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http://hdl.handle.net/20.500.12386/23964
Titolo: | Neglecting primordial non-Gaussianity threatens future cosmological experiment accuracy | Autori: | CAMERA, STEFANO CARBONE, Carmelita Fedeli, Cosimo MOSCARDINI, LAURO |
Data pubblicazione: | 2015 | Rivista: | PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY | Numero: | 91 | Fascicolo: | 4 | Da pagina:: | 043533 | Abstract: | Future galaxy redshift surveys aim at probing the clustering of the cosmic large-scale structure with unprecedented accuracy, thus complementing cosmic microwave background experiments in the quest to deliver the most precise and accurate picture ever of our Universe. Analyses of such measurements are usually performed within the context of the so-called vanilla Λ CDM model—the six-parameter phenomenological model which, for instance, emerges from best fits against the recent data obtained by the Planck satellite. Here, we show that such an approach is prone to subtle systematics when the Gaussianity of primordial fluctuations is concerned. In particular, we demonstrate that, if we neglect even a tiny amount of primordial non-Gaussianity—fully consistent with current limits—we shall introduce spurious biases in the reconstruction of cosmological parameters. This is a serious issue that must be properly accounted for in view of accurate (as well as precise) cosmology. | Acknowledgments: | ACKNOWLEDGMENTS We thank Alan Heavens, Roy Maartens, and Mário G. Santos for clarifications and comments, and Ben Granett for further support. S. C. acknowledges support from FCT-Portugal under Post-Doctoral Grant No. SFRH/BPD/80274/2011 and from the European Research Council under the EC FP7 Grant No. 280127. C. C. acknowledges financial support from the INAF Fellowships Programme 2010 and from the European Research Council through the Darklight Advanced Research Grant (No. 291521). C. F. has received funding from the European Commission Seventh Framework Programme (FP7/2007-2013) under Grant Agreement No. 267251. L. M. acknowledges financial contributions from contracts ASI/INAF No. I/023/12/0 “Attività relative alla fase B2/C per la missione Euclid,” PRIN MIUR 2010-2011 “The dark Universe and the cosmic evolution of baryons: from current surveys to Euclid,” and PRIN INAF 2012 “The Universe in the box: multiscale simulations of cosmic structure.” S. C. also wishes to thank Libellulart Officina DiSegni for hospitality during the development of this work. | URI: | http://hdl.handle.net/20.500.12386/23964 | URL: | https://journals.aps.org/prd/abstract/10.1103/PhysRevD.91.043533 | ISSN: | 1550-7998 | DOI: | 10.1103/PhysRevD.91.043533 | Bibcode ADS: | 2015PhRvD..91d3533C | Fulltext: | open |
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