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Generic inference of inflation models by local non-Gaussianity

Published online by Cambridge University Press:  01 July 2015

Sebastian Dorn ,
Erandy Ramirez ,
Kerstin E. Kunze ,
Stefan Hofmann  and
Torsten A. Enßlin
Sebastian Dorn
Affiliation:
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D-85748 Garching, Germany email: sdorn@mpa-garching.mpg.de
Erandy Ramirez
Affiliation:
Instituto de Ciencias Nucleares, UNAM A. Postal 70-543, Mexico D.F. 04510, Mexico
Kerstin E. Kunze
Affiliation:
Departamento de Física Fundamental and IUFFyM, Universidad de Salamanca, Plaza de la Merced s/n, 37008 Salamanca, Spain
Stefan Hofmann
Affiliation:
Arnold Sommerfeld Center for Theoretical Physics, Ludwigs-Maximilians-Universität München, Theresienstraße 37, D-80333 Munich, Germany
Torsten A. Enßlin
Affiliation:
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D-85748 Garching, Germany email: sdorn@mpa-garching.mpg.de Ludwigs-Maximilians-Universität München, Geschwister-Scholl-Platz 1, D-80539 Munich, Germany
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Abstract

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The presence of multiple fields during inflation might seed a detectable amount of non-Gaussianity in the curvature perturbations, which in turn becomes observable in present data sets like the cosmic microwave background (CMB) or the large scale structure (LSS). Within this proceeding we present a fully analytic method to infer inflationary parameters from observations by exploiting higher-order statistics of the curvature perturbations. To keep this analyticity, and thereby to dispense with numerically expensive sampling techniques, a saddle-point approximation is introduced whose precision has been validated for a numerical toy example. Applied to real data, this approach might enable to discriminate among the still viable models of inflation.

Keywords

cosmology: early universecosmology: cosmic microwave backgroundmethods: data analysismethods: statistical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Symposium S306: Statistical Challenges in 21st Century Cosmology , May 2014 , pp. 51 - 53
Copyright
Copyright © International Astronomical Union 2015 

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