BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Maria Archidiacono DTSTART:20200504T120000Z DTEND:20200504T130000Z DTSTAMP:20260404T055038Z UID:CamCosmoLunch/1 DESCRIPTION:Title: The challenge of neutrino mass detection from cosmology\n by Maria Archidiacono as part of Cambridge cosmology lunch\n\n\nAbstract\n Massive neutrinos modify the expansion history of the Universe and the for mation of structures. Up-to-date cosmological data can provide very tight\ , yet model dependent\, upper limits on the neutrino mass sum. In the next decade one of the goals of precision cosmology will be to pin down the ab solute neutrino mass. In this talk I will discuss the physical effects ind uced by massive neutrinos on cosmological observables\, reviewing current constraints and elaborating on their interpretation. I will then focus on the theoretical challenges of the analysis of data from upcoming galaxy su rveys\, showing how cosmology can detect a non-zero neutrino mass.\n\nIf y ou have a question about this talk\, please contact David Stefanyszyn.\n LOCATION:https://master.researchseminars.org/talk/CamCosmoLunch/1/ END:VEVENT BEGIN:VEVENT SUMMARY:Austin Joyce (University of Amsterdam) DTSTART:20200511T120000Z DTEND:20200511T130000Z DTSTAMP:20260404T055038Z UID:CamCosmoLunch/2 DESCRIPTION:by Austin Joyce (University of Amsterdam) as part of Cambridge cosmology lunch\n\nAbstract: TBA\n\nIf you have a question about this tal k\, please contact David Stefanyszyn.\n LOCATION:https://master.researchseminars.org/talk/CamCosmoLunch/2/ END:VEVENT BEGIN:VEVENT SUMMARY:Jai-Chan Hwang (Kyungpook/DAMTP) DTSTART:20200518T120000Z DTEND:20200518T130000Z DTSTAMP:20260404T055038Z UID:CamCosmoLunch/3 DESCRIPTION:Title: Cosmological perturbation theory\nby Jai-Chan Hwang (Kyun gpook/DAMTP) as part of Cambridge cosmology lunch\n\n\nAbstract\nCosmologi cal perturbation theory is an important theoretical pillar in the developm ent and success of modern cosmology. Using the ADM (3+1) formulation of Ei nstein’s gravity a perturbation analysis valid to fully nonlinear and ex act order is possible. Being fully nonlinear and exact it includes any ord er perturbation expansion as well as the post-Newtonian approximation. We will explain some consequences of this formulation in cosmology and astrop hysics. A related work we have devoted during our stay in DAMTP will be ex plained as well.\n\nIf you have a question about this talk\, please contac t David Stefanyszyn.\ n LOCATION:https://master.researchseminars.org/talk/CamCosmoLunch/3/ END:VEVENT BEGIN:VEVENT SUMMARY:Mat Madhavacheril (Perimeter Institute) DTSTART:20200601T120000Z DTEND:20200601T130000Z DTSTAMP:20260404T055038Z UID:CamCosmoLunch/5 DESCRIPTION:Title: Cosmological applications of the kSZ effect\nby Mat Madha vacheril (Perimeter Institute) as part of Cambridge cosmology lunch\n\n\nA bstract\nPercent level measurements of the kSZ effect (due to bulk motion of free electrons) will be possible with upcoming CMB and galaxy surveys\, so it is timely to ask what science can be extracted with such measuremen ts. I will discuss how recasting kSZ tomography as a bispectrum measuremen t allows for a unified framework under which the “galaxy optical depth d egeneracy” problem becomes clear\; the cosmic velocity field and an astr ophysical power spectrum involving the electron density appear together. H owever\, these are degenerate only up to an overall amplitude. I discuss h ow scale-dependent effects like those due to primordial non-Gaussianity or dark energy perturbations can be constrained with kSZ (with factors of >2 x improvement on fNL possible with future surveys). I will also discuss a way to break the optical depth degeneracy using the dispersion measures of fast radio bursts (FRBs) allowing for strong constraints on sigma8. Final ly\, I discuss calibration of baryonic feedback in weak lensing measuremen ts using kSZ measurements of the electron density profile.\n LOCATION:https://master.researchseminars.org/talk/CamCosmoLunch/5/ END:VEVENT BEGIN:VEVENT SUMMARY:Marika Asgari (University of Edinburgh) DTSTART:20200608T120000Z DTEND:20200608T130000Z DTSTAMP:20260404T055038Z UID:CamCosmoLunch/6 DESCRIPTION:Title: Understanding the dark universe with observational cosmology< /a>\nby Marika Asgari (University of Edinburgh) as part of Cambridge cosmo logy lunch\n\n\nAbstract\nCosmology is a new and fast growing field\, owin g this growth to both new technology and statistical methods in imaging an d data processing. It is believed that we can explain the cosmology of the entire Universe using a handful of parameters through the standard cosmol ogical model. This model has been very successful in predicting the distri bution of galaxies and matter\, as well as very early measurements of cosm ic microwave background radiation. As the volume of data is growing we are starting to see cracks in this simple picture of the Universe\, through t ensions between the results of different observational analyses.\n\nIn thi s talk I will focus on the analysis of the data from the kilo degree surve y (KiDS). KiDS is a purpose-built gravitational lensing survey with high q uality images and a wide photometric coverage\, resulting in very high fid elity data. This dataset\, therefore\, provides an excellent playground wh ere we can test our methods in preparation for future weak lensing surveys . Already the first 450 degrees of the KiDS data shows a mild tension with CMB results from the Planck satellite\, which has sparked both skepticism and excitement within the community. I will go through the systematics th at can affect the results and methods to mitigate them. I will also show r esults from the combination of KiDS and the dark energy survey (DES). Comb ining probes of cosmology can break degeneracies in the parameter space\, resulting in tighter constraints. I will finally show results for the comb ination of KiDS with spectroscopic galaxy surveys.\n LOCATION:https://master.researchseminars.org/talk/CamCosmoLunch/6/ END:VEVENT BEGIN:VEVENT SUMMARY:Cora Dvorkin (Harvard University) DTSTART:20200615T120000Z DTEND:20200615T130000Z DTSTAMP:20260404T055038Z UID:CamCosmoLunch/7 DESCRIPTION:by Cora Dvorkin (Harvard University) as part of Cambridge cosm ology lunch\n\nLecture held in CMS \, Pav.B\, CTC Common Room (B1.19).\nAb stract: TBA\n LOCATION:https://master.researchseminars.org/talk/CamCosmoLunch/7/ END:VEVENT BEGIN:VEVENT SUMMARY:Dan Green (UCSD) DTSTART:20200622T120000Z DTEND:20200622T130000Z DTSTAMP:20260404T055038Z UID:CamCosmoLunch/8 DESCRIPTION:by Dan Green (UCSD) as part of Cambridge cosmology lunch\n\nLe cture held in CMS \, Pav.B\, CTC Common Room (B1.19).\nAbstract: TBA\n LOCATION:https://master.researchseminars.org/talk/CamCosmoLunch/8/ END:VEVENT BEGIN:VEVENT SUMMARY:Matias Zaldarriaga DTSTART:20200629T120000Z DTEND:20200629T130000Z DTSTAMP:20260404T055038Z UID:CamCosmoLunch/9 DESCRIPTION:by Matias Zaldarriaga as part of Cambridge cosmology lunch\n\n Lecture held in CMS \, Pav.B\, CTC Common Room (B1.19).\nAbstract: TBA\n LOCATION:https://master.researchseminars.org/talk/CamCosmoLunch/9/ END:VEVENT BEGIN:VEVENT SUMMARY:Eva Silverstein (Stanford) DTSTART:20200706T120000Z DTEND:20200706T130000Z DTSTAMP:20260404T055038Z UID:CamCosmoLunch/10 DESCRIPTION:by Eva Silverstein (Stanford) as part of Cambridge cosmology l unch\n\nLecture held in CMS \, Pav.B\, CTC Common Room (B1.19).\nAbstract: TBA\n LOCATION:https://master.researchseminars.org/talk/CamCosmoLunch/10/ END:VEVENT END:VCALENDAR