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Crossing Symmetric Dispersion Relations in Quantum Field Theories.
Phys Rev Lett
May 2021
Centre for High Energy Physics, Indian Institute of Science, C.V. Raman Avenue, Bangalore 560012, India.
For 2-2 scattering in quantum field theories, the usual fixed t dispersion relation exhibits only two-channel symmetry. This Letter considers a crossing symmetric dispersion relation, reviving certain old ideas from the 1970s. Rather than the fixed t dispersion relation, this needs a dispersion relation in a different variable z, which is related to the Mandelstam invariants s, t, u via a parametric cubic relation making the crossing symmetry in the complex z plane a geometric rotation.
View Article and Find Full Text PDFRotating black holes in dilatonic Einstein-Gauss-Bonnet theory.
Phys Rev Lett
April 2011
Institut für Physik, Universität Oldenburg, D-26111 Oldenburg, Germany.
We construct generalizations of the Kerr black holes by including higher-curvature corrections in the form of the Gauss-Bonnet density coupled to the dilaton. We show that the domain of existence of these Einstein-Gauss-Bonnet-dilaton (EGBD) black holes is bounded by the Kerr black holes, the critical EGBD black holes, and the singular extremal EGBD solutions. The angular momentum of the EGBD black holes can exceed the Kerr bound.
View Article and Find Full Text PDFGlobal charges of stationary non-Abelian black holes.
Phys Rev Lett
May 2003
Department of Mathematical Physics, University College, Dublin, Belfield, Dublin 4, Ireland.
We consider stationary axially symmetric black holes in SU(2) Einstein-Yang-Mills-dilaton theory. We present a mass formula for these stationary non-Abelian black holes, which also holds for Abelian black holes. The presence of the dilaton field allows for rotating black holes, which possess nontrivial electric and magnetic gauge fields, but do not carry a non-Abelian charge.
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