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TZID:America/Los_Angeles
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TZOFFSETFROM:-0800
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DTSTART:20170312T100000
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DTSTART;TZID=America/Los_Angeles:20170505T120000
DTEND;TZID=America/Los_Angeles:20170505T130000
DTSTAMP:20260527T220318
CREATED:20170427T184346Z
LAST-MODIFIED:20170427T184346Z
UID:226-1493985600-1493989200@inpa.lbl.gov
SUMMARY:Daniel Dwyer (LBNL) - Evidence against sterile neutrinos from the Daya Bay Experiment
DESCRIPTION:Prevailing models of antineutrino emission by nuclear reactors do not\nagree with observations.  This discrepancy has been considered\npossible evidence for neutrino oscillation to non-interacting\, or\nsterile\, neutrino states.  Although the existence of sterile neutrinos\nwould have profound implications\, a variety of measurements by the\nDaya Bay Experiment disfavor sterile models.  I will summarize these\nobservations with a particular focus on the latest result: a precise\nmeasurement of the antineutrino flux versus reactor fuel burn-up.\nI’ll wrap up with a provocative question: does any compelling evidence\nfor sterile neutrinos remain?
URL:https://inpa.lbl.gov/event/daniel-dwyer-lbnl-evidence-against-sterile-neutrinos-from-the-daya-bay-experiment/
LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20170512T120000
DTEND;TZID=America/Los_Angeles:20170512T130000
DTSTAMP:20260527T220318
CREATED:20170329T170150Z
LAST-MODIFIED:20170501T155309Z
UID:210-1494590400-1494594000@inpa.lbl.gov
SUMMARY:Jessica Lu (UCB) - New Developments in Adaptive Optics: Wide Fields and Precise PSFs
DESCRIPTION:Adaptive optics correct for the blurring effects of the Earth’s atmosphere. However\, most AO systems today suffer from limited fields of view and point spread functions that vary over time and position. I will present results from several experiments to overcome these limitations. We have deployed a ground-layer adaptive optics experiment on the UH 2.2 m telescope on Maunakea to test the AO image quality over fields of view as large as 20 arcminutes. This experiment is a key first step in understanding whether a GLAO system would be feasible for other 8-10 m telescopes equipped with wide-field multi-object spectrographs. We are currently investigating the science feasibility of such a system for Keck. I will also present our efforts to reconstruct the AO point spread function and deliver more precise scientific measurements from Keck’s narrow-field AO system. Initial science applications include close binaries\, quasar host galaxies\, and the Galactic Center. Future cases include strongly lensed galaxies and supernovae\, black hole hunting with astrometric microlensing\, and direct imaging of exoplanets.
URL:https://inpa.lbl.gov/event/jessica-lu-ucb/
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20170519T120000
DTEND;TZID=America/Los_Angeles:20170519T130000
DTSTAMP:20260527T220318
CREATED:20170303T221941Z
LAST-MODIFIED:20170512T203955Z
UID:182-1495195200-1495198800@inpa.lbl.gov
SUMMARY:Jon Ouellet (MIT) - ABRACADABRA: A New Approach to the Search for Axion Dark Matter
DESCRIPTION:The evidence for the existence of Dark Matter is well supported by\nmany cosmological observations. But we have not yet been able to\ndetermine how this new type of matter fits into our understanding of\nthe Universe on the smallest scales. Separately\, long standing\nproblems within the Standard Model point to new weakly interacting\nparticles to help explain away unnatural fine-tunings. The axion was\noriginally proposed to explain the Strong-CP problem\, but was\nsubsequently shown to be a strong candidate for explaining the Dark\nMatter abundance of the Universe.  ABRACADABRA is a proposed\nexperiment to search for ultralight axion Dark Matter\, with a focus on\nthe mass range $10^{-14} \lesssim m_a \lesssim 10^{-6}$\\,eV. We search\nfor these axions and other axion like particles (ALPs) through a\nmodification to Maxwell’s equations\, which cause strong magnetic\nfields to source weak oscillating electrical currents parallel to the\nfield. These weak currents can be detected through the magnetic fields\nthat they generate. To see these\, ABRACADABRA will use highly\nsensitive SQUID magnetometers in a very low noise environment. At\nMIT\, we are building a 10\\,cm scale prototype that will quickly be\nsensitive to untested regions of parameter space. In the long term\, we\nhope to scale ABRACADABRA to a 1\\,m$^3$ scale detector\, which could be\nsensitive enough to probe the QCD axion scale.
URL:https://inpa.lbl.gov/event/jon-ouellet-mit-abracadabra/
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20170526T120000
DTEND;TZID=America/Los_Angeles:20170526T130000
DTSTAMP:20260527T220318
CREATED:20170329T170324Z
LAST-MODIFIED:20170428T170154Z
UID:212-1495800000-1495803600@inpa.lbl.gov
SUMMARY:Titouan Lazeyras (MPA) - Dark matter halo bias from separate universe sim-ulations
DESCRIPTION:The large-scale local bias parameters of dark matter halos are essential to\ndescribe the statistics of halos and galaxies on large scales\, as well as for\nthe halo model of the matter distribution. Using so-called separate universe\nsimulations\, we recently obtained precise measurements of the three leading\nbias parameters. For b2 and b3\, these are the most precise measurements\nto date. We compare our results with bias parameters obtained from two\nand three points cross-correlation functions and with theoretical predictions\nfrom the excursion set peaks (ESP) model.\nUsing the same set of simulations\, we further investigate halo assembly bias\,\ni.e. the dependence of the halo bias on properties other than the halo mass.\nWe focus on four halo properties : halo concentration\, spin\, ellipticity and\nmass accretion rate. We measure assembly bias for b1 and nd good agree-\nment with previous studies. Furthermore\, we present results for assembly\nbias in b2 which are among the rst ones and most precise to date. To try\nand better understand the physical mechanisms behind assembly bias\, we\nalso look at the joint dependence of bias on two halo properties in addition\nto the mass.
URL:https://inpa.lbl.gov/event/titouan-lazeyras-mpa/
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