Which institute is this Indian theoretical physicist who contributed to studies of S-branes a visiting professor at?
S-brane In string theory, an S-brane is a hypothetical and controversial counterpart of a D-brane, which, unlike a D-brane, is localized in time. Depending on the context the "S" stands for "Strominger", "Sen", or "Space-like". The S-brane was originally proposed by Andrew Strominger in his speculative paper with Michael Gutperle, and another version of S-branes was studied by Ashoke Sen. They are thought to be extended in the space-like/temporal directions only, so that they exist at only one point in time, but are otherwise analogous to p-branes.
Israr Ahmad Israr Ahmad (19 December 1940 – 2 April 2010) was an Indian theoretical nuclear physicist and professor at Aligarh Muslim University since 1961. He was known for his work in quantum scattering theory.