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SUMMARY:The relativistic bispectrum of dark matter
DTSTART;VALUE=DATE-TIME:20190212T133000Z
DTEND;VALUE=DATE-TIME:20190212T150000Z
DTSTAMP;VALUE=DATE-TIME:20190820T184621Z
UID:indico-event-8844@ictp.it
DESCRIPTION:\n Abstract. We discuss relativistic corrections to large scal
e structure observables. These are expected to yield contributions compara
ble to fNL of a few\, and therefore potentially observable in future surve
ys. We then focus on the large scale structure bispectrum in the squeezed
limit\, which couples large with small scales. Since relativity is importa
nt at large scales and non-linear loop corrections are important at small
scales\, the proper calculation of the observed bispectrum in this limit r
equires a non-linear relativistic calculation. We compute the matter bispe
ctrum in general relativity in the weak field approximation. The calculati
on is as involved as existing second-order results. For the bispectrum\, w
e find relativistic corrections to be as large as the newtonian result in
the squeezed limit. In that limit relativistic one-loop contributions\, wh
ich we compute for the first time\, can be as large as tree level results
and have the sa dependence as a primordial local non-Gaussianity signal wh
ere k is the momentum approaching zero. Moreover\, we find the time depend
ence of the relavistic corrections to the bispectrum to be the same as tha
t of a primordial non-Gaussianity signal.\n\nhttp://indico.ictp.it/event/8
844/
LOCATION:ICTP Leonardo Building - Luigi Stasi Seminar Room
URL:http://indico.ictp.it/event/8844/
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