Concepts and status of Chinese space gravitational wave detection projects

Gong, Yungui; Luo, Jun; Wang, Bin

doi:10.48550/arxiv.2109.07442

Cited by 7 publications

(7 citation statements)

References 79 publications

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“…Other proposed third-generation observatories include LISA[30], DECIGO[31], TianQin and Taiji[32], which will all be space-based rather than terrestrial like the ET and CE, allowing for far longer interferometer arms than is possible on Earth. These instruments will hence be sensitive to a very different GW frequency range to that of ET and CE, which means that the latter will have far better prospects for detecting PBHs in the mass range 1-100 M .…”

mentioning

confidence: 99%

Dancing in the dark: detecting a population of distant primordial black holes

Martinelli,

Scarcella,

Hogg

et al. 2022

Preprint

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Primordial black holes (PBHs) are compact objects proposed to have formed in the early Universe from the collapse of small-scale over-densities. Their existence may be detected from the observation of gravitational waves (GWs) emitted by PBH mergers, if the signals can be distinguished from those produced by the merging of astrophysical black holes. In this work, we forecast the capability of the Einstein Telescope, a proposed third-generation GW observatory, to identify and measure the abundance of a subdominant population of distant PBHs, using the difference in the redshift evolution of the merger rate of the two populations as our discriminant. We carefully model the merger rates and generate realistic mock catalogues of the luminosity distances and errors that would be obtained from GW signals observed by the Einstein Telescope. We use two independent statistical methods to analyse the mock data, finding that, with our more powerful, likelihood-based method, PBH abundances as small as f PBH ≈ 7 × 10 −6 (f PBH ≈ 2 × 10 −6 ) would be distinguishable from f PBH = 0 at the level of 3σ with a one year (ten year) observing run of the Einstein Telescope. Our mock data generation code, darksirens, is fast, easily extendable and publicly available on GitLab ɭ.

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mentioning

confidence: 99%

Dancing in the dark: detecting a population of distant primordial black holes

Martinelli,

Scarcella,

Hogg

et al. 2022

Preprint

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“…[52]). Therefore, it is expected that, in the future more and more GW events with the source redshifts z > 1 will be detected by the next generation of ground-based GW detectors and the space-based GW detectors [53][54][55][56][57][58][59][60][61][62][63][64][65][66][67]. However, when the source redshift of a GW event goes larger, the time delay could be so long that the cosmological expansion is nonnegligible.…”

Section: B Prediction For a High-redshift Sourcementioning

confidence: 99%

Shortcut in codimension-2 brane cosmology in light of GW170817

Lin¹,

Yu²,

Liu³

2022

Preprint

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In this paper, our universe is regarded as a codimension-2 brane embedded in a noncompact six-dimensional Anti-de Sitter (AdS) spacetime. We derive the gravitational horizon radius on the brane under the low-energy approximation, which reflects how the extra dimensions cause the shortcut effect of gravitational waves (GWs). We also study the time delay between a GW signal and an electromagnetic (EM) wave signal in the low-redshift limit by combining with the joint observations of GW170817/GRB 170817A, which gives an upper limit to the AdS 6 radius as ℓ 2 3.84 Mpc 2 . For a high-redshift source, the time delay is converted into the discrepancy between the source redshift derived from the GW signal and the one derived from the EM counterpart. It is found that if one expects to detect the EM counterpart of a high-redshift GW event within a reasonable observation time, it requires a stronger constraint on the AdS 6 radius. Our research shows that the AdS 6 radius should satisfy ℓ 2 0.02 Mpc 2 for the DECIGO and BBO.

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“…These changes will also be reflected in the corresponding null geodesics around central black holes and lead to the deformed shadow of a black hole. With the successful photographing of the Black Hole Horizon [49][50][51][52][53][54] and the continuous advancement of the space-borne gravitational wave detectors [55][56][57][58][59][60][61][62], it has gradually become possible to observe the deviation of the black hole in the modified gravity theory.…”

Section: Introductionmentioning

confidence: 99%

Motion of spinning particles around electrically charged black hole in Eddington-inspired Born–Infeld gravity

Yang

Zhang

2022

Eur. Phys. J. C

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A test particle possessing spin angular momentum moves along a non-geodesic path due to an additional spin-curvature force. We study the spinning test particle moving in the vicinity of the electrically charged black hole formation in Eddington-inspired Born–Infeld (EiBI) gravity. Through the numerical analysis of its effective potential and orbits, it is found that the orbital eccentricity reduces as the deviation parameter $$\kappa $$ κ increases. By comparing the orbits for the observed stars around Sagittarius A*, we conclude that the observed orbits with too large radii can not give a stringent constraint with acceptable magnitude. To dig out the potential observation effects of the relations between the orbits and parameter $$\kappa $$ κ , we mainly focus on the orbits in the vicinity of black hole in this paper. The parameters of inner most stable circular orbit (ISCO) decrease monotonously with $$\kappa $$ κ when the spin angular momentum is small, however they change non-monotonously with $$\kappa $$ κ when the spin is large enough. Moreover, the spin dependences of ISCO parameters have similar behavior to that of Reissner–Nordström (RN) black hole. We analyze the causality of the circular orbits by using the superluminal constraint condition as well. As a result, two new parameter regions may emerge in case of large $$\kappa $$ κ , where the particle has two stable circular orbits with one subluminal and the other superluminal.

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Concepts and status of Chinese space gravitational wave detection projects

Cited by 7 publications

References 79 publications

Dancing in the dark: detecting a population of distant primordial black holes

Dancing in the dark: detecting a population of distant primordial black holes

Shortcut in codimension-2 brane cosmology in light of GW170817

Motion of spinning particles around electrically charged black hole in Eddington-inspired Born–Infeld gravity

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