All-sky analysis of astrochronometric signals induced by gravitational waves

Golat, Sebastian; Contaldi, C. R.

doi:10.1103/physrevd.105.063502

Cited by 2 publications

(4 citation statements)

References 39 publications

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“…The time-domain strain imposes a real condition, necessitating that h P (f, Ω) = h P (−f, Ω) * and ϵ P ij ( Ω) * = ϵ P ji ( Ω) for linear polarization basis P = +/×. The frequency-domain signals from PTAs and astrometry can be universally expressed as [36]:…”

Section: Jcap05(2024)030mentioning

confidence: 99%

“…Using these definitions, the correlations in eq. (2.6) can be simplified to the following expressions [19,21,30,36]:…”

Section: Jcap05(2024)030mentioning

confidence: 99%

“…Identifying circular polarization with astrometry. Astrometry holds the potential to explore circular polarization through EB correlation [21,30,36]. We estimate the resolution of the circular polarization fraction v k ≡ V k /I k , considering parameters on each frequency mode O k ≡ {I k , v k }.…”

Section: Astrometrymentioning

confidence: 99%

“…For instance, the Nancy Grace Roman Space Telescope (Roman), with its significantly higher observing cadence, can indeed extend the frequency range to above 10 −4 Hz [28,[33][34][35]. Moreover, the presence of parity-odd correlations among astrometric observables or PTA-astrometry cross-correlations can reveal the existence of a chiral component of SGWB [21,30,36]. Hence, it is imperative to explore in detail the prospects of astrometry.…”

Section: Introductionmentioning

confidence: 99%

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Dissecting the stochastic gravitational wave background with astrometry

Çalışkan,

Chen,

Dai

et al. 2024

J. Cosmol. Astropart. Phys.

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Astrometry, the precise measurement of star motions, offers an alternative avenue to investigate low-frequency gravitational waves through the spatial deflection of photons, complementing pulsar timing arrays reliant on timing residuals. Upcoming data from Gaia, Theia, and Roman can not only cross-check pulsar timing array findings but also explore the uncharted frequency range bridging pulsar timing arrays and LISA. We present an analytical framework to evaluate the feasibility of detecting a gravitational wave background, considering measurement noise and the intrinsic variability of the stochastic background. Furthermore, we highlight astrometry's crucial role in uncovering key properties of the gravitational wave background, such as spectral index and chirality, employing information-matrix analysis. Finally, we simulate the emergence of quadrupolar correlations, commonly referred to as the generalized Hellings-Downs curves.

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Section: Jcap05(2024)030mentioning

confidence: 99%

“…Using these definitions, the correlations in eq. (2.6) can be simplified to the following expressions [19,21,30,36]:…”

Section: Jcap05(2024)030mentioning

confidence: 99%

Section: Astrometrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dissecting the stochastic gravitational wave background with astrometry

Çalışkan,

Chen,

Dai

et al. 2024

J. Cosmol. Astropart. Phys.

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Constraining the stochastic gravitational wave background with photometric surveys

et al. 2022

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The detection of the Stochastic Gravitational Wave Background (SGWB) is essential for understanding black hole populations, especially for supermassive black hole binaries. The recent promising results from various Pulsar Timing Array (PTA) collaborations allude to an imminent detection. In this paper, we investigate the relative astrometric gravitational wave detection method, which can contribute to SGWB studies in the microhertz range. We consider the Roman Space Telescope and Gaia as candidates and quantitatively discuss the survey sensitivity in both the frequency and spatial domains. We emphasize the importance of survey specific constraints on performance estimates by considering mean field of view (FoV) signal subtraction and angular power spectrum binning. We conclude that if the SGWB is at a similar level as in PTA estimates, both Roman and Gaia have the potential to detect this frequency-domain power excess. However, both Roman and Gaia are subject to FoV limitations, and are unlikely to be sensitive to the spatial pattern of the SGWB.

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All-sky analysis of astrochronometric signals induced by gravitational waves

Cited by 2 publications

References 39 publications

Dissecting the stochastic gravitational wave background with astrometry

Dissecting the stochastic gravitational wave background with astrometry

Constraining the stochastic gravitational wave background with photometric surveys

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