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SUMMARY:Relativistic effects and primordial non-Gaussianity in the matter
density fluctuation
DTSTART;VALUE=DATE-TIME:20151214T132100Z
DTEND;VALUE=DATE-TIME:20151214T134200Z
DTSTAMP;VALUE=DATE-TIME:20200927T074919Z
UID:indico-contribution-786758@indico.cern.ch
DESCRIPTION:Speakers: Jaiyul Yoo (University of Zurich)\nWe present the th
ird-order analytic solution of the matter density fluctuation in the prope
r-time hypersurface of nonrelativistic matter flows by solving the nonline
ar general relativistic equations. The proper-time hypersurface provides
a coordinate system that a local observer can set up without knowledge bey
ond its neighborhood\, along with physical connections to the local Newton
ian descriptions in the relativistic context. The initial condition of ou
r analytic solution is set up by the curvature perturbation in the comovin
g gauge\, clarifying its impact on the nonlinear evolution. We compute th
e effective non-Gaussian parameters due to the nonlinearity in the relativ
istic equations. With proper coordinate rescaling\, we show that gravity r
espects the equivalence principle the equivalence principle is respected a
nd the relativistic effect vanishes in the large-scale limit.\n\nhttps://i
ndico.cern.ch/event/336103/contributions/786758/
LOCATION:International Conference Centre Geneva Level -1\, Room 17
URL:https://indico.cern.ch/event/336103/contributions/786758/
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