Speaker: Kevin Zhou
Title:The Cavity Shift of Electron g-2
Room: 3024
Host: John Terning
Abstract: The electron magnetic moment is the most precisely measured property of any fundamental particle. Though its value in free space has been calculated very precisely, in practice the electron is trapped within a conducting cavity, which modifies the mode structure of the electromagnetic field. Classical arguments indicate that the shift is small, but relevant for the leading measurements. In quantum electrodynamics, the "cavity shift" is divergent, but standard renormalization techniques are inapplicable as the cavity breaks all symmetries. I will show a new calculation method which yields the cavity shift for spherical and cylindrical cavities. Time permitting, I will also discuss the subtleties of calculating g-2 in the presence of background fields, such as those of ultralight dark matter.
User:
High-Energy Seminars
Time:
4:00pm - 5:00pm
Location:
PHY 285
Send Reminder:
Yes - 7 days 0 hour 0 minutes before start
Description:
Speaker: Ryan Gibbons (UCB)
Title: Axion dark matter and neutrino detection with qubits
Room: 285
Host: Matthew Citron
Abstract: Detecting THz axion dark matter and low-energy coherent elastic neutrino-nucleon scattering (CEvNS) requires measuring meV energy depositions. Qubit-based sensors, such as Superconducting QUasiparticle-Amplifying Transmons (SQUATs), have the unique potential to robustly detect such small energies. In this talk, I will discuss the instrumentation of SQUAT sensors and their potential for discovery of new physics.
User:
High-Energy Seminars
Time:
1:30pm - 3:00pm
Description:
Speaker:
Title:
Room: 3024
Host:
Abstract:
Description:
Veterans Day
User:
High-Energy Seminars
Time:
1:30pm - 3:00pm
Description:
Speaker: David E. Kaplan
Title: Shadow Matter
Room: 3024
Host: John Terning
Abstract:
I will review how one gets classical physics from quantum theories in the Hamiltonian formulation, and then will show that there are quantum states of the field theories of general relativity and electromagnetism that we typically ignore, but have interesting phenomenological effects. These states amount to loosening the constraint equations in GR and EM. Doing so in GR removes the ‘problem of time’. It also generally sources non-dynamical parts of the metric which mimic a pressure-less dust, with some odd features, and thus these effects may be the explanation as to why we think there is dark matter. The constraint in EM is Gauss’ Law, and turning it off mimics a charge density that does not respond to electric forces, but follows geodesics. I will briefly discuss the cosmological consequences of these new fields and potential studies. I will also discuss some consequences of applying this formulation of gauge theories to non-Abelian groups.
Election Day