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Author  |
Moretti, F.; Bombacigno, F. |
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Title |
Dynamical system analysis of the cosmological phases in Palatini k-essence gravity |
Type |
Journal Article |
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Year |
2026 |
Publication |
Journal of Cosmology and Astroparticle Physics |
Abbreviated Journal |
J. Cosmol. Astropart. Phys. |
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Volume |
09 |
Issue |
9 |
Pages |
040 - 45pp |
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Keywords |
modified gravity; Gauss-Bonnet-Lovelock-Horndeski-Palatini etc gravity theories; inflation |
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Abstract |
We formulate a generalized k-essence model in the presence of a Palatini f (R) gravitational sector. In the corresponding biscalar-tensor theory, we discuss the distinguished be still algebraically solved in terms of matter, the k-essence field and its kinetic term. We derive the conditions ensuring the absence of Ostrogradsky modes and the well-posedness of the initial data problem, also providing an intriguing analogy with a specific class of DHOST theories. Then, we investigate the cosmology of a flat Friedmann-Lema & icirc;tre-Robertson-Walker spacetime according to a dynamical system approach, with the aim of determining the set of fixed points in the phase space, representing specific periods of the Universe evolution and characterized by different effective barotropic index weft. The analysis reveals the presence of a range of possible configurations, with the existence of (quasi) de-Sitter epochs connected by hetero clinic orbits, scaling solutions and quintessence phases. |
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Address |
[Moretti, F.] ENEA, CR Frascati, Fus & Nucl Safety Dept, Via E Fermi 45, I-00044 Frascati, Italy, Email: fabio.moretti.1@enea.it; |
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Publisher |
IOP Publishing Ltd |
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Language |
English |
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Original Title |
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Series Volume |
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Edition |
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ISSN |
1475-7516 |
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Notes |
WOS:001870230900008 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7441 |
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