Browsing by Author "70d8738a-9654-4b52-b645-7fdac45ca8e5"

Now showing items 1-8 of 8

    • A tip for landscape riders: multi-field inflation can fulfill the swampland distance conjecture 
      Bravo, Rafael; Palma, Gonzalo A.; Riquelme, Simón (IOP, 2020)
      We study how both the swampland distance conjecture and the Lyth bound affect the parameter space of multi-field models of inflation. A generic feature of multi-field inflation is that the geodesic distance [Delta phi](G) ...
    • Constraints on Holographic Multifield Inflation and Models Based on the Hamilton-Jacobi Formalism 
      Achúcarro, Ana; Céspedes, Sebastián; Davis, Anne Christine; Palma, Gonzalo A. (American Physical Society, 2019)
      In holographic inflation, the 4D cosmological dynamics is postulated to be dual to the renormalization group flow of a 3D Euclidean conformal field theory with marginally relevant operators. The scalar potential of the 4D ...
    • Constraints on inflation with LSS surveys: Features in the primordial power spectrum 
      Palma, Gonzalo; Sapone, Domenico; Sypsas, Spyros (Institute of Physics Publishing, 2018)
      We analyse the efficiency of future large scale structure surveys to unveil the presence of scale dependent features in the primordial spectrum –resulting from cosmic inflation– imprinted in the distribution of galaxies. ...
    • Landscape tomography through primordial non-Gaussianity 
      Chen, Xingang; Palma, Gonzalo; Riquelme, Walter; Scheihing H., Bruno; Sypsas, Spyros (American Physical Society, 2018)
      In this paper, we show how the structure of the landscape potential of the primordial Universe may be probed through the properties of the primordial density perturbations responsible for the origin of the cosmic microwave ...
    • Non-Gaussian CMB and LSS statistics beyond polyspectra 
      Palma, Gonzalo A.; Scheihing Hitschfeld, Bruno; Sypsas, Spyros (IOP Publishing, 2020)
      Cosmic inflation may have led to non-Gaussian initial conditions that cannot be fully parametrised by 3- and/or 4-point functions. In this work, we discuss various strategies to search for primordial non-Gaussianity beyond ...
    • Origin of ultra-light fields during ination and their suppressed non-Gaussianity 
      Achúcarro, Ana; Palma, Gonzalo A.; Wang, Dong-Gang; Welling, Yvette (IOP Publishing, 2020)
      We study the structure of multi-field inflation models where the primordial curvature perturbation is able to vigorously interact with an ultra-light isocurvature field - a massless fluctuation orthogonal to the background ...
    • Reconstructing the Inflationary Landscape with Cosmological Data 
      Chen, Xingang; Palma, Gonzalo; Scheihing, Bruno; Sypsas, Spyros (American Physical Society, 2018)
      We show that the shape of the inflationary landscape potential may be constrained by analyzing cosmological data. The quantum fluctuations of fields orthogonal to the inflationary trajectory may have probed the structure ...
    • The string swampland constraints require multi-field inflation 
      Achúcarro, Ana; Palma, Gonzalo A. (Institute of Physics Publishing, 2019)
      An important unsolved problem that affects practically all attempts to connect string theory to cosmology and phenomenology is how to distinguish effective field theories belonging to the string landscape from those that ...