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X-WR-CALNAME:Department of Physics and Astronomy
X-ORIGINAL-URL:https://physics.sciences.ncsu.edu
X-WR-CALDESC:Events for Department of Physics and Astronomy
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200808T080000
DTEND;TZID=America/New_York:20200808T170000
DTSTAMP:20260415T211811
CREATED:20200220T151850Z
LAST-MODIFIED:20200409T132425Z
UID:14518-1596873600-1596906000@physics.sciences.ncsu.edu
SUMMARY:Postponed - Annual LEAP! outreach event
DESCRIPTION:
URL:https://physics.sciences.ncsu.edu/event/annual-leap-outreach-event/
LOCATION:NC
CATEGORIES:For the Public
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200817T160000
DTEND;TZID=America/New_York:20200817T170000
DTSTAMP:20260415T211811
CREATED:20200805T213200Z
LAST-MODIFIED:20200812T124758Z
UID:17121-1597680000-1597683600@physics.sciences.ncsu.edu
SUMMARY:Special Physics Colloquium: Evan Grohs (Michigan University)
DESCRIPTION:Title: Precision neutrino and nuclear physics in the early universe \nAbstract: The next generation of cosmic observatories will provide 1% precision on parameters and observables.  With such levels of precisions\, cosmologists will have the best opportunity to verify the standard models of particle physics and cosmology\, or perhaps reveal new physics beyond those models.  In this talk\, I will discuss my past research on characterizing the neutrino and nuclear sectors during big bang nucleosynthesis.  At high temperature\, the neutrinos and electromagnetic plasma maintain equilibrium with one another.  The neutrinos and charged leptons decouple at lower temperatures which results in an order 1% larger neutrino energy density than expected from equilibrium considerations.  Concurrently\, the light nuclides evolve analogously\, beginning in nuclear statistical equilibrium and eventually obtaining the primordial abundance freeze-out values.  Within the standard model\, I will discuss how to predict the neutrino parameters and primordial abundances.  With an understanding of the predictions from the standard cosmology\, we can begin to characterize signals from beyond standard model physics.  I will conclude with a description of some future work beyond the standard model. \nHost: Gail McLaughlin
URL:https://physics.sciences.ncsu.edu/event/physics-colloquiumevan-grohs-michigan-university/
LOCATION:NC
CATEGORIES:Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200824T160000
DTEND;TZID=America/New_York:20200824T170000
DTSTAMP:20260415T211811
CREATED:20200812T123511Z
LAST-MODIFIED:20200813T174653Z
UID:17145-1598284800-1598288400@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium: Introduction of New Grad Students
DESCRIPTION:Co-Host: Dr. Aspnes
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-introduction-of-new-grad-students/
LOCATION:NC
CATEGORIES:Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200826T160000
DTEND;TZID=America/New_York:20200826T170000
DTSTAMP:20260415T211811
CREATED:20200708T194157Z
LAST-MODIFIED:20200826T184158Z
UID:17028-1598457600-1598461200@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium:
DESCRIPTION:Title: Neutrinos in and from Supernovae \nAbstract: \nNinety-nine percent of the energy released in a core-collapse supernova is emitted in the form of neutrinos. Due to their central role in the supernova paradigm\, our understanding of these stellar explosions ultimately rests upon our understanding of one of nature’s most ephemeral particles. The phenomena of neutrino flavor oscillations changes one type of neutrino into the others as the neutrino propagates however at the present time\, even the most sophisticated\, multi-dimensional simulations of core-collapse supernovae do not (self-consistently) include neutrino flavor transformation. The present state-of-the-art\, known as the BULB model\, post-processes a simulation thus any flavor transformation cannot be fed back into the dynamics of the explosion. If the dynamics are changed\, the signal we receive from the next supernova in the Milky Way will also be changed. \nIn this talk I will present the main thrusts of the research undertaken by the group at NC State into supernova neutrinos: going beyond the BULB model\, and neutrino signals from supernovae. I will present the first hydrodynamic core-collapse supernova simulation which simultaneously includes flavor transformation of the free-streaming neutrinos in the neutrino transport. The oscillation calculations are dynamically updated and evolve self-consistently alongside the hydrodynamics. Using a 20 Msun progenitor\, I will quantify the changes to the neutrino emission and the heating rates and show that flavor transformation alone does not lead to a successful explosion of this progenitor in spherical symmetry. I will then move on to neutrino signals and demonstrate the newly completed SNEWPY software package written for the SNEWS 2.0 collaboration. With this software we are able to connect many hundreds of simulations with the signals they produce in neutrino detectors on Earth allowing for a quantum leap in the quality of studies examining the physics sensitivity of future Galactic supernova observations. \nHost: Department of Physics
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-jim-kneller/
LOCATION:NC
CATEGORIES:Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200831T160000
DTEND;TZID=America/New_York:20200831T170000
DTSTAMP:20260415T211811
CREATED:20200708T194251Z
LAST-MODIFIED:20200831T201337Z
UID:17023-1598889600-1598893200@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium: Chen-Yu Liu
DESCRIPTION:Indiana University \nTitle: Measuring the Neutron Lifetime: Much Ado About Nothing? \nAbstract: Neutrons are stable inside atomic nuclei.  Outside the nucleus\, they decay into a proton\, electron\, and antineutrino\, with a lifetime of about 880 s.  The rate of decay can be calculated precisely\, using the theory of electroweak interactions\, with an uncertainty on the order of 1E-4.  The neutron decay rate sets the time scale of Big Bang Nucleosynthesis and determines the cosmic abundance of light elements.  High-precision measurements of the neutron lifetime and decay asymmetries continue to test the Standard Model of particle physics and to probe for new physics beyond.  Recent measurements using bottled neutrons have achieved lifetime uncertainties below 1 s (0.1%)\, but measurements using beam neutrons decaying in flight disagree by 10 s.  This discrepancy has motivated much experimental effort as well as exotic theoretical conjectures\, thus far without definite conclusions.  In this colloquium\, I will describe the challenges of precision neutron lifetime measurements\, and illustrate with details from the UCNtau experiment which has yielded the most precise such measurement to date. \nHost: Albert Young
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-chen-yu-liu-indiana-university/
LOCATION:NC
CATEGORIES:College of Sciences Calendar,Colloquia
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