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  Simulation of the white dwarf-white dwarf galactic background in the LISA data

Edlund, J. A., Tinto, M., Krolak, A., & Nelemans, G. (2005). Simulation of the white dwarf-white dwarf galactic background in the LISA data. Classical and Quantum Gravity, 22(18 Sp. Iss. Sp. Iss. SI), S913-S926.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-4DDB-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-4DDC-8
Genre: Journal Article

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cqg5_18_s05.pdf (Publisher version), 399KB
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 Creators:
Edlund, J. A.1, Author
Tinto, M., Author
Krolak, Andrzej2, Author              
Nelemans, G., Author
Affiliations:
1External Organizations, ou_persistent13              
2Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24011              

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 Abstract: Laser Interferometer Space Antenna (LISA) is a proposed mission to detect and study gravitational radiation in the frequency range from 10-4 to 10-1 Hz. In the low part of its frequency band, the LISA data will contain a stochastic signal consisting of an incoherent superposition of hundreds of millions of gravitational wave signals radiated by inspiraling white-dwarf binaries present in our own galaxy. In order to estimate the LISA response to this background, we have simulated a population of white-dwarf binaries recently synthesized by one of us. Our approach relies on an analytic expressions of the LISA Time-Delay Interferometric responses to the gravitational radiation emitted by such systems, and it allows us to implement a computationally efficient and accurate simulation of the background in the LISA data. We find the amplitude of the galactic white-dwarf binary background in the LISA data to be modulated in time with a period of 1 year, reaching a minimum equal to about twice that of the LISA noise for a period of about 2 months around the time when the Sun–LISA direction is roughly oriented towards the Autumn equinox. This modulation means that the galactic white-dwarf background that will be observable by LISA is a cyclostationary random process with a period of 1 year. We summarize the theory of cyclostationary random processes and present the corresponding generalized spectral method needed to characterize such a process in the LISA data. We find that, by measuring the generalized spectral components of the white-dwarf background, LISA will be able to infer properties of the distribution of the white-dwarf binary systems present in our galaxy.

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Language(s): eng - English
 Dates: 2005-09-21
 Publication Status: Published in print
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 Identifiers: eDoc: 251024
ISI: 000232325800006
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Title: Classical and Quantum Gravity
  Alternative Title : Class. Quantum Gravity
Source Genre: Journal
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Pages: - Volume / Issue: 22 (18 Sp. Iss. Sp. Iss. SI) Sequence Number: - Start / End Page: S913 - S926 Identifier: ISSN: 0264-9381