Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | 060 |
| Fachzeitschrift | Journal of Cosmology and Astroparticle Physics |
| Jahrgang | 2023 |
| Ausgabenummer | 4 |
| Publikationsstatus | Veröffentlicht - 24 Apr. 2023 |
| Extern publiziert | Ja |
Abstract
We construct an asymmetric bouncing scenario within the VCDM model — also known as type-II minimally modified gravity, — a modified gravity theory with two local physical degrees of freedom. The scenario is exempt of any ghost or gradient instability, ad-hoc matching conditions or anisotropic stress issue (BKL instability). It moreover succeeds in generating the cosmological perturbations compatible with the observations. The scalar spectral index can be adapted by the choice of the equation of state of the matter sector and the form of the VCDM potential leading to an almost scale-invariant power spectrum. Satisfying the CMB bounds on the tensor-to-scalar ratio leads to a blue tensor spectrum.
ASJC Scopus Sachgebiete
- Physik und Astronomie (insg.)
- Astronomie und Astrophysik
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in: Journal of Cosmology and Astroparticle Physics, Jahrgang 2023, Nr. 4, 060, 24.04.2023.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Bouncing cosmology in VCDM
AU - Ganz, Alexander
AU - Martens, Paul
AU - Mukohyama, Shinji
AU - Namba, Ryo
N1 - Acknowledgments A.G. receives support by the grant No. UMO-2021/40/C/ST9/00015 from the National Science Centre, Poland. P.M. acknowledges support from the Japanese Government (MEXT) scholarship for Research Student. The work of S.M. was supported in part by Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research No. 17H02890, No. 17H06359, and by World Premier International Research Center Initiative, MEXT, Japan. R.N. was in part supported by the RIKEN Incentive Research Project grant. A.G. wishes to thank YITP for hospitality during the development of this project
PY - 2023/4/24
Y1 - 2023/4/24
N2 - We construct an asymmetric bouncing scenario within the VCDM model — also known as type-II minimally modified gravity, — a modified gravity theory with two local physical degrees of freedom. The scenario is exempt of any ghost or gradient instability, ad-hoc matching conditions or anisotropic stress issue (BKL instability). It moreover succeeds in generating the cosmological perturbations compatible with the observations. The scalar spectral index can be adapted by the choice of the equation of state of the matter sector and the form of the VCDM potential leading to an almost scale-invariant power spectrum. Satisfying the CMB bounds on the tensor-to-scalar ratio leads to a blue tensor spectrum.
AB - We construct an asymmetric bouncing scenario within the VCDM model — also known as type-II minimally modified gravity, — a modified gravity theory with two local physical degrees of freedom. The scenario is exempt of any ghost or gradient instability, ad-hoc matching conditions or anisotropic stress issue (BKL instability). It moreover succeeds in generating the cosmological perturbations compatible with the observations. The scalar spectral index can be adapted by the choice of the equation of state of the matter sector and the form of the VCDM potential leading to an almost scale-invariant power spectrum. Satisfying the CMB bounds on the tensor-to-scalar ratio leads to a blue tensor spectrum.
KW - alternatives to inflation
KW - cosmological perturbation theory
KW - Cosmological perturbation theory in GR and beyond
KW - modified gravity
UR - http://www.scopus.com/inward/record.url?scp=85153872053&partnerID=8YFLogxK
U2 - 10.48550/arXiv.2212.13561
DO - 10.48550/arXiv.2212.13561
M3 - Article
AN - SCOPUS:85153872053
VL - 2023
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
SN - 1475-7516
IS - 4
M1 - 060
ER -