Palatini Higgs inflation and the refined dS conjecture

Liu, Yang

doi:10.1140/epjp/s13360-021-01873-3

Cited by 3 publications

(1 citation statement)

References 16 publications

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“…The idea of considering scalar fields geometrical in origin have also been employed in other models. For example in some approaches in which the Palatini's principle is employed [29,30], and in the so named conformal equivalence principle [31]. Geometrical scalar fields have been even used in some theories of gravity with extra dimensions.…”

Section: Introductionmentioning

confidence: 99%

Dark energy from a geometrical gauge scalar-tensor theory of gravity

Aguilar

Montes²,

Bernal³

2023

Phys. Scr.

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In this paper we obtain some cosmological solutions that describe the present period of accelerating expansion of the universe in the framework of a geometrical gauge scalar-tensor theory of gravity. The background geometry in the model is the Weyl integrable and we found a class of power law solutions for the Weyl scalar field when an invariant metric is employed in a power law expanding universe. We obtain a deceleration and an equation of state parameters (EoS) in agreement with PLANCK 2018 observational data for some specific parameters of the model. The deceleration parameter tends asymptotically to $-1/2$ and the phantom divide line can be crossed by the EoS parameter in this model.

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Section: Introductionmentioning

confidence: 99%

Dark energy from a geometrical gauge scalar-tensor theory of gravity

Aguilar

Montes²,

Bernal³

2023

Phys. Scr.

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Further Refining Swampland Conjecture on Inflation in General Scalar‐Tensor Theories of Gravity

Yuennan

Channuie

2022

Fortschritte der Physik

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An alternative refined de Sitter conjecture giving rise to a natural combination of the first and second derivatives of the scalar potential was proposed recently by David Andriot and Christoph Roupec (Fortsch. Phys. 67 (2019) no.1‐2, 1800105). In this work, we study the inflation models in a general scalar‐tensor theory with exponential and hyperbolic tangent forms of potential as well as model with quantum corrected potential and examine whether these three models of inflation can satisfy this further refining de Sitter swampland conjecture or not. Regarding our analysis with proper choices of parameters a,b=1−a$a, b=1- a$ and q, we find that these three inflationary models can always satisfy this new refined swampland conjecture. Therefore, all three inflationary models might all be in “landscape” since the “further refining de Sitter swampland conjecture” is satisfied.

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Higgs inflation and its extensions and the further refining dS swampland conjecture

Liu

2021

Eur. Phys. J. C

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On the one hand, Andriot and Roupec (Fortsch Phys, 1800105, 2019) proposed an alternative refined de Sitter conjecture, which gives a natural condition on a combination of the first and second derivatives of the scalar potential (Andriot and Roupec 2019). On the other hand, in our previous article (Liu in Eur Phys J Plus 136:901, 2021) , we have found that Palatini Higgs inflation model is in strong tension with the refined de Sitter swampland conjecture (Liu 2021). Therefore, following our previous research, in this article we examine if Higgs inflation model and its two variations: Palatini Higgs inflation and Higgs-Dilaton model (Rubio in Front Astron Space Sci, 10.3389/fspas.2018.00050, 2019) can satisfy the “further refining de Sitter swampland conjecture” or not. Based on observational data (Ade et al., Phys Rev Lett 121:221301, 2018; Akrami et al., Planck 2018 results. X. Constraints on inflation, arXiv:1807.06211 [astro-ph.CO], 2018; Aghanim et al., Planck 2018 results: VI. Cosmological parameters, arXiv:1807.06209 [astro-ph.CO], 2018), we find that these three inflationary models can always satisfy this new swampland conjecture if only we adjust the relevant parameters a, $$b = 1-a$$ b = 1 - a and q. Therefore, if the “further refining de Sitter swampland conjecture” does indeed hold, then the three inflationary models might all be in “landscape”.

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Palatini Higgs inflation and the refined dS conjecture

Cited by 3 publications

References 16 publications

Dark energy from a geometrical gauge scalar-tensor theory of gravity

Dark energy from a geometrical gauge scalar-tensor theory of gravity

Further Refining Swampland Conjecture on Inflation in General Scalar‐Tensor Theories of Gravity

Higgs inflation and its extensions and the further refining dS swampland conjecture

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