From strings in 6d to strings in 5d

5D Black Holes and Matrix Strings

We derive the world-volume theory, the (non)-extremal entropy and background geometry of black holes and black strings constructed out of the NS IIA fivebrane within the framework of matrix theory. The CFT description of strings propagating in the black hole geometry arises as an effective field theory.

From Strings to Trees to Strings to Trees ... (Abstract)

A certain amount of structure is necessary simply because a clause may embed another clause, or one clause may attach to another clause or parts of it. Leaving this need of structure aside, the question then is how much structure should a (minimal) clause have? Grammar formalisms can differ significantly on this issue. Minimal clauses can be just strings, or words linked by dependencies (depend...

The Delta Operation: From Strings to Trees to Strings

From Strings to Membranes

We examine the extent to which the action for the membrane of M-theory (the elevendimensional construct which underlies and unifies all of the known string theories) simplifies in the so-called Open Membrane (OM) limit, a limit which lies at the root of the various manifestations of noncommutativity in the string context. In order for the discussion to be relatively self-contained, we start out...

From Quarks to Strings

In this article, prepared for the book ”The birth of string theory”, I recall the sequence of ideas which led to non-critical strings and gauge/strings duality. I also comment on some promising future directions.