DDF and Pohlmeyer invariants of (super)string

DDF and Pohlmeyer invariants of (super)string

We show how the Pohlmeyer invariants of the bosonic string are expressible in terms of DDF invariants. Quantization of the DDF observables in the usual way yields a consistent quantization of the algebra of Pohlmeyer invariants. Furthermore it becomes straightforward to generalize the Pohlmeyer invariants to the superstring as well as to all backgrounds which allow a free field realization of t...

Super-Pohlmeyer invariants and boundary states for non-abelian gauge fields

Aspects of the supersymmetric extension of the Pohlmeyer invariants are studied, and their relation to superstring boundary states for non-abelian gauge fields is discussed. We show that acting with a super-Pohlmeyer invariant with respect to some non-abelian gauge field A on the boundary state of a bare D9 brane produces the boundary state describing that non-abelian background gauge field on ...

Chapter 7 . DDF Domain

The dynamic dataflow (DDF) domain in Ptolemy is a superset of the synchronous dataflow (SDF) and Boolean dataflow (BDF) domains. In the SDF domain, a star consumes and produces a fixed number of particles per invocation (or “firing”). This static information (the number of particles produced or consumed for each star) makes possible compile-time scheduling. In the BDF domain, some actors with d...

Measuring DDF capacity and performance

The DDF (Distributed Data Facility) environment provides the capability for remote access to large DB2 databases by many remote application servers. While much of the application activity occurs outside the zseries complex, there are many measurements that can be used to understand not only the internal but also the remote activity that drives performance and capacity. This paper will explore t...

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