Space-based Gravitational Wave Observatories

Gair, Jonathan R; Hewitson, Martin; Petiteau, Antoine; Mueller, Guido

doi:10.48550/arxiv.2201.10593

Cited by 2 publications

(3 citation statements)

References 208 publications

(316 reference statements)

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“…Here we adopt the all-sky averaged inclination factor 5/4 for the pattern functions [21]. Moreover, we use the latest sensitivity curve S D (f ) of LISA provided by [22,23] to calculate the ρ lens opt . To highlight the relative SNR differences between the lensed h lens and unlensed waveforms h T , we measure the mismatch (1 − M) between h lens and h T , where M, namely match, is defined by…”

mentioning

confidence: 99%

Amplitude modulation in binary gravitational lensing of gravitational waves

Qiu¹,

Wang²,

He³

2022

Preprint

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We investigate the detectability of gravitational waves (GWs) lensed by a system that consists of binary black holes as lenses using time-domain numerical simulations. The gravitational lensing potential of this system is no longer static but evolves with time. When GWs from the source pass through the binary lens, their amplitudes can be modulated, which is similar to the phenomenon of amplitude modulation (AM) in radio communication. We find that even the frequency of the binary lens itself is too low to be detected by the LISA detection band, the sidebands in the spectrum of the lensed GWs due to AM can still be within the sensitive range of the detection band. Moreover, we also calculate the relative differences of SNR (mismatch) between the lensed and unlensed GWs. We find that the mismatch can be as significant as 9.18%. Since mismatch does not depend on the amplitude of wavefrom, the differences between the binary lensed and unlensed waveforms are substantial. This provides a robust way to identify the lensing event for the LISA project in the future.

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confidence: 99%

Amplitude modulation in binary gravitational lensing of gravitational waves

Qiu¹,

Wang²,

He³

2022

Preprint

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“…These waves interact only weakly with matter and hence, travel through the Universe without distortion of the information they carry about their origins. For instance, insights into the Milky Way and galaxy formation, in general, can be obtained by analyzing measurements of GWs that are emitted by massive black holes or ultra-compact binaries [3][4][5][6][7].…”

mentioning

confidence: 99%

“…Further, LISA trails the Earth around the Sun while the spacecraft rotate around their barycenter. This orbital motion introduces amplitude, frequency, and phase modulations to the measured data which encodes relevant information about the gravitational wave source such as source location, orientation, and the orbital plane [6,20]. The full potential of the LISA measurements is to be exploited with data analysis algorithms that are capable of extracting individual signals from a data stream that contains an unknown number of overlapping signals [21,22].…”

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confidence: 99%

Tri-linear representations for the Laser Interferometer Space Antenna

Андерссон

Riegger

Ferraioli

et al. 2022

EPL

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The Laser Interferometer Space Antenna (LISA) is a space-borne observatory of gravitational waves to be launched by ESA and NASA in the 2030s. Interferometric measurements are made between three spacecraft orbiting the Sun. The measurements are dependent on the geometric information due to the relative locations between the spacecraft as well as the intrinsic parameters of the astrophysical objects that generate the gravitational waves. We show that the measurements of mildly chirping gravitational waves can be approximated by means of a tri-linear representation, where the geometric information about the location of the observed object as well as that of the spacecraft locations, are separated by different factors. We discuss that for low frequencies the relative approximation error is proportional to the square of the signal’s carrier frequency and illustrate this accuracy in numerical experiments. For the sake of illustration, we outline a simple algorithm for extracting parameters from the observed gravitational waves.

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Space-based Gravitational Wave Observatories

Cited by 2 publications

References 208 publications

Amplitude modulation in binary gravitational lensing of gravitational waves

Amplitude modulation in binary gravitational lensing of gravitational waves

Tri-linear representations for the Laser Interferometer Space Antenna

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