BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Observing the Big Bang - ECPv5.3.1//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Observing the Big Bang
X-ORIGINAL-URL:https://cosmology.nl
X-WR-CALDESC:Events for Observing the Big Bang
BEGIN:VTIMEZONE
TZID:Europe/Amsterdam
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20220327T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20221030T010000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20220304T133000
DTEND;TZID=Europe/Amsterdam:20220304T170000
DTSTAMP:20260513T083642
CREATED:20220120T174052Z
LAST-MODIFIED:20220306T211521Z
UID:537-1646400600-1646413200@cosmology.nl
SUMMARY:Groningen Winter 2022
DESCRIPTION:Groningen\, March 4th. \nThis meeting will take place in an hybrid format. Here the information for connecting: \nTime: March 4th\, 2022 01:30 PM Amsterdam Time \nJoin Zoom Meeting\nZoom Link\nMeeting ID: 814 0629 4208\nPassword: 874447 \n \n13:30-14:30 CET: Talk by  Sam Young (Leiden University)  \nTitle:  Primordial black holes in the early and late Universe  \nAbstract: \n Primordial black holes (PBHs) are a hypothetical form of black hole (BH)\nwhich may have formed from the collapse of large density perturbations\nin the very early universe. Not only are they a viable and appealing\ndark matter candidate\, but they also provide a unique probe to study the\nsmall-scale physics of the early universe\, as well as potentially being\nthe progenitors for the merging binary BH systems observed by\nLIGO/Virgo. To determine the validity of such models and derive accurate\nconstraints\, we need a good understanding of how\, when and where PBHs\nform\, and how this can depend on primordial non-Gaussianities and phase\ntransitions in the early universe. In this talk I will discuss the\nmotivation to study PBHs and their formation\, before discussing recent\ndevelopments in the field for which I have made contributions. I will\nfocus on effects important for determining the merger rate of binary\nPBHs observable today\, include the effect of non-Gaussianities on the\nabundance\, mass and initial clustering of PBHs\, as well as the\ninteractions of binary PBHs with nearby objects. This will be crucial in\ndetermining whether the progenitor BHs of the LIGO/Virgo binaries are\nprimordial or astrophysical in origin.   \n14:30-14:45 CET: Break  \n14:45-15:45 CET: Talk by  Marko Simonovic (CERN) \nTitle:  Constraints on single-field inflation from the BOSS galaxy survey 
 \nAbstract: \n The last decade has seen a large improvement in theoretical understanding of galaxy clustering on cosmological scales. The culmination of this program was recent CMB-independent measurement of cosmological parameters and optimal analysis of galaxy bispectrum which led to the first constraints on equilateral and orthogonal non-Gaussianity from spectroscopic galaxy surveys. In this talk I will review the main theoretical and practical developments which led to this progress\, with the particular focus on primordial non-Gaussianity. I will also highlight the main lessons we learned so far and discuss further steps that have to be made in order to optimally extract information from the ongoing galaxy surveys such as DESI and Euclid.  \n15:45-16:00 CET: Break  \n16:00-17:00 CET: Talk by   Vanessa Böhm (Berkeley University)  \nTitle: Fast\, accurate and differentiable simulations of weak cosmic lensing \n \nAbstract: \n Upcoming experiments such as the LSST survey (Vera Rubin Observatory) or the EUCLID satellite will probe the weak cosmic shear signal far into the non-gaussian regime. These new datasets mark the end of an era in which power spectra analyses and linear models were close to optimal for extracting cosmological information from weak lensing data. New datasets require non-linear models and inference schemes that can accurately extract information from non-Gaussian signals. In my talk I will explore new avenues for weak gravitational lensing analysis and argue that they all rely on fast and differentiable data models. I will show how automatic differentiation which lies at the heart of deep neural networks can be exploited to develop differentiable N-body simulations and present MADLens\, a fully differentiable weak gravitational lensing simulator that produces non-Gaussian convergence maps at unprecedented accuracy and low computational cost.\n \n17:00 CET:  Borrel
URL:https://cosmology.nl/event/groningen-winter-2022/
LOCATION:room 114 in the Arctic Centre\, A-weg 30\, Groningen\, Arctic Centre\, A-weg 30\, Groningen\, 9718 CW\, Netherlands
CATEGORIES:THC meeting
END:VEVENT
END:VCALENDAR