Fully Data‐Driven Time‐Delay Interferometry with Time‐Varying Delays

Autor: Quentin Baghi, John G. Baker, Jacob Slutsky, James Ira Thorpe
Přispěvatelé: Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
Rok vydání: 2023
Předmět:
Zdroj: Annalen der Physik. :2200447
ISSN: 1521-3889
0003-3804
DOI: 10.1002/andp.202200447
Popis: Raw space-based gravitational-wave data like LISA's phase measurements are dominated by laser frequency noise. The standard technique to make this data usable for science is time-delay interferometry (TDI), which cancels laser noise terms by forming suitable combinations of delayed measurements. We recently introduced the basic concepts of an alternative approach which, unlike TDI, does not rely on independent knowledge of temporal correlations in the dominant noise. Instead, our automated Principal Component Interferometry (aPCI) processing only assumes that one can produce some linear combinations of the temporally nearby regularly spaced phase measurements, which cancel the laser noise. Then we let the data reveal those combinations. Our previous work relies on the simplifying additional assumption that the filters which lead to the laser-noise-free data streams are time-independent. In LISA, however, these filters will vary as the constellation armlengths evolve. Here, we discuss a generalization of the basic aPCI concept compatible with data dominated by a still unmodeled but slowly varying noise covariance. Despite its independence on any model, aPCI successfully mitigates laser frequency noise below the other noises' level, and its sensitivity to gravitational waves is the same as the state-of-the-art second-generation TDI, up to a 2\% error.
Comment: 12 pages, 7 figures. Update Eqs. (1) and (2) to generalize them to all possible TDI combinations. Other minor changes
Databáze: OpenAIRE
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