5 papers
Extended Supergravity Needs String Scale Cut-off
Ashoke Sen
Many string compactifications down to four non-compact space-time dimensions with N=8, N=6 and N=4 supersymmetry have BPS black holes carrying pure D-brane charges and preserving f…
How to Expose a Black Hole
Ashoke Sen
According to the correspondence principle of Horowitz and Polchinski, many black holes in string theory are continuously deformed to usual quantum systems involving D-branes and fu…
Decorating Asymptotically Flat Space-Time with the Moduli Space of String Theory
Ashoke Sen
N=2, 4 and 8 supersymmetric string theories in four dimensional flat space-time have moduli space of vacua. We argue that starting from a theory where the moduli approach a particu…
How to Create a Flat Ten or Eleven Dimensional Space-time in the Interior of an Asymptotically Flat Four Dimensional String Theory
Ashoke Sen
By taking large mass and charge limit of a black hole in string theory we can create arbitrarily large regions where the space-time is approximately flat, but the moduli fields tak…
Are Moduli Vacuum Expectation Values or Parameters?
Ashoke Sen
Banks has argued that the moduli of string theory are not vacuum expectation values but parameters. We offer a different perspective on this question. Given two different points P…