49 citations · 157 across the 6 of their papers we have counts for
6 papers · 1 filter
On the Topology of Black Hole Event Horizons in Higher Dimensions
C. Helfgott, Y. Oz, Y. Yanay
In four dimensions the topology of the event horizon of an asymptotically flat stationary black hole is uniquely determined to be the two-sphere . We consider the topology of…
E10 Orbifolds
Jeffrey Brown, Surya Ganguli, Ori J. Ganor +1
We study Z2 orbifolds of M-theory in terms of E10. We find a simple relation between the Z2 action on E10 and the imaginary root that corresponds [hep-th/0401053] to the "twisted s…
The General Twisted Open WZW String
M. B. Halpern, C. Helfgott
We recently studied two large but disjoint classes of twisted open WZW strings: the open-string sectors of the WZW orientation orbifolds and the so-called basic class of twisted op…
A Basic Class of Twisted Open WZW Strings
M. B. Halpern, C. Helfgott
Recently, Giusto and Halpern reported the open-string description of a certain basic class of untwisted open WZW strings, including their associated non-commutative geometry and op…
M-theory and E10: Billiards, Branes, and Imaginary Roots
Jeffrey Brown, Ori J. Ganor, Craig Helfgott
Eleven dimensional supergravity compactified on admits classical solutions describing what is known as billiard cosmology - a dynamics expressible as an abstract (billiard…
The Outer-Automorphic WZW Orbifolds on so(2n), including Five Triality Orbifolds on so(8)
O. Ganor, M. B. Halpern, C. Helfgott +1
Following recent advances in the local theory of current-algebraic orbifolds we present the basic dynamics - including the {\it twisted KZ equations} - of each twisted sector of al…