КФУ. Карточка публикации. Ghost-free F(R,G) gravity

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GHOST-FREE F(R,G) GRAVITY

Форма представления

Статьи в зарубежных журналах и сборниках

Год публикации

2021

Язык

английский

Авторы, сотрудники КФУ

Одинцов Сергей Дмитриевич, автор

Попов Аркадий Александрович, автор

Другие авторы

Oikonomou Vasilis , автор

Библиографическое описание на языке оригинала

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

Аннотация

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.

Ключевые слова

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

Название журнала

Nuclear Physics B

URL

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

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https://repository.kpfu.ru/?p_id=259466

Файлы ресурса

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F_1_s2.0_S055032132100314X_main.pdf	0,31	pdf	посмотреть / скачать

Полная запись метаданных

Поле DC	Значение	Язык
dc.contributor.author	Одинцов Сергей Дмитриевич	ru_RU
dc.contributor.author	Попов Аркадий Александрович	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/?p_id=259466	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	Статьи в зарубежных журналах и сборниках	ru_RU