Zobrazeno 1 - 10
of 30
pro vyhledávání: '"Cunillera, Francesc"'
We present a type IIB 4D string model with stabilised moduli which is able to describe the history of the universe from inflation to quintessence. The underlying Calabi-Yau volume is controlled by two moduli which are stabilised by perturbative effec
Externí odkaz:
http://arxiv.org/abs/2407.03405
Autor:
Cunillera, Francesc
The subject of this thesis is cosmological implications of string compactifications understood in a broad sense. In the first half of the thesis, we will begin by reviewing the four-dimensional description of the tree-level perturbative type IIB acti
Externí odkaz:
http://arxiv.org/abs/2208.00177
We carry out a thorough numerical examination of field theory monodromy inflation at strong coupling. We perform an MCMC analysis using a Gaussian likelihood, fitting multiparameter models using CMB constraints on the spectral index and the tensor to
Externí odkaz:
http://arxiv.org/abs/2205.14952
We provide a detailed discussion of the main theoretical and phenomenological challenges of quintessence model building in any numerically controlled regime of the moduli space of string theory. We argue that a working quintessence model requires a l
Externí odkaz:
http://arxiv.org/abs/2112.10783
We provide evidence that slow roll is not possible in any parametrically controlled regime of the moduli space of string theory. This is proven in full generality in the asymptotic limit of the moduli space of type II and heterotic Calabi-Yau compact
Externí odkaz:
http://arxiv.org/abs/2112.10779
We investigate the combined effect of fluxes and higher-order curvature corrections, in the form of the Gauss-Bonnet term, on the existence of de Sitter vacua in a heterotic string inspired framework, compactified on spheres and tori. We first gain s
Externí odkaz:
http://arxiv.org/abs/2112.05771
Autor:
Cunillera, Francesc, Padilla, Antonio
We argue that, for generic string compactifications, dark energy is likely to signal the beginning of the end of our universe, perhaps even through decompactification, with possible implications for the cosmological coincidence problem. Thanks to the
Externí odkaz:
http://arxiv.org/abs/2105.03426
Publikováno v:
Phys. Rev. D 101, 085012 (2020)
We propose a mechanism that generates a naturally light dark energy field (with Hubble scale mass), starting from a theory with exclusively high scale (Planckian) couplings. It is derived from the clockwork model, with ${\cal O}(100)$ scalar fields i
Externí odkaz:
http://arxiv.org/abs/1912.04905
In this paper we consider the Dvali and G\'omez assumption that the end state of a gravitational collapse is a Bose-Einstein condensate of gravitons. We then construct the two Gross-Pitaevskii equations for a static and spherically symmetric configur
Externí odkaz:
http://arxiv.org/abs/1711.01282