Speaker: Raman Sundrum
Title: Cosmology and Unification
Room: 3024
Zoom: https://zoom.us/j/186024391
Host: Markus Luty
Abstract: I will review how future measurements of primordial Non-Gaussianities in the CMB, Large Scale Structure and 21-cm cosmology can probe very heavy particle physics at inflationary energy scales, by a mechanism known as “cosmological collider physics". Intuitively, the production of heavy particles is due to the “Hawking temperature” of inflationary spacetime, and their detection is via their decay into inflatons. Even greater mass reach is shown to be possible via “chemical potential” enhancement. These mechanisms are applied to plausible targets, namely our most ambitious gauge-Higgs and extra-dimensional theories, such as Orbifold Grand Unification, “dark” sectors, and the Standard Model itself, with particles as exotic as spin-2 Kaluza Klein gravitons. I will show how the Hierarchy “Problem" of the Standard Model may become an asset in this context, allowing it to be more readily probed during inflation via the mechanism of “Heavy-Lifting”.
Description:
Don't forget to vote!
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High-Energy Seminars
Time:
1:30pm - 3:00pm
Send Reminder:
Yes - 3 days 5 hour 0 minutes before start
Description:
Speaker: Francesco Riva
Title: Microscopic Bounds on Macroscopic Theories
Room: 3024
Zoom: https://zoom.us/j/186024391
Host: Markus Luty
Abstract: Effective Field Theories (EFTs) appear everywhere there is a mass scale. They serve to simplify complex multiscale problems, and as general tools to parametrise the unknown or incalculable (e.g. the pion chiral Lagrangian, gravity, or physics beyond the standard model - BSM). I will present how dispersion relations (both forward and at finite impact parameter) single out EFTs that originate from microscopic unitary theories, both at weak and at strong coupling. This reshapes the landscape of plausible physics BSM, and I will show that theories with very irrelevant interactions, theories with isolated massive higher-spin particles, and massive gravity don’t posses healthy UV completions.
Description:
Veterans Day
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High-Energy Seminars
Time:
1:30pm - 3:00pm
Send Reminder:
Yes - 3 days 5 hour 0 minutes before start
Description:
Speaker: Yi Chung
Title: Connecting B anomalies with the hierarchy problem
Room: 3024
Zoom: https://zoom.us/j/186024391
Host: Luty
Abstract: Intriguing hints for lepton flavor universality violation have emerged from the measurement of B meson decays by LHCb. These B anomalies point to the new physics at the low TeV scale, exactly where we expect a solution to the hierarchy problem! In this talk, I will present an economical model that can address the two problems at once. The model is based on a SU(4)/SP(4) fundamental composite Higgs model. The hierarchy problem can be solved by the compositeness of the pNGB Higgs, and the observed B anomalies can be explained by the additional Z’ boson in the model. The model connects the energy scales of the EWSB and the B anomalies. I will discuss the experimental constraints from Higgs physics, flavor physics, and LHC direct searches.
Speaker: Michael Trott
Title: The Geometric SMEFT description of curved Higgs Field Space(s)
Room: 3024
Zoom: https://zoom.us/j/186024391
Host: Markus Luty
Abstract: In recent years, the effective field theory approach to the Standard Model, the SMEFT, has been used to study LHC data with ever increasing theoretical precision and sophistication. However, the complexity of this theory lead to several barriers to substantial theoretical progress. In particular, the explosion in the number of parameters in the SMEFT as a function of operator mass dimension, and the technical challenge or reformulating SM predictions consistently into the SMEFT were very serious problems, that called into question the possible success and value of the SMEFT physics program over the long term. I will discuss how these challenges have been overcome. The key point leading to this advance is the understanding that the projection of curved scalar field spaces generated by the Higgs onto a naive flat field space understanding implicitly embedded into the usual SMEFT Lagrangian and approach was the root cause of many problems, technical challenges and confusions. Many outstanding issues have now been addressed and immediately overcome by reformulating the SMEFT noting its curved scalar field space(s) - in the Geometric SMEFT. Some examples of the benefits of this approach will be presented, and explained.
