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AN INTRODUCTION TO TWISTOR THEORY
MASSLESS FIELDS AND SHEAF C0H0M0L0GY
CURVED TWIST0R SPACES
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0xford a-plane algebra analytic functions angular momentum baryon binor boundary coboundary cocycle cohomology group complex manifold construction contour integral contour integral formula coordinates corresponding curved twistor space defined deformed denote diquarks element of H elementary exact sequence f(Za field equations Figure follows geometry given global graviton H PT hadron helicity holomorphic functions homogeneous of degree homology Hughston hypersurface indices intersection isomorphism line bundle linear massless fields mesons Minkowski space multiplets n-twistor neighbourhood null geodesics obtain operator particle Penrose photon Phys polynomials projective twistor space quadric quantum numbers quark model region represented resonances satisfies scalar self-dual Serre duality sheaf cohomology sheaf of germs sheaves singular space PT space-time point spin spinor coefficient structure Stein symmetric tensor theorem transformation twisted cubic twistor diagrams twistor function twistor space twistor theory values vanishes vector bundle zero rest mass