G
Giovanni Marozzi
Researcher at University of Geneva
Publications - 66
Citations - 2952
Giovanni Marozzi is an academic researcher from University of Geneva. The author has contributed to research in topics: Cosmological perturbation theory & Dark energy. The author has an hindex of 30, co-authored 60 publications receiving 2647 citations. Previous affiliations of Giovanni Marozzi include University of Pisa & Institut d'Astrophysique de Paris.
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Generation of fluctuations during inflation: Comparison of stochastic and field-theoretic approaches
TL;DR: In this article, it was shown that the stochastic and standard field-theoretical approaches produce exactly the same results for the amount of light massive scalar field fluctuations generated during inflation in the leading order of the slow-roll approximation.
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Light-cone averaging in cosmology: formalism and applications
Maurizio Gasperini,Maurizio Gasperini,Giovanni Marozzi,Fabien Nugier,Gabriele Veneziano,Gabriele Veneziano +5 more
TL;DR: In this paper, a general gauge invariant formalism for defining cosmological averages that are relevant for observations based on light-like signals is presented, which involve either null hypersurfaces corresponding to a family of past light-cones or compact surfaces given by their intersection with timelike hypersurface.
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Stochastic growth of quantum fluctuations during slow-roll inflation
TL;DR: In this article, the growth of the mean square of quantum fluctuations of test fields with small effective mass during a slowly changing, nearly de Sitter stage which takes place in different inflationary models is investigated.
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Average and dispersion of the luminosity-redshift relation in the concordance model
Ido Ben-Dayan,Maurizio Gasperini,Maurizio Gasperini,Giovanni Marozzi,Giovanni Marozzi,Fabien Nugier,Gabriele Veneziano,Gabriele Veneziano,Gabriele Veneziano +8 more
TL;DR: In this paper, the effects of the realistic stochastic background of perturbations of the so-called concordance model on the combined light-cone and ensemble average of various functions of the luminosity distance, and on their variance, as functions of redshift.
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Do stochastic inhomogeneities affect dark-energy precision measurements?
TL;DR: The effect of a stochastic background of cosmological perturbation on the luminosity-redshift relation is computed to second order through a recently proposed covariant and gauge-invariant light-cone averaging procedure, implying that such perturbations cannot mimic a sizable fraction of dark energy.