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Late time acceleration in Palatini gravity / Antoniadis, Ignatios (Paris, LPTHE ; SISSA, Trieste ; ICTP, Trieste) ; Guillen, Anthony (Paris, LPTHE) ; Tamvakis, Kyriakos (Ioannina U. ; CERN)
We investigate the effect of the quadratic correction $\alpha R^2$ and non-minimal coupling $\xi \phi^2 R$ on a quintessence model with an exponential potential $V(\phi) = M^4\exp(-\lambda\phi)$ in the Palatini formulation of gravity. We use dynamical system techniques to analyze the attractor structure of the model and uncover the possible trajectories of the system. [...]
arXiv:2207.13732.- 2022-11-24 - 25 p. - Published in : JHEP 11 (2022) 144 Fulltext: document - PDF; 2207.13732 - PDF;

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Ultraviolet behaviour of Higgs inflation models / Antoniadis, Ignatios (Paris, LPTHE ; Nordita ; Royal Inst. Tech., Stockholm) ; Guillen, Anthony (Paris, LPTHE) ; Tamvakis, Kyriakos (Ioannina U. ; CERN)
We study the ultraviolet behaviour of Higgs inflation models above the apparent unitarity violation scale arising from the large non minimal coupling to gravity, by computing on-shell 4-point scattering amplitudes in the presence of a large inflaton background, away from the electroweak vacuum. We find that all tree-level amplitudes are well behaved at high energies below the inflaton background that can thus take values up to the Planck scale. [...]
arXiv:2106.09390; arXiv:2203.10040.- 2021-08-04 - 21 p. Addendum: PDF; Fulltext: document - PDF; 2203.10040 - PDF; Preprint: PDF;

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