Current work
Searching for gravitational-wave signals from inspiraling binaries of black holes and neutron stars
These systems embody the two-body problem of general relativity, and they will provide many exciting opportunities to study the nonlinear behavior of strong gravity and the structure of black holes and neutron stars, with both ground-based interferometers (such as LIGO), and with space-based detectors (such as LISA).
Improving the correctness of gravitational-wave data-analysis results
``Physics is a science based on error (analysis).'' Indeed, the most prized gravitational-wave observations will be those that can deliver accurate measurements of the parameters of astrophysical sources. Working out this accuracy in advance of the actual observations, however, is a tricky endeavor. In this research I map the pitfalls and trace a roadmap for... accurate accuracy estimations.
The Mock LISA Data Challenges
While actual LISA observations are still years away, it is important to pursue the development of its data analysis now, to inform mission design and to ensure that the LISA science objectives can be achieved. A crucial ingredient in this effort are the Mock LISA Data Challenges (MLDCs), an international program to generate and analyze synthetic LISA datasets. I am co-chair of the MLDC taskforce, and this work has been an important focus of mine since early 2006.
Understanding and improving the LISA measurement concept
The sensitivity of LISA to gravitational waves relies on Time Delay Interferometry (TDI), a clever technique used to combine the laser phase measurements taken on each LISA spacecraft into laser-noise-free observables. Understanding the mathematical structure of TDI makes it possible to devise improvements of the LISA measurement scheme that improve the LISA sensitivity and reduce its cost and risk.
Synthetic LISA: simulating the LISA noise and GW responses
Synthetic LISA is my high-fidelity software simulator of the LISA response to instrument noise and gravitational waves. It is used at JPL to characterize the LISA measurement process, and in many research groups around the world to develop and exercise data-analysis algorithm. It is also a crucial tool in the Mock LISA Data Challenges.
Outreach: for ground-based and space-based gravitational-wave detection efforts
My efforts to popularize gravitational-wave science in the scientific community and with the general public include websites, lectures, and a multimedia concert that spans music and science.
Completed projects
- Tidal disruption of neutron stars. Constraining the equation of state of neutron stars by gravity-wave observations.
- Nonlinear evolution of r-modes in neutron stars. Simulating and characterizing a promising source of gravitational waves.
- Relativity and acceleration. Investigating the philosophical foundations of spacetime theories.