Primordial gravitational waves in DHOST inflation
ABSTRACT We consider DHOST inflationary models with a shift symmetry leading to a de Sitter space–time at the background cosmological level. Deviations from scale invariance of the scalar and tensor perturbations follow from the breaking of the shift symmetry by quadratic and quartic operators. These models show a strong violation of the consistency relation of single-field inflationary models with a very flat spectrum of tensor perturbations. This opens up the prospects of future detection of primordial gravitational waves by mHz experiments.
Authors
- Andrei Lazanu (ORCID: https://orcid.org/0000-0002-8061-9828)
- Philippe Brax (ORCID: https://orcid.org/0000-0003-0727-3186)
Institutions
- Centre National de la Recherche Scientifique (FR)
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR)
- Université Paris-Saclay (FR)
- University of Manchester (GB)
- CEA Paris-Saclay (FR)
- Institut de Physique Théorique (FR)
Publication Details
- Journal
- Monthly Notices of the Royal Astronomical Society Letters
- Published
- 2025-03-26
- DOI
- https://doi.org/10.1093/mnrasl/slaf040
- Citations
- 1
- Primary Topic
- Cosmology and Gravitation Theories
- Type
- article
- Field-Weighted Citation Impact
- 1.15
Funders
- UK Research and Innovation