How Gaussian can our Universe be

  title={How Gaussian can our Universe be},
  author={Giovanni Cabass and Enrico Pajer and Fabian Schmidt},
  journal={Journal of Cosmology and Astroparticle Physics},
26 + 18 pages, 2 figures. References added and minor typos corrected. Matches published version 

Figures and Tables from this paper

Primordial Non-Gaussianity
Our current understanding of the Universe is established through the pristine measurements of structure in the cosmic microwave background (CMB) and the distribution and shapes of galaxies tracing
Probing inflation with precision bispectra
This work develops a simple augmented Legendre polynomial basis into a practical and efficient numerical methodology which can be applied to a much wider and more complicated range of bispectrum phenomenology, making an important step forward towards observational pipelines which can directly confront specific models of inflation.
Clustering of primordial black holes with non-Gaussian initial fluctuations
We formulate the two-point correlation function of primordial black holes (PBHs) at their formation time, based on the functional integration approach which has often been used in the context of
Imprints of Oscillatory Bispectra on Galaxy Clustering
Long-short mode coupling during inflation, encoded in the squeezed bispectrum of curvature perturbations, induces a dependence of the local, small-scale power spectrum on long-wavelength
Towards the Limits of Cosmology
  • J. Silk
  • Physics
    Foundations of Physics
  • 2018
The cosmic microwave background has provided a window for probing the initial conditions from which structure evolved and seeded the formation of the galaxies, and the outstanding issues that remain to be resolved are described.
Breaking the single clock symmetry: Measuring single-field inflation non-Gaussian features
Daniele Bertacca, 2, 3 Raul Jimenez, 5 Sabino Matarrese, 2, 3, 6 and Licia Verde 5 Dipartimento di Fisica e Astronomia Galileo Galilei, Università di Padova, 35131 Padova, Italy INFN, Sezione di
Shapes and features of the primordial bispectrum
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
The Black Hole Window on Cosmic Inflation
We develop in this thesis the principles governing the production of our universe's primordial inhomogeneities during its early phase of inflation. As a guiding thread we ask what physics during
Inflation: Theory and Observations
Cosmic inflation provides a window to the highest energy densities accessible in nature, far beyond those achievable in any realistic terrestrial experiment. Theoretical insights into the
A generalized non-Gaussian consistency relation for single field inflation
We show that a perturbed inflationary spacetime, driven by a canonical single scalar field, is invariant under a special class of coordinate transformations together with a field reparametrization of


Spacetime and Geometry: An Introduction to General Relativity
1. Special Relativity and Flat Spacetime. 2. Manifolds. 3. Curvature. 4. Gravitation. 5. The Schwarzchild Solution. 6. More General Black Holes. 7. Perturbation Theory and Gravitational Radiation. 8.
On Separate Universes
(abridged version) The separate universe conjecture states that in General Relativity a density perturbation behaves locally (i.e. on scales much smaller than the wavelength of the mode) as a
Cosmic Clocks
In a perturbed Universe, comoving tracers on a two-dimensional surface of constant observed redshift are at different proper time since the Big Bang. For tracers whose age is known independently, one
Observed galaxy number counts on the lightcone up to second order: II. Derivation
We present a detailed derivation of the observed galaxy number over-density on cosmological scales up to second order in perturbation theory. We include all relativistic effects that arise from
Observational signatures and non-Gaussianities of general single-field inflation
We perform a general study of primordial scalar non-Gaussianities in single field inflationary models. We consider models where the inflaton Lagrangian is an arbitrary function of the scalar field
Planck 2015. XX. Constraints on inflation
We analyse the implications of the Planck data for cosmic inflation. The Planck nominal mission temperature anisotropy measurements, combined with the WMAP large-angle polarization, constrain the
The Observed Squeezed Limit of Cosmological Three-Point Functions
of cosmological perturbation theory on these observables. This makes crucial use of Fermi Normal Coordinates and their conformal generalization, which we introduce here and discuss in detail. As an
Non-Gaussianities due to Relativistic Corrections to the Observed Galaxy Bispectrum
High-precision constraints on primordial non-Gaussianity (PNG) will significantly improve our understanding of the physics of the early universe. Among all the subtleties in using large scale
Cosmic Rulers
We derive general covariant expressions for the six independent observable modes of distortion of ideal standard rulers in a perturbed Friedmann-Robertson-Walker spacetime. Our expressions are
Separate universe simulations
The large-scale statistics of observables such as the galaxy density are chiey determined by their dependence on the local coarse-grained matter density. This dependence can be measured directly and