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- Michael J. Duff, Ramzi R. Khuri, Jianxin Lu
- 1994

We review the status of solitons in superstring theory, with a view to understanding the strong coupling regime. These solitonic solutions are non-singular field configurations which solve the empty-space low-energy field equations (generalized, whenever possible, to all orders in α′), carry a non-vanishing topological “magnetic” charge and are stabilized… (More)

Membrane/fivebrane duality in D = 11 implies Type IIA string/Type IIA fivebrane duality in D = 10, which in turn implies Type IIA string/heterotic string duality in D = 6. To test the conjecture, we reproduce the corrections to the 3-form field equations of the D = 10 Type IIA string (a mixture of tree-level and one-loop effects) starting from the… (More)

- Michael J. Duff, James T . Liu, J . Rahmfeld
- 1995

In six spacetime dimensions, the heterotic string is dual to a Type IIA string. On further toroidal compactification to four spacetime dimensions, the heterotic string acquires an SL(2, Z)S strong/weak coupling duality and an SL(2, Z)T × SL(2, Z)U target space duality acting on the dilaton/axion, complex Kahler form and the complex structure fields S, T, U… (More)

- Michael J. Duff
- 1996

Heterotic strings on R6 ×K3 generically appear to undergo some interesting new phase transition at that value of the string coupling for which the one of the six-dimensional gauge field kinetic energies changes sign. An exception is the E8 ×E8 string with equal instanton numbers in the two E8’s, which admits a heterotic/heterotic self-duality. In this… (More)

- Michael J. Duff
- 1996

We re-examine the question of heterotic heterotic string duality in six dimensions and argue that the E8 ×E8 heterotic string, compactified on K3 with equal instanton numbers in the two E8’s, has a self-duality that inverts the coupling, dualizes the antisymmetric tensor, acts non-trivially on the hypermultiplets, and exchanges gauge fields that can be seen… (More)

We present a class of black p-brane solutions of M-theory which were hitherto known only in the extremal supersymmetric limit, and calculate their macroscopic entropy and temperature. † Research supported in part by NSF Grant PHY-9411543 ‡ Research supported in part by DOE Grant DE-FG05-91-ER40633

- Michael J. Duff
- 1996

Superunification underwent a major paradigm shift in 1984 when eleven-dimensional supergravity was knocked off its pedastal by ten-dimensional superstrings. This last year has witnessed a new shift of equal proportions: perturbative ten-dimensional superstrings have in their turn been superseded by a new non-perturbative theory called M-theory, which… (More)

- Michael J. Duff
- 1995

The usual supermembrane solution ofD = 11 supergravity interpolates between R11 and AdS4× round S7, has symmetry P3×SO(8) and preserves 1/2 of the spacetime supersymmetries for either orientation of the round S7. Here we show that more general supermembrane solutions may be obtained by replacing the round S7 by any seven-dimensional Einstein space M7. These… (More)

- Michael J. Duff
- 2006

The four-dimensional N = 2 STU model of string compactification is invariant under an SL(2, Z)S × SL(2, Z)T × SL(2, Z)U duality acting on the dilaton/axion S, complex Kahler form T and the complex structure fields U , and also under a string/string/string triality S ↔ T ↔ U . The model admits an extremal black hole solution with four electric and four… (More)

- Michael J. Duff
- 1999

In the light of the duality between physics in the bulk of anti-de Sitter space and a conformal field theory on the boundary, we review the M2, D3 and M5 branes and how their near-horizon geometry yields the compactification of D = 11 supergravity on S7, Type IIB supergravity on S5 and D = 11 supergravity on S4, respectively. We discuss the “Membrane at the… (More)