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DTSTART;TZID=America/Los_Angeles:20220107T120000
DTEND;TZID=America/Los_Angeles:20220107T130000
DTSTAMP:20260428T134339
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SUMMARY:NO VIRTUAL INPA SEMINAR
DESCRIPTION:
URL:https://inpa.lbl.gov/event/no-virtual-inpa-seminar-8/
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20220114T120000
DTEND;TZID=America/Los_Angeles:20220114T130000
DTSTAMP:20260428T134339
CREATED:20220110T051845Z
LAST-MODIFIED:20220110T051845Z
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SUMMARY:VIRTUAL INPA SEMINAR | Matthew Ho (Carnegie Mellon)
DESCRIPTION:Speaker: Matthew Ho (Carnegie Mellon) \nTitle: Galaxy Cluster Mass Estimation Using Deep Learning  \nAbstract: \nIn this talk\, I will discuss how we use modern deep learning models to infer galaxy cluster masses with high precision\, reliable uncertainty\, and computational efficiency. I will describe our work in using Convolutional Neural Networks (CNNs) to mitigate systematics in the virial scaling relation to produce dynamical mass estimates of galaxy clusters\, using projected galaxies\, with remarkably low bias and scatter. I will also discuss how we can recover and empirically verify Bayesian uncertainties on deep learning mass predictions using variational weight distributions. I will describe how we’ve validated our methods on real observational systems like the Coma\, CLASH\, and HeCS clusters as well as projections for how we can use these models to study cluster cosmology using data from current and upcoming sky surveys. Lastly\, I will mention results from our ongoing work on combining multi-wavelength observables to produce fully informed observational probes of cluster dark matter.\n\n\n\n\n\n\n\n\n\nJoin Zoom Meeting\n\nhttps://lbnl.zoom.us/j/93651647483 \nMeeting ID: 936 5164 7483
URL:https://inpa.lbl.gov/event/virtual-inpa-seminar-matthew-ho-carnegie-mellon/
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20220121T120000
DTEND;TZID=America/Los_Angeles:20220121T130000
DTSTAMP:20260428T134339
CREATED:20220118T185520Z
LAST-MODIFIED:20220118T185520Z
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SUMMARY:VIRTUAL INPA SEMINAR | Lingyuan Ji (John Hopkins)
DESCRIPTION:Speaker: Lingyuan Ji (John Hopkins) \nTitle: Cosmological Neutrino Perturbations Without The Boltzmann Hierarchy  \nAbstract: \nWe present a formulation of cosmological perturbation theory where the Boltzmann hierarchies that evolve the neutrino phase-space distributions are replaced by integrals that can be evaluated easily with Fast Fourier transforms. The simultaneous evaluation of these integrals combined with the differential equations for the rest of the system (dark matter\, photons\, baryons) are then solved with an iterative scheme that converges quickly. The formulation is particularly powerful for massive neutrinos\, where the phase space is three-dimensional rather than two-dimensional\, and even more so for three different neutrino mass eigenstates. Therefore\, it has the potential to significantly speed up the computation times of cosmological perturbation calculations. This approach should also be applicable to models with other non-cold collisionless relics. \n\n\n\n\nJoin Zoom Meeting \nhttps://lbnl.zoom.us/j/94493465642 \nMeeting ID: 944 9346 5642
URL:https://inpa.lbl.gov/event/virtual-inpa-seminar-lingyuan-ji-john-hopkins/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20220128T120000
DTEND;TZID=America/Los_Angeles:20220128T130000
DTSTAMP:20260428T134339
CREATED:20220119T224655Z
LAST-MODIFIED:20220125T112145Z
UID:1143-1643371200-1643374800@inpa.lbl.gov
SUMMARY:VIRTUAL INPA SEMINAR | Julie Pagès (University of Zurich)
DESCRIPTION:Location: via Zoom \nSpeaker: Julie Pagès (University of Zurich) \nTitle: Different Flavors For Different Particles: Mass Hierarchies\, B Anomalies\, and Neutrinos  \nAbstract: \nDespite many advances in neutrino physics\, their masses are still not known and their mass generation remains mysterious. On the other hand\, quarks and charged leptons exhibit a very hierarchical mass spectrum which can be well described by an approximate U(2)5 flavor symmetry. Coincidently\, the B anomalies\, hinting at Lepton Flavor Universality Violation\, seem to require the same flavor structure of new interactions. The flavor non-universal Pati-Salam model establishes the connection explicitly by unifying quarks and leptons\, providing a combined explanation of the charged and neutral current B anomalies and\, at the same time\, of the mass hierarchies in the SM… except for the neutrinos\, which once again seem to defy the trend with their anarchic mass spectrum. In this talk\, I will discuss a resolution to this apparent problem through the Inverse Seesaw mechanism and briefly mention how a natural interpretation can be found in the context of extra-dimensions. Finally\, I will present the main signatures to expect from this neutrino extension. \n\n\nJoin Zoom Meeting \nhttps://lbnl.zoom.us/j/99536414141 \nMeeting ID: 995 3641 4141
URL:https://inpa.lbl.gov/event/virtual-inpa-seminar-julie-page-university-of-zurich/
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