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X-WR-CALDESC:Events for Observing the Big Bang
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DTSTART:20150329T010000
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DTSTART:20151025T010000
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DTSTART;TZID=Europe/Amsterdam:20151002T140000
DTEND;TZID=Europe/Amsterdam:20151002T180000
DTSTAMP:20260513T140835
CREATED:20160321T113520Z
LAST-MODIFIED:20160321T115532Z
UID:196-1443794400-1443808800@cosmology.nl
SUMMARY:Utrecht Fall 2015
DESCRIPTION:14h00 – 15h00 \nMathias Garny (CERN) \nUV dependence of the large scale structure power spectrum \nWe discuss a non-perturbative equation for the power spectrum of large-scale density perturbations at long wavelength. It is based on equal-time consistency relations and an operator product expansion scheme\, and encapsulates the dependence on UV modes into a number of response functions in a modified cosmology. We argue that they depend only weakly on the short-scale perturbation spectrum\, and discuss implications for the leading coefficients in the effective field theory approach to large-scale structure formation. \n15h45 – 16h30 \nCora Uhlemann (LMU\, Munich) \nLarge scale structure formation with the Schrödinger method  \nWhen describing large-scale structure formation one is interested in the dynamics of a large collection of dark matter particles that interact only gravitationally. Even though this problem seems quite simple from a conceptual point of view\, no sufficiently general solution of the underlying equation\, the Vlasov-Poisson equation\, is known. Therefore one usually has to resort to N-body simulations which tackle the problem numerically. Analytical methods are based on the dust model which describes cold dark matter as a pressureless fluid characterized by density and velocity. This model works up to the quasi-linear regime but eventually fails when multiple streams form that are important for halo formation but lead to singularities. We present the so-called Schrödinger method\, based on the Wigner distribution obtained from a wave function fulfilling the Schroedinger-Poisson equation\, as a replacement for the dust model. We show that its evolution equation approximates the Vlasov equation in a controlled way\, cures the shell-crossing singularities and is able to describe regions of multi-streaming. We explain how the Schroedinger method thereby incorporates higher cumulants self-consistently and closes the cumulant hierarchy instead of truncating it. \n17h00 – 18h00 Drinks
URL:https://cosmology.nl/event/utrecht-fall-2015/
LOCATION:Institute for Theoretical Physics Utrecht\,  Princetonplein 5\, Utrecht\, 3584 CE\, Netherlands
CATEGORIES:THC meeting
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