1.1k citations · 12.5k across the 161 of their papers we have counts for
15 papers · 1 filter
TASI Lectures on Remnants from the String Landscape
James Halverson, Paul Langacker
Superstring theories are very promising theoretically, but the enormous landscape of string vacua and the (likely) very large underlying string scale imply that they may never be t…
Singlet Extensions of the MSSM in the Quiver Landscape
Mirjam Cvetič, James Halverson, Paul Langacker
We map out possible extensions of the MSSM in the context of type II string theory. We systematically investigate three-stack and four-stack quivers which realize the MSSM spectrum…
The Weinberg Operator and a Lower String Scale in Orientifold Compactifications
Mirjam Cvetič, James Halverson, Paul Langacker +1
We investigate the interplay between the string scale and phenomenological scales in orientifold compactifications. Specifically, we discuss in generality the tension that often ar…
D-Instanton Generated Dirac Neutrino Masses
Mirjam Cvetic, Paul Langacker
We present a stringy mechanism to generate Dirac neutrino masses by D-instantons in an experimentally relevant mass scale without fine-tuning. Within Type IIA string theory with in…
New Grand Unified Models with Intersecting D6-branes, Neutrino Masses, and Flipped SU(5)
Mirjam Cvetic, Paul Langacker
We construct new supersymmetric SU(5) Grand Unified Models based on Z4 x Z2 orientifolds with intersecting D6-branes. Unlike constructions based on Z2 x Z2 orientifolds, the orbifo…
Toward Realistic Intersecting D-Brane Models
Ralph Blumenhagen, Mirjam Cvetic, Paul Langacker +1
We provide a pedagogical introduction to a recently studied class of phenomenologically interesting string models, known as Intersecting D-Brane Models. The gauge fields of the Sta…