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Constraining the time variation of Newton's constant G with gravitational-wave standard sirens and supernovae.

Zhao, Wen and Wright, Bill S. and Li, Baojiu (2018) 'Constraining the time variation of Newton's constant G with gravitational-wave standard sirens and supernovae.', Journal of cosmology and astroparticle physics., 2018 (10). 052.


The intrinsic peak luminosity of Type Ia supernovae (SNIa) depends on the value of Newton's gravitational constant G, through the Chandrasekhar mass MCh∝ G−3/2. If the luminosity distance can be independently determined, the SNIa can be treated as a tracker to constrain the possible time variation of G in different redshift ranges. The gravitational-wave (GW) standard sirens, caused by the coalescence of binary neutron stars, provide a model-independent way to measure the distance of GW events, which can be used to determine the luminosity distances of SNIa by interpolation, provided the GW and SNIa samples have similar redshift ranges. We demonstrate that combining the GW observations of third-generation detectors with SNIa data provides a powerful and model-independent way to measure G in a wide redshift range, which can constrain the ratio G/G0, where G and G0 are respectively the values in the redshift ranges z>0.1 and z<0.1, at the level of 1.5%.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Publisher statement:© 2018 IOP Publishing Ltd and Sissa Medialab.
Date accepted:17 October 2018
Date deposited:14 November 2018
Date of first online publication:29 October 2018
Date first made open access:29 October 2019

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