[Theory-seminars] Fw: Seminars next week

[Carlota Andres Casas]

Dear all,

Here is a a reminder of tomorrow's seminar:

Bluejeans connection: https://bluejeans.com/610445877

Theory seminar:
Monday, Sep 30, 1:00PM, Room L102
Casey Berger (North Carolina U.), "Rotating Superfluids via Complex Langevin''

Abstract:
Quantum field theories with a complex action suffer from a sign problem in stochastic nonperturbative treatments, making many systems of great interest - such as polarized or mass-imbalanced fermions and QCD at finite baryon density – extremely challenging to treat numerically. Another such system is that of bosons at finite angular momentum (or rotating superfluids). Experimentalists have successfully achieved vortex formation in supercooled bosonic atoms, and have measured quantities of interest such as the moment of inertia. However, rotating superfluids suffer from a numerical sign problem, making the usual numerical treatments of the theory unusable. In this work, we use complex stochastic quantization to calculate basic properties of rotating superfluids



________________________________
From: Theory-seminars <theory-seminars-bounces at jlab.org> on behalf of Carlota Andres Casas <carlota at jlab.org>
Sent: Friday, September 27, 2019 4:41 PM
To: theory-seminars at jlab.org <theory-seminars at jlab.org>
Subject: [Theory-seminars] Seminars next week

Dear all,

Here is a reminder for the seminars next week:

Theory seminar:
Monday, Sep 30, 1:00PM, Room L102
Casey Berger (North Carolina U.), "Rotating Superfluids via Complex Langevin''

Abstract:
Quantum field theories with a complex action suffer from a sign problem in stochastic nonperturbative treatments, making many systems of great interest - such as polarized or mass-imbalanced fermions and QCD at finite baryon density – extremely challenging to treat numerically. Another such system is that of bosons at finite angular momentum (or rotating superfluids). Experimentalists have successfully achieved vortex formation in supercooled bosonic atoms, and have measured quantities of interest such as the moment of inertia. However, rotating superfluids suffer from a numerical sign problem, making the usual numerical treatments of the theory unusable. In this work, we use complex stochastic quantization to calculate basic properties of rotating superfluids.

Cake seminar:
Wednesday Oct 2, 1:00PM, Room L102
Lubomir Pentchev (JLab), "Probing proton gluonic structure with J/psi exclusive photoproduction''

Abstract:
Recently GlueX published first measurements of near-threshold J/psi exclusive photoproduction. The heavy charmonium interacts with the light quarks of the proton (that near threshold carry significant fraction of the proton momentum) predominantly via hard gluon exchange. The purpose of the presentation will be to discuss the possibilities of using the measured cross-sections to study the gluonic distributions in the proton at high x. The GlueX detector will be described briefly and the main experimental results will be presented. Theoretical works that describe the J/psi cross-section and relate it to the gluonic distributions will be discussed. The production of the LHCb pentaquarks, predicted for the s-channel of the reaction, will not be part of this talk.

Bluejeans connection: https://bluejeans.com/610445877

--

Raza, Miguel, Carlota
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