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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:2
UID:UW-Physics-Event-8582
DTSTART:20240212T220000Z
DTEND:20240212T230000Z
DTSTAMP:20260413T223517Z
LAST-MODIFIED:20240206T021944Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Mapping New Physics from the UV to the IR\, Theory Seminar (Hi
 gh Energy/Cosmology)\, Grant Remmen\, NYU
DESCRIPTION:Using a combination of techniques spanning the modern ampl
 itudes program\, string theory\, effective field theory\, cosmology\, 
 and particle physics\, I will show how the space of possibilities for 
 new physics can be constrained—from both top-down and bottom-up pers
 pectives—in a variety of contexts\, ranging from quantum gravity\, t
 o predictions for colliders\, to cosmic inflation. <br>\n<br>\nIn the 
 first part of the talk\, we will ask a bedrock question of quantum gra
 vity: Is string theory unique? String amplitudes famously accomplish s
 everal extraordinary and interrelated mathematical feats\, including a
 n infinite spin tower\, tame UV behavior\, and dual resonance. I will 
 demonstrate that it is possible to construct infinite new classes of t
 ree-level\, dual resonant amplitudes with customizable\, nonlinear mas
 s spectra. The construction generalizes naturally to n-point scatterin
 g and allows for a worldsheet integral representation. However\, these
  constructions can be strongly constrained using multiparticle factori
 zation\, which provides a powerful new set of tools for building consi
 stent amplitudes. In the case of a Regge spectrum\, I will investigate
  whether string amplitudes can be bootstrapped from first principles\,
  finding extra freedom in the dynamics that allows for a new class of 
 dual resonant hypergeometric amplitudes.<br>\n<br>\nIn the second part
  of the talk\, I will take a particle physics-driven approach\, constr
 aining effective field theories using unitarity and causality. We will
  construct analytic dispersion relations for the effective field theor
 y of the standard model\, bounding the size and sign of higher-dimensi
 on operators\, with significant implications for CP and flavor violati
 on. These positivity bounds allow us to connect qualitatively differen
 t experiments\, including predictions for the LHC and precision measur
 ements. I will then apply these tools in a cosmological context\, buil
 ding positivity bounds for the theory of multifield inflation and extr
 acting predictions for non-Gaussianities in the cosmic microwave backg
 round. <br>\n<br>\nTaken together\, these two complementary initiative
 s comprise a program unifying phenomenological\, formal\, and cosmolog
 ical approaches to high energy physics\, bringing together powerful to
 ols bridging fields to map the possibilities of future physics.
URL:https://www.physics.wisc.edu/events/?id=8582
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