and SU(2) gauge fields are coupled via a Chern-Simons-type term. The result is a viable theory endowed with an alternative production mechanism for gravitational waves during inflation. The gravitational wave signal sourced by the spectator fields can be much larger than the contribution from standard vacuum fluctuations, it is distinguishable from the latter on the basis of its chirality and, depending on the theory parameters values, also its tilt. This production process breaks the well-known relation between the tensor-to-scalar ratio and the energy scale of inflation. As a result, even if the Hubble rate is itself too small for the vacuum to generate a tensor amplitude detectable by upcoming experiments, this model still supports observable gravitational waves.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/c2717cbd20a36eb5d1efca1960e3b0aa87ae72ff
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Astronomy and Astrophysics
- Marco Peloso
- C. Caprini
- Daniel G. Figueroa
- M. Pieroni
- E. Komatsu
- G. Nardini
- A. Ricciardone
- G. Tasinato
In Nuclear and High Energy Physics
- Marco Peloso
- C. Caprini
- Daniel G. Figueroa
- E. Komatsu
- M. Pieroni
- G. Tasinato
- G. Nardini
- Raphael Flauger
Citations in the corpus
- Reconstructing the spectral shape of a stochastic gravitational wave background with LISA (2019, background): “[6–29]), to models that break space-time symmetries during inflation, leading to a blue spectrum for primordial tensor modes (see e.”
- New physics from the polarized light of the cosmic microwave background (2022, methodology): “The model can be made compatible with observational data by modifying χ ’s potential 261,262 or kinetic term 263 ; making χ a spectator field 264,265 ; giving mass to the gauge field via a Higgs-like mechanism 266–268 ; delaying the onset of the Chromo-natural inflation phase so that GW is not…”