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14 papers · 1 filter
String Theory: a theory in search of an experiment
Howard J. Schnitzer
It is argued that string theory may pose new conceptual issues for the history and philosophy of science.
Multi-Frequency VSOP and VLBA Polarization Observations of 3C279 and 3C345
C. C. Cheung, D. H. Roberts, J. F. C. Wardle +2
This contribution presents preliminary results from coordinated polarization sensitive VSOP and VLBA imaging of the blazars 3C~279 and 3C~345 at multiple frequencies.
VSOP Observations of the EGRET Blazar 1633+382
C. C. Cheung, J. S. Ulvestad, W. T. Vestrand +1
Two high-resolution 5 GHz VSOP+VLBA images of the blazar 1633+382 reveal clear morphological change in both the bright inner east-west jet, and in the more diffuse structure furthe…
Virasoro action on Schur function expansions, skew Young tableaux and random walks
M. Adler, P. van Moerbeke
It is known that some matrix integrals over U(n) satisfy an sl(2,R)-algebra of Virasoro constraints. Acting with these Virasoro generators on 2-dimensional Schur function expansion…
Littlewood-Richardson rules for Grassmannians
Anders Skovsted Buch, Andrew Kresch, Harry Tamvakis
We give elementary and short proofs of the Littlewood-Richardson rules for type A Grassmannians and maximal isotropic Grassmannians, based on the corresponding Pieri rules.
Gromov-Witten invariants on Grassmannians
Anders Skovsted Buch, Andrew Kresch, Harry Tamvakis
We prove that any three-point genus zero Gromov-Witten invariant on a type A Grassmannian is equal to a classical intersection number on a two-step flag variety. We also give sympl…