Gravitational Wave Group at IUCAA

In 1989 after I joined IUCAA, along with Sathyaprakash (Sathya in short) we began working in the field of data analysis of gravitational waves (Prior to this during 1987 - 1988 I had spent an year with Bernard Schutz where I was not only initiated into this area but also acquired some experience). Sathya contributed handsomely to the group activity and we were able to build a thriving group in gravitational wave data analysis. In the successful working of the group, the research students  have played a vital role.

Biplab Bhawal with his engineering background (but Ph.D. on a topic in general relativity) and Vijay Chickarmane with his inclination towards quantum optics, chaos etc. added extra dimensions to the activities and was greatly aided by David McClelland from ANU, Canberra, Australia. The Indo-French project with Orsay group of the VIRGO and interaction with Australia (see collaborations) helped us to branch out into another area - modelling of the interferometer. David Blair from  UWA, Perth, Australia played a key role in our collaboration with Australia.

In the all sky search for pulsars, D. C. Srivastava and his student Sanjay Sahay contributed independently and with great enthusiasm to the data analysis effort at IUCAA. This was the university component. In this work Ram Valluri from University of Western Ontario, Canada also joined in with several contributions.

In the year 2000 the IUCAA group joined the LSC where we worked on efficient search methods for inspiraling binaries, namely, the hierarchical search and the interpolated search which used Tchebyshev polynomials. Under the LSC we are currently part of the stochastic group and are involved in developing methods for mapping the gravitational wave stochastic background.  This map making is based on first making a directed search for a given patch in the sky and then gluing all the pieces together. 

With the Nice group under the IFCPAR programme we have contributed to the data analysis for LISA. Jean-Yves Vinet was my French collaborator. We found  a novel  approach based on commutative algebra  for doing time-delay interferometry for LISA. This was an elegant method for cancelling laser frequency noise. Follow up work on optimisation was carried out with  Rajesh Nayak and Archana Pai. We are now working on extending our previous work to  moving  LISA and the flexing of its arms. General relativistic corrections are a must. We have made a beginning by studying the dynamics of  the spacecraft and arm flexing. This work was also with Rajesh Nayak and Sucheta Koshti.

With the Japanese group Nobuyuki Kanda and Hideyuki Tagoshi we are working on comparing the coherent search versus the coincidence search for inspiraling binaries with a network of detectors. Himan is the IUCAA student involved in this project.   

I list below the research students in the chronological order as they joined me:

The students in orange are with me at IUCAA.

I list below the postdocs who worked with me: