945 research outputs found
To see Symmetry in a Forest of Trees
The exact symmetry identities among four-point tree-level amplitudes of
bosonic open string theory as derived by G. W. Moore are re-examined. The main
focuses of this work are: (1) Explicit construction of kinematic configurations
and a new polarization basis for the scattering processes. These setups
simplify greatly the functional forms of the exact symmetry identities, and
help us to extract easily high-energy limits of stringy amplitudes appearing in
the exact identities. (2) Connection and comparison between D. J. Gross's
high-energy stringy symmetry and the exact symmetry identities as derived by G.
W. Moore. (3) Observation of symmetry patterns of stringy amplitudes with
respect to the order of energy dependence in scattering amplitudes.Comment: 56 pages; v2. Typos corrected. Minor changes; v3. Reorganized the
structure and eliminate verbose expressions. References added. Added words of
introduction to each section; v4. Reorganized and streamlined significantly.
Version to appear in Nucl.Phys.
Quasinormal Modes of Kerr Black Holes in Four and Higher Dimensions
We analytically calculate to leading order the asymptotic form of quasinormal
frequencies of Kerr black holes in four, five and seven dimensions. All the
relevant quantities can be explicitly expressed in terms of elliptical
integrals. In four dimensions, we confirm the results obtained by Keshest and
Hod by comparing the analytic results to the numerical ones.Comment: 14 pages, 7 figure
Supersymmetric reduced models with a symmetry based on Filippov algebra
Generalizations of the reduced model of super Yang-Mills theory obtained by
replacing the Lie algebra structure to Filippov -algebra structures are
studied. Conditions for the reduced model actions to be supersymmetric are
examined. These models are related with what we call \{cal N}_{min}=2 super
-brane actions.Comment: v3: In the previous versions we overlooked that Eq.(3.9) holds more
generally, and missed some supersymmetric actions. Those are now included and
modifications including a slight change in the title were made accordingly.
1+18 page
- …