Recent work has shown that the local non-Gaussianity parameterfNL induces a scale dependent bias, whose amplitude is growing with scale. Here we firstrederive this result within the context of the peakbackground split formalism and showthat it only depends on the assumption of universality of the mass function, assuming thatthe halo bias only depends on the mass. We then use the extended PressSchechterformalism to argue that this assumption may be violated and that the scale dependent biaswill depend on other properties, such as the merging history of halos. In particular, in thelimit of recent mergers we find that the effect is suppressed. Next we use these predictionsin conjunction with a compendium of large scale data to put a limit on the value offNL. Whencombining all data assuming that the halo occupation depends only on the halo mass, we get a limitof 29(65)
Url:

• https://api.istex.fr/document/6D3A5AFAAF0BD8A2D181EE523B82A70E926795DA/fulltext/pdf

DOI: 10.1088/1475-7516/2008/08/031

Affiliations:

• Suisse, États-Unis
• Canton de Zurich, New Jersey
• Princeton (New Jersey), Zurich
• Université de Princeton, Université de Zurich

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Links toward previous steps (curation, corpus...)

• to stream Main, to step Corpus: 000863
• to stream Main, to step Curation: 000863

---

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<div type="abstract">Recent work has shown that the local non-Gaussianity parameterfNL induces a scale dependent bias, whose amplitude is growing with scale. Here we firstrederive this result within the context of the peakbackground split formalism and showthat it only depends on the assumption of universality of the mass function, assuming thatthe halo bias only depends on the mass. We then use the extended PressSchechterformalism to argue that this assumption may be violated and that the scale dependent biaswill depend on other properties, such as the merging history of halos. In particular, in thelimit of recent mergers we find that the effect is suppressed. Next we use these predictionsin conjunction with a compendium of large scale data to put a limit on the value offNL. Whencombining all data assuming that the halo occupation depends only on the halo mass, we get a limitof 29(65)</div>

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