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X-WR-CALDESC:Events for INPA
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DTSTART;TZID=America/Los_Angeles:20200110T120000
DTEND;TZID=America/Los_Angeles:20200110T130000
DTSTAMP:20260429T210832
CREATED:20191217T235852Z
LAST-MODIFIED:20191217T235852Z
UID:702-1578657600-1578661200@inpa.lbl.gov
SUMMARY:Speaker: Samuel Hinton - University of Queensland
DESCRIPTION:Title:  Challenges and pathways forward in supernova cosmology \nAbstract:  Using the DES photometric supernova cosmology analysis as groundwork\, I will summarise our current analysis methodologies\, from simulations\, to transient classification\, selection effect treatment\, and cosmology. Despite recent improvements in analysis methods\, there still exist fundamental challenges in areas spanning the initial empirical SN Ia model all the way to failing approximations built into cosmology fitters. I will highlight potential solutions to these challenges\, to allow the next generation of surveys to lower the systematic floor and provide improved cosmological constraints. Additionally\, I will also summarise my BAO and pipeline work for surveys like DESI\, and discuss ways I’ve improved scientific workflow to allow more efficient use of researcher time.
URL:https://inpa.lbl.gov/event/speaker-samuel-hinton-university-of-queensland/
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20200117T120000
DTEND;TZID=America/Los_Angeles:20200117T130000
DTSTAMP:20260429T210832
CREATED:20200110T233940Z
LAST-MODIFIED:20200110T234028Z
UID:707-1579262400-1579266000@inpa.lbl.gov
SUMMARY:Speaker: Arnaud De Mattia - IRFU\, CEA\, Université Paris-Saclay
DESCRIPTION:Title: The extended Baryon Oscillation Spectroscopic Survey: clustering measurements\, lessons\, and prospects \nAbstract: In this talk\, I will present the clustering analysis of the ELG (Emission Line Galaxy) sample from the eBOSS (extended Baryon Oscillation Spectroscopic Survey) program of the Sloan Digital Sky Survey and review the other clustering analyses of the eBOSS program\, dedicated to Luminous Red Galaxies and Quasars. I will discuss theoretical\, observational and analysis systematics\, how they were estimated and mitigated\, focusing on the improvements over the last release of the BOSS program in 2016. Specifically\, I will start by presenting the extensive work of the eBOSS collaboration to test model predictions against N-body simulations. The different observational systematics of the eBOSS samples will be reviewed\, as well as the adopted correction schemes and the new analysis techniques used to mitigate residual systematics. Different analysis assumptions and their impact on the clustering signal will be discussed. After a review of eBOSS legacy cosmological measurements\, I will finish by drawing lessons and prospects for future galaxy surveys.
URL:https://inpa.lbl.gov/event/speaker-arnaud-de-mattia-irfu-cea-universite-paris-saclay/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20200124T120000
DTEND;TZID=America/Los_Angeles:20200124T130000
DTSTAMP:20260429T210832
CREATED:20200117T174840Z
LAST-MODIFIED:20200117T174840Z
UID:711-1579867200-1579870800@inpa.lbl.gov
SUMMARY:Speaker: Jiamin Hou - Max-Planck - Institute for Extraterrestrial Physics
DESCRIPTION:Title: Clustering measurements in the final eBOSS quasar sample and their cosmological implications \nAbstract:In this talk I present the clustering analysis of the final extended Baryon Oscillation Spectroscopic Survey (eBOSS) quasar sample at redshift 0.8<z<2.2\, which bridges the redshift gap between the eBOSS LRG and Lyman-alpha measurements. Mapping the evolution of the expansion and growth of structure histories of our Universe provides us with a crucial test of the standard LCDM cosmological scenario. Our analysis includes a detailed modelling of the impact of the non-linear evolution of density fluctuations\, bias\, and redshift-space distortions on the two-point correlation function. Using numerical simulations designed to reproduce the uniqueness of the quasar sample\, we perform extensive validation tests to characterise potential systematic errors induced by theoretical and observational effects. The constraints obtained from anisotropic clustering measurements can be used to test models of gravity on large-scales. However\, these tests require the validation of our analysis techniques in modified gravity scenarios. I present an example of such tests\, based on large numerical simulations of standard and modified gravity models to measure galaxy clustering in redshift space.
URL:https://inpa.lbl.gov/event/speaker-jiamin-hou-max-planck-institute-for-extraterrestrial-physics/
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20200131T120000
DTEND;TZID=America/Los_Angeles:20200131T130000
DTSTAMP:20260429T210832
CREATED:20200128T191114Z
LAST-MODIFIED:20200128T205800Z
UID:716-1580472000-1580475600@inpa.lbl.gov
SUMMARY:Speaker: Ann-Kathrin Schutz - Eberhard Karls University of Tubingen
DESCRIPTION:Title: Full analysis of the background for the search of neutrinoless double beta decay in Gerda\n\nAbstract: The GERmanium Detector Array (Gerda) experiment aims for the discovery of neutrinoless double beta decay (0νββ) decay in 76Ge. It uses HPGe detectors enriched in the isotope 76Ge\, which are directly immersed into liquid argon (LAr). In second phase (Phase II) of Gerda\, the radio-pure cryogenic liquid acts not only as cooling medium for the detectors and passive shielding but also as active shielding. Phase II started data taking in Dec 2015 with the design goal of increasing the sensitivity to T 0ν1/2 = O1026 yr by reducing the background by one order of magnitude. Due to the active veto system detecting LAr scintillation light\, the superior energy resolution and an improved background recognition\, the initial release of Phase II already showed a background rate in the energy region of interest (ROI)\, after pulse shape discrimination (PSD) and liquid argon veto cuts\, in the range of a few counts/(ROI·ton·yr). This made Gerda the first 0νββ experiment being background free up to its design exposure of 100 kg·yr. With the latest data release in mid 2018\, comprising a total exposure of 82.4 kg·yr\, Gerda remained in the background free regime and it is the first experiment to surpass a median sensitivity on the half-life of 1026 yr for 0νββ decay. \nIn this talk\, a full analysis of the background is presented where all available information on the background has been incorporated in order to develop a detailed background model describing the decomposition of the measured energy spectrum. For the first time\, the single- and two-detector data have been combined in a multivariate Bayesian fit approach. Additionally\, the background model focuses further on two prominent features in the energy spectrum: the α events dominating the high energy part of the spectrum and the count rates of the potassium γ-lines at 1525 keV and 1461 keV. Thanks to the granularity of the detector array\, a study of the coincident events in the two-detector data which can provide further information regarding the location of contaminations has been integrated. Using the background model\, important information on the main sources and their locations contributing to the background around\nthe Q-value of the decay (Qββ) can be deduced. Besides\, the spectral shape of the total background around Qββ can be extracted. Both are crucial input informations for reliable results on the 76Ge 0νββ signal search.
URL:https://inpa.lbl.gov/event/speaker-ann-kathrin-schuetz-university-of-tuebingen-in-germany/
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