Ghost-free F(R,G) gravity

In this work we shall address the ghost issue of F(R,G) 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 superlumina...

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Autores principales:	S. Nojiri, S.D. Odintsov, V.K. Oikonomou, Arkady A. Popov
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
Acceso en línea:	https://doaj.org/article/d0d965bf3064485798aa3c9910c58d3a
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id	oai:doaj.org-article:d0d965bf3064485798aa3c9910c58d3a
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spelling	oai:doaj.org-article:d0d965bf3064485798aa3c9910c58d3a2021-12-04T04:33:02ZGhost-free F(R,G) gravity0550-321310.1016/j.nuclphysb.2021.115617https://doaj.org/article/d0d965bf3064485798aa3c9910c58d3a2021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S055032132100314Xhttps://doaj.org/toc/0550-3213In this work we shall address the ghost issue of F(R,G) 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 F(R,G) gravity for providing viable inflationary and dark energy phenomenologies, in this work we shall provide a technique that can render F(R,G) 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.S. NojiriS.D. OdintsovV.K. OikonomouArkady A. PopovElsevierarticleNuclear and particle physics. Atomic energy. RadioactivityQC770-798ENNuclear Physics B, Vol 973, Iss , Pp 115617- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
spellingShingle	Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 S. Nojiri S.D. Odintsov V.K. Oikonomou Arkady A. Popov Ghost-free F(R,G) gravity
description	In this work we shall address the ghost issue of F(R,G) 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 F(R,G) gravity for providing viable inflationary and dark energy phenomenologies, in this work we shall provide a technique that can render F(R,G) 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.
format	article
author	S. Nojiri S.D. Odintsov V.K. Oikonomou Arkady A. Popov
author_facet	S. Nojiri S.D. Odintsov V.K. Oikonomou Arkady A. Popov
author_sort	S. Nojiri
title	Ghost-free F(R,G) gravity
title_short	Ghost-free F(R,G) gravity
title_full	Ghost-free F(R,G) gravity
title_fullStr	Ghost-free F(R,G) gravity
title_full_unstemmed	Ghost-free F(R,G) gravity
title_sort	ghost-free f(r,g) gravity
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/d0d965bf3064485798aa3c9910c58d3a
work_keys_str_mv	AT snojiri ghostfreefrggravity AT sdodintsov ghostfreefrggravity AT vkoikonomou ghostfreefrggravity AT arkadyapopov ghostfreefrggravity
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Ghost-free F(R,G) gravity

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