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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-3448
DTSTART:20141104T210000Z
DTEND:20141104T220000Z
DTSTAMP:20260416T145047Z
LAST-MODIFIED:20141031T222508Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Stueckelberg U(1)'s and Axions in String Theory\, Theory Semin
 ar (High Energy/Cosmology)\, Fang Ye\, University of Wisconsin-Madison
DESCRIPTION:In this talk\, we will discuss several interesting scenari
 os in which U(1) gauge fields couple to axions through the Stueckelber
 g mechanism from a string theory perspective. We will first introduce 
 the milli-charged dark matter scenario in which a small electric charg
 e carried by the dark matter particles arise exclusively through kinet
 ic mixing of the photon with some extra massless U(1)'s. We discuss ho
 w this apparent contradiction with the "folk theorem" of quantum gravi
 ty (that forbids the existence of non-quantized charges) can be resolv
 ed when embedded in string theory. Then we will discuss a related scen
 ario - "Stueckelberg Portal" - in which the sizable interactions betwe
 en Standard Model (SM) and the hidden sectors through heavy Z' bosons 
 arise from a large U(1) mass mixing induced by the Stueckelberg mechan
 ism. Such models present many interesting phenomenological features (e
 .g. SUSY mediation\, hidden valley\, no chiral exotics\, etc)\, and ar
 e simple and generic in top-down models. We will see how the Stueckelb
 erg Portal can naturally be implemented in string theory. An explicit 
 intersecting D-brane model will be presented. Finally\, we will briefl
 y mention some ongoing work on realizing super-Planckian axion decay c
 onstants in string theory.
URL:https://www.physics.wisc.edu/events/?id=3448
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