# How Gaussian can our Universe be

@article{Cabass2016HowGC, title={How Gaussian can our Universe be}, author={Giovanni Cabass and Enrico Pajer and Fabian Schmidt}, journal={Journal of Cosmology and Astroparticle Physics}, year={2016}, volume={2017}, pages={003-003} }

26 + 18 pages, 2 figures. References added and minor typos corrected. Matches published version

## 43 Citations

Primordial Non-Gaussianity

- Physics
- 2019

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

- BiologyJournal of Cosmology and Astroparticle Physics
- 2021

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

- PhysicsProgress of Theoretical and Experimental Physics
- 2019

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

- PhysicsJournal of Cosmology and Astroparticle Physics
- 2018

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

- PhysicsFoundations 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

- PhysicsPhysical Review D
- 2022

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

- Physics
- 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…

The Black Hole Window on Cosmic Inflation

- Physics
- 2020

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

- Physics
- 2022

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

- Physics
- 2017

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…

## References

SHOWING 1-10 OF 107 REFERENCES

Spacetime and Geometry: An Introduction to General Relativity

- Physics
- 2003

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

- Physics
- 2015

(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

- Physics
- 2013

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

- Physics
- 2014

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

- Physics
- 2007

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

- Physics
- 2015

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

- Physics
- 2013

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

- Physics
- 2016

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

- Physics
- 2012

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

- Physics
- 2015

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…