KFU. Card publication. Ghost-free F(R,G) gravity

KAZAN
FEDERAL UNIVERSITY

- RUS
- 中文
- ES

GHOST-FREE F(R,G) GRAVITY

Form of presentation

Articles in international journals and collections

Year of publication

2021

Язык

английский

Authors, employees of KFU

Odincov Sergey Dmitrievich, author

Popov Arkadiy Aleksandrovich, author

Other authors

Oikonomou Vasilis , author

Bibliographic description in the original language

Nojiri S., Odintsov S.D., Oikonomou V.K., Popov A.A. Ghost-free F(R,G) gravity / S. Nojiri, S.D. Odintsov, V.K. Oikonomou, A.A. Popov // Nuclear Physics B. - 2021. - V. 973. - P. 115617

Annotation

In this work we shall address the ghost issue of gravity, which is known to be plagued with ghost degrees of freedom. These ghosts occur due to the presence of higher than two derivatives in the field equations, and can arise even when considering cosmological perturbations, where superluminal modes may arise in the theory. If we consider the quantum theory, the ghosts generate the negative norm states, which give the negative probabilities, and therefore the ghosts are physically inconsistent. Motivated by the importance of gravity for providing viable inflationary and dark energy phenomenologies, in this work we shall provide a technique that can render gravity theories free from ghost degrees of freedom. This will be done by introducing two auxiliary scalar fields, and by employing the Lagrange multiplier technique, the theory is ghost free in the Einstein frame. Also the framework can be viewed as a reconstruction technique and can be used as a method in order to realize several cosmological evolutions of interest. We demonstrate how we can realize several cosmologically interesting phenomenologies by using the reconstruction technique.

Keywords

f(R,G) gravity, cosmology, modified gravity

The name of the journal

Nuclear Physics B

URL

https://www.sciencedirect.com/science/article/pii/S055032132100314X?via%3Dihub

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=259466&p_lang=2

Resource files

File name	Size (MB)	Format
F_1_s2.0_S055032132100314X_main.pdf	0,31	pdf	show / download

Full metadata record

Field DC	Value	Language
dc.contributor.author	Odincov Sergey Dmitrievich	ru_RU
dc.contributor.author	Popov Arkadiy Aleksandrovich	ru_RU
dc.contributor.author	Oikonomou Vasilis	ru_RU
dc.date.accessioned	2021-01-01T00:00:00Z	ru_RU
dc.date.available	2021-01-01T00:00:00Z	ru_RU
dc.date.issued	2021	ru_RU
dc.identifier.citation	Nojiri S., Odintsov S.D., Oikonomou V.K., Popov A.A. Ghost-free F(R,G) gravity / S. Nojiri, S.D. Odintsov, V.K. Oikonomou, A.A. Popov // Nuclear Physics B. - 2021. - V. 973. - P. 115617	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=259466&p_lang=2	ru_RU
dc.description.abstract	Nuclear Physics B	ru_RU
dc.description.abstract	In this work we shall address the ghost issue of gravity, which is known to be plagued with ghost degrees of freedom. These ghosts occur due to the presence of higher than two derivatives in the field equations, and can arise even when considering cosmological perturbations, where superluminal modes may arise in the theory. If we consider the quantum theory, the ghosts generate the negative norm states, which give the negative probabilities, and therefore the ghosts are physically inconsistent. Motivated by the importance of gravity for providing viable inflationary and dark energy phenomenologies, in this work we shall provide a technique that can render gravity theories free from ghost degrees of freedom. This will be done by introducing two auxiliary scalar fields, and by employing the Lagrange multiplier technique, the theory is ghost free in the Einstein frame. Also the framework can be viewed as a reconstruction technique and can be used as a method in order to realize several cosmological evolutions of interest. We demonstrate how we can realize several cosmologically interesting phenomenologies by using the reconstruction technique.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	f(R	ru_RU
dc.subject	G) gravity	ru_RU
dc.subject	cosmology	ru_RU
dc.subject	modified gravity	ru_RU
dc.title	Ghost-free F(R,G) gravity	ru_RU
dc.type	Articles in international journals and collections	ru_RU