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X-WR-CALDESC:Events for INPA
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TZOFFSETFROM:-0800
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DTSTART:20180311T100000
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DTSTART:20181104T090000
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20180302T120000
DTEND;TZID=America/Los_Angeles:20180302T130000
DTSTAMP:20260527T041717
CREATED:20180119T185751Z
LAST-MODIFIED:20180228T003105Z
UID:326-1519992000-1519995600@inpa.lbl.gov
SUMMARY:Andre Walker-Loud (LBNL) - Lattice QCD for Neutrinoless Double Beta Decay
DESCRIPTION:In recent years\, lattice QCD has matured to the stage where it is now routine for calculations to be performed at or near the physical pion mass\, with fully controlled extrapolations to the continuum and infinite volume limits. These calculations are predominantly related to flavor physics and heavy quark physics. The application of lattice QCD to nuclear physics is beset by a number of additional challenges which make them exponentially more expensive\, prohibiting the same success so far for low-energy nuclear processes. Algorithmic improvements and the computing power of the next generation supercomputers promises an era in which we will be able to make rigorous\, fully controlled calculations of basic nuclear properties. I will briefly introduce lattice QCD and describe the challenges in applying it to basic nuclear physics. I will then highlight some recent results and outline a strategy for connecting complex\, exotic phenomena such as neutrinoless double beta decay to the fundamental theory of nuclear strong interactions\, Quantum Chromodynamics. aim to test these findings with observations\, using the Dark Energy Survey data currently available.
URL:https://inpa.lbl.gov/event/andre-walker-loud-lbnl-tba-lattice-qcd-calculations-of-0%ce%bd%ce%b2%ce%b2-matrix-elements/
LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20180309T120000
DTEND;TZID=America/Los_Angeles:20180309T130000
DTSTAMP:20260527T041717
CREATED:20180119T190112Z
LAST-MODIFIED:20180119T190112Z
UID:331-1520596800-1520600400@inpa.lbl.gov
SUMMARY:Giorgia Pollina - Unveiling cosmic voids in large-scale structure surveys: the impact of tracer bias
DESCRIPTION:The large-scale structure of the Universe can only be observed directly via luminous tracers of the underlying matter density field. However\, luminous tracers\, such as galaxies\, do not precisely mirror the clustering statistic of the bulk of the cold dark matter distribution: their correlation function (or power spectrum) is biased and depends on various properties of the tracers themselves. Although on small scales this bias is an unestablished function of space and time\, on very large scales it results in a constant offset in the clustering amplitude\, known as linear bias. In this talk we focus on the bias of luminous objects within and around cosmic voids\, enormous under-dense regions of the Universe that occupy the vast majority of its volume. As a remarkable result\, we find that\, within voids\, the relation between matter and galaxy density is always linear and determined by a multiplicative constant. Furthermore\, the value of this constant decreases with the increase of the size of voids and asymptotes to the linear bias. This result opens to the possibility of using such simple relation in other voids studies\, allowing to extend our theoretical understanding of voids (typically defined as depressions in the matter density field) to voids that are identified using galaxies as tracers of the matter density. Ultimately we aim to test these findings with observations\, using the Dark Energy Survey data currently available.
URL:https://inpa.lbl.gov/event/giorgia-pollina-unveiling-cosmic-voids-in-large-scale-structure-surveys-the-impact-of-tracer-bias/
LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20180316T120000
DTEND;TZID=America/Los_Angeles:20180316T130000
DTSTAMP:20260527T041717
CREATED:20180119T190757Z
LAST-MODIFIED:20180228T171248Z
UID:333-1521201600-1521205200@inpa.lbl.gov
SUMMARY:Ana Bonaca (Harvard-CfA) - What are the tidal streams constraining?
DESCRIPTION:Cold stellar streams\, remnants of tidally disrupted globular clusters\, have been employed as exquisite tracers of dark matter in the Milky Way. Because of their different positions in phase space\, different ages\, and different levels of observational scrutiny\, different streams tell us different things about the Galaxy. We employ a Cramer–Rao or Fisher-matrix approach to understand the quantitative information content in the known streams. In simple\, static\, analytic models of the Milky Way\, streams on eccentric orbits contain the most information about the dark-matter shape. For any individual stream\, there are near-degeneracies between dark-matter halo properties and parameters describing the Galactic bulge\, disk and the stream progenitor itself\, but we find that simultaneous fitting of multiple streams ought to constrain all parameters to a precision of a few percent. At this level\, simulated dark matter halos deviate from analytic parametrizations\, so we chart the way forward by discussing constraints streams place on more flexible models of the Galactic gravitational potential.
URL:https://inpa.lbl.gov/event/ana-bonaca-harvard-cfa-desi-mw-science/
LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20180323T120000
DTEND;TZID=America/Los_Angeles:20180323T130000
DTSTAMP:20260527T041717
CREATED:20180119T191700Z
LAST-MODIFIED:20180319T200604Z
UID:336-1521806400-1521810000@inpa.lbl.gov
SUMMARY:Krista Lynne Smith (Stanford) - A New Regime of Optical Variability in AGN: Light Curves from Exoplanet Satellites
DESCRIPTION:The optical light curves of AGN provide a unique window into the conditions and behavior within the accretion disk. The development of a specialized pipeline for AGN science with the unparalleled photometry of exoplanet-hunting satellites allows us to explore new optical variability phenomena. Such data provide an opportunity for direct comparison with X-ray light curves\, and promise to inform models of both accretion physics and the relationship between X-ray and optical emitting regions in the central engine. These data will be critical in learning how to interpret AGN light curves from upcoming large variability surveys like LSST. Finally\, exoplanet mission data have enormous future promise for a multifaceted understanding of accretion processes\, including blazar jets and quasi-periodic oscillations.
URL:https://inpa.lbl.gov/event/krista-lynne-smith-stanford/
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20180326T120000
DTEND;TZID=America/Los_Angeles:20180326T130000
DTSTAMP:20260527T041717
CREATED:20180227T171324Z
LAST-MODIFIED:20180321T152158Z
UID:358-1522065600-1522069200@inpa.lbl.gov
SUMMARY:Dr. Leila Haegel (University of the Balearic Islands\, Spain) - Testing general relativity with gravitational waves
DESCRIPTION:Gravitational waves have been directly detected by the LIGO experiment in 2015. Since then\, five black holes and one neutron star binaries merging have been observed during the two observational runs. The measured signals already provided a large amount of physical results\, from the mass distribution of stellar-masses black holes to the short gamma-ray burst mechanisms through measurement of the expansion rate of the Universe and tests of general relativity. Both detection and analysis of gravitational waves rely on the simulation of the expected signal to be extracted from the noise. As the exact computation of gravitational waveforms is a computationally expensive resource\, physicists are building phenomenological models. I will review the process of designing such models as well as their impact on the physics extracted from the signals.
URL:https://inpa.lbl.gov/event/dr-leila-haegel-university-of-the-balearic-islands-spain/
LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA
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