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X-WR-CALDESC:Events for INPA
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DTSTART:20190310T100000
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DTSTART;TZID=America/Los_Angeles:20190201T120000
DTEND;TZID=America/Los_Angeles:20190201T130000
DTSTAMP:20260526T124156
CREATED:20181107T194304Z
LAST-MODIFIED:20190125T184855Z
UID:471-1549022400-1549026000@inpa.lbl.gov
SUMMARY:Hillary Child - Nonlinear Structure Formation at Two Scales: from Bispectrum Baryon Acoustic Oscillations to Evolution of Halo Profiles
DESCRIPTION:The “cosmic web” of dark matter halos forms via the collapse of post-inflation density fluctuations. While linear perturbation theory describes this process well at large scales and low densities\, it fails at small scales and high densities. I explore two facets of nonlinear structure formation that constrain cosmology: at mildly nonlinear scales\, measuring the baryon acoustic oscillation (BAO) distance scale in the bispectrum\, and at deeply nonlinear scales\, tracking the evolution of simulated dark matter halo profiles.\n\nAt mildly nonlinear scales\, the BAO distance scale constrains the expansion history of the universe and dark energy. The BAO feature has been detected in both the three-point correlation function and the bispectrum\, but challenges remain in fully exploiting three-point data. I present a strategy to select triangle configurations that maximize the amplitude of the BAO signal in the bispectrum. A relatively small set of bispectrum measurements can improve constraints on the BAO length scale over power spectrum measurements alone.\n\nI next turn to the internal structure of dark matter halos\, whose formation is highly nonlinear. The spherically-averaged density of a halo is well described by the Navarro-Frenk-White (NFW) profile\, a function of two parameters: concentration\, which describes the density of the central region of the halo\, and halo mass. These two parameters are correlated\, and the resulting concentration-mass (c-M) relation is sensitive to cosmological parameters. I present a robust measurement of the c-M relation from the largest ever sample of simulated halos (~30 million) and track the evolution of individual halos to connect halo formation time and concentration.
URL:https://inpa.lbl.gov/event/giovanni-benato-ucb-lbl/
LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20190208T120000
DTEND;TZID=America/Los_Angeles:20190208T130000
DTSTAMP:20260526T124156
CREATED:20181107T194431Z
LAST-MODIFIED:20190205T180628Z
UID:473-1549627200-1549630800@inpa.lbl.gov
SUMMARY:Sinead Griffin (LBL) - Materials considerations for New Dark Matter Detectors
DESCRIPTION:New discoveries in quantum information science and in dark matter detection rely on finding more sensitive detectors than those in state-of-the-art experiments. Traditional detector technologies\, based on nuclear and electron scattering\, have a lower bound on their sensitivity depending on the target’s mass and bandgap. We investigate two classes of new low-threshold detector target materials — Dirac electrons and optical phonons — using first-principles calculations. We discuss how the dark matter/target interaction can be optimized using chemical and physical engineering\, and present the target reach for these new dark matter detection proposals.
URL:https://inpa.lbl.gov/event/sinead-griffin-lbl/
LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20190215T120000
DTEND;TZID=America/Los_Angeles:20190215T130000
DTSTAMP:20260526T124156
CREATED:20181107T194600Z
LAST-MODIFIED:20190206T164328Z
UID:475-1550232000-1550235600@inpa.lbl.gov
SUMMARY:Alexander Fieguth (Stanford) - Recent results of the Xenon-1t dark matter experiment
DESCRIPTION:Beyond the Standard Model of particle physics there exists a form of matter\, which seems to be dark in all interaction channels but in its gravitational influence. The nature of this major constituent of the universe is still not understood. The assumption that it is made up of particles which can possibly leave a trace in any detection channel is an established concept since decades. \nWeakly Interacting Massive Particles (WIMPs) are one of the promising candidates for dark matter constituents. The hunt for a direct detection of a WIMP scattering off a target nucleus on earth is ongoing and pursued with larger efforts than ever before. Among different experiments\, the dual-phase xenon time projection chambers are the most sensitive detectors for scatterings between WIMPs above a few GeV/c^2 and normal matter. The XENON1T experiment located at LNGS is such a detector. Using an exposure of one (tonne x yr) a null-result was obtained and this way the parameter space was probed down to a minimum of 4.1 x 10^(-47) cm^2 for a 30 GeV/c^2 WIMP at 90% C.L. A crucial aspect behind its sensitivity is the mitigation and understanding of background sources mimicking a WIMP signal. Notably\, the rate of electronic recoils in the detector (82^(+5)_(−3) (sys.) ± 3 (stat)) events/(tonne×yr×keV) is the lowest achieved in any dark matter detector. \nAn introduction to the general direct detection principle will be given in this talk. Furthermore\, the experimental picture of direct dark matter search will be introduced with a focus on the results from the XENON1T experiment. In addition\, an outlook on recent efforts to open up for scenarios beyond the vanilla dark matter search\, e.g. the interaction of WIMPS purely with pions within the nucleus\, will be included. Finally\, an insight into the possibilities a large liquid xenon low background detector offers for physics channels beyond the dark matter search will be given.
URL:https://inpa.lbl.gov/event/alexander-fieguth-stanford/
LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20190222T120000
DTEND;TZID=America/Los_Angeles:20190222T130000
DTSTAMP:20260526T124156
CREATED:20181107T194732Z
LAST-MODIFIED:20190221T172729Z
UID:477-1550836800-1550840400@inpa.lbl.gov
SUMMARY:Jia Liu (Princeton) - Nonlinear cosmology with massive neutrinos
DESCRIPTION:The non-zero mass of neutrinos suppresses the growth of cosmic structure on small scales. Since the level of suppression depends on the masses of the three active neutrino species\, the evolution of large-scale structure is a promising tool to constrain the total mass of neutrinos and possibly shed light on the mass hierarchy. I will discuss recent progress and future prospects to constrain the neutrino mass sum with cosmology\, with a focus on the nonlinear regime.
URL:https://inpa.lbl.gov/event/jia-liu-princeton/
LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA
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