Events at Physics |
Events During the Week of December 12th through December 19th, 2021
Monday, December 13th, 2021
- No events scheduled
Tuesday, December 14th, 2021
- No events scheduled
Wednesday, December 15th, 2021
- Academic Calendar
- Last class day
- Abstract: *Note: actual end time may vary.*
- Theory Seminar (High Energy/Cosmology)
- The Large Scale Structure of α' Effects in String Theory
- Time: 1:00 pm - 2:00 pm
- Place: Chamberlin 5280
- Speaker: Andreas Schachner, University of Cambridge
- Abstract: In this talk, I discuss three approaches to deriving and understanding α' effects in String Theory. I present preliminary results of a project on completing the ten-dimensional type II effective actions at higher order in string perturbation theory. In this context, I provide concrete evidence at the level of five-point superstring amplitudes that the kinematics in the maximally U(1)-violating sector is obtained from standard superspace integrals over sixteen fermionic coordinates. This is in line with 11D superparticle amplitudes in M-theory compactified on 2-tori where the well-known modular forms required for SL(2,Z) invariance of type IIB arise from integrating out winding modes on the torus.
- Host: Lars Aalsma
Thursday, December 16th, 2021
- Academic Calendar
- Study day
- Abstract: *Note: actual end time may vary.*
- NPAC (Nuclear/Particle/Astro/Cosmo) Forum
- Multimessenger constraints on intergalactic magnetic fields
- Time: 2:30 pm - 3:30 pm
- Place:
- Speaker: Rafael Alves Batista, Universidad Autónoma de Madrid
- Abstract: The most traditional and promising way to probe intergalactic magnetic fields (IGMFs) is using gamma rays produced in electromagnetic cascades initiated by high-energy gamma rays in the intergalactic space. Because the charged component of the cascade is sensitive to intervening magnetic fields, it is possible to probe IGMFs by combining spectral, temporal, and angular information from distant sources of high-energy gamma rays such as blazars. High-energy cosmic rays, too, being charged, can provide insights into IGMFs, although this is more complicated given that their sources remain to be found. At the dawn of the multimessenger era, a third probe can be used to help us solve this puzzle: neutrinos. In this talk I will firstly motivate the quest for understanding cosmic magnetogenesis and review the status of studies of IGMFs with neutrinos, cosmic rays, and gamma rays. I will then describe a novel multimessenger strategy for probing IGMFs using combined gamma-ray and neutrino observations from flaring objects. Finally, I will present the first constraints on the coherence length of IGMFs obtained with this method.
- Host: Ke Fang
Friday, December 17th, 2021
- Academic Calendar
- Final exams
- Abstract: *Note: actual end time may vary.* December 17-23, 2021
Saturday, December 18th, 2021
- Academic Calendar
- Final exams
- Abstract: *Note: actual end time may vary.* December 17-23, 2021
Sunday, December 19th, 2021
- Academic Calendar
- Commencement
- Abstract: *Note: actual end time may vary.* URL:
- Academic Calendar
- Final exams
- Abstract: *Note: actual end time may vary.* December 17-23, 2021