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GR: Fachverband Gravitation und Relativitätstheorie

GR 2: Gravitationswellen I

GR 2.8: Vortrag

Montag, 25. Februar 2013, 18:15–18:30, HS 6

Time-Delay Interferometry for a flexing LISA constellation — •Markus Otto, Andreas Schreiber, Gerhard Heinzel, and Karsten Danzmann — Max-Planck-Institut für Gravitationsphysik, Callinstraße 38, 30167 Hannover

Laser phase noise is the dominant noise source in the on-board measurements of the space-based gravitational wave detector LISA. A well-known data analysis technique, so-called "Time-Delay Interferometry" (TDI), provides synthesized data streams free of laser phase noise. At the same time TDI also removes the next largest noise source: phase fluctuations of the on-board clocks which distort the sampling process. Therefore TDI needs precise information about the spacecraft separations, sampling times and differential clock noises between the three spacecrafts. These are measured using auxiliary modulations on the laser light. Hence, there is a need for algorithms that account for clock noise removal schemes combined with TDI while preserving the gravitational wave signal.
In this talk, we will present the mathematical formulation of the LISA-like data streams and discuss a compliant TDI-algorithm that corrects for both clock and laser noise in the case of a rotating and flexing LISA constellation.