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Massive String Theories From M-Theory and F-Theory
C. M. Hull
The massive IIA string theory whose low energy limit is the massive supergravity theory constructed by Romans is obtained from M-theory compactified on a 2-torus bundle over a circ…
Duality and the Signature of Space-Time
C. M. Hull
Versions of M-theory are found in spacetime signatures (9,2) and (6,5), in addition to the usual M-theory in 10+1 dimensions, and these give rise to type IIA string theories in 10-…
Timelike T-Duality, de Sitter Space, Large Gauge Theories and Topological Field Theory
C. M. Hull
T-Duality on a timelike circle does not interchange IIA and IIB string theories, but takes the IIA theory to a type theory and the IIB theory to a type theory. The…
Decoupling Limits in M-Theory
C. M. Hull
Limits of a system of N Dn-branes in which the bulk and string degrees of freedom decouple to leave a `matter' theory are investigated and, for n>4, either give a free theory or re…
Duality and Moduli Spaces for Time-Like Reductions
C. M. Hull, B. Julia
We consider the dimensional reduction/compactification of supergravity, string and M-theories on tori with one time-like circle. We find the coset spaces in which the massless scal…
Geometric Actions for D-Branes and M-Branes
M. Abou Zeid, C. M. Hull
New forms of Born-Infeld, D-brane and M theory five-brane actions are found which are quadratic in the abelian field strength. The gauge fields couple both to a background or induc…