Browsing by Author "abe5639a-0053-4845-a06b-9ad371ea6767"

Now showing items 1-10 of 10

    • 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. ...
    • Direct search for features in the primordial bispectrum 
      Appleby, Stephen; Gong, Jinn-Ouk; Hazra, Dhiraj Kumar; Shafieloo, Arman; Sypsas, Spyros (Elsevier, 2016)
      We study features in the bispectrum of the primordial curvature perturbation correlated with the reconstructed primordial power spectrum from the observed cosmic microwave background temperature data. We first show how the ...
    • Effective field theory of weakly coupled inflationary models 
      Gwyn, Rhiannon; Palma Quilodrán, Gonzalo; Sakellariadou, Mairi; Sypsas, Spyros (IOP Publishing Ltd and Sissa Medialab srl, 2013-04)
      The application of Effective Field Theory (EFT) methods to inflation has taken a central role in our current understanding of the very early universe. The EFT perspective has been particularly useful in analyzing the ...
    • Evaporating primordial black holes as varying dark energy 
      Nesseris, Savvas; Sapone, Domenico; Sypsas, Spyros (Elsevier, 2020)
      If light enough primordial black holes (PBH) account for dark matter, then its density decreases with time as they lose mass via Hawking radiation. We show that this time-dependence of the matter density can be formulated ...
    • 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 ...
    • 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 ...
    • Scale invariance of the primordial tensor power spectrum 
      Palma Quilodrán, Gonzalo; Pradenas Márquez, Bastián; Riquelme, Walter; Sypsas, Spyros (American Physical Society, 2017)
      Future cosmic microwave background polarization experiments will search for evidence of primordial tensor modes at large angular scales, in the multipole range 4≤≤50. Because in that range there is some mild evidence of ...
    • Seeding Primordial Black Holes in Multifield Inflation 
      Palma Quilodrán, Gonzalo; Sypsas, Spyros; Zenteno, Cristóbal (American Physical Society, 2020)
      The inflationary origin of primordial black holes (PBHs) relies on a large enhancement of the power spectrum Delta(zeta) of the curvature fluctuation zeta at wavelengths much shorter than those of the cosmic microwave ...
    • Shapes and features of the primordial dispectrum 
      Gong, Jinn Ouk; Palma Quilodrán, Gonzalo; Sypsas, Spyros (IOP Publishing Ltd., 2017)
      If time-dependent disruptions from slow-roll occur during inflation, the correlation functions of the primordial curvature perturbation should have scale-dependent features, a case which is marginally supported from the ...