Constraints on Brans-Dicke gravity from neutron star-black hole merger events using higher harmonics

被引：0
作者：
Tan, Jing [1 ]
Wang, Baoxiang [1 ]
机构：
[1] Sun Yat Sen Univ, Sch Phys & Astron, 2 Daxue Rd, Zhuhai 519082, Peoples R China
来源：
PHYSICAL REVIEW D | 2024年 / 109卷 / 08期
关键词：
SCALAR-TENSOR GRAVITY; GRAVITATIONAL-RADIATION; GENERAL-RELATIVITY; BINARY-SYSTEMS; NUCLEOSYNTHESIS; LIGO;
D O I：
10.1103/PhysRevD.109.084036
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Brans-Dicke (BD) theory is one of the simplest scalar-tensor theories, with potential applications in dark matter, dark energy, inflation, and primordial nucleosynthesis. The strongest constraint on the BD coupling constant is provided by the Cassini measurement of the Shapiro time delay in the Solar System. Constraints from gravitational wave (GW) events are subject to asymmetric binaries. The third Gravitational-Wave Transient Catalog (GWTC) reports a neutron star-black hole (NSBH) merger event, GW200115, making it possible to constrain BD by GW. With the aid of this source and Bayesian Markov-chain Monte Carlo (MCMC) analyses, we derive a 90% credible lower bound on the modified parameter of scalar-tensor theories as phi(-2)> -7.94x10(-4)by using dominant-mode correction. Specific to BD theory, we have the constraint omega(BD )> 4.75. Asymmetric binary systems usually have a significant mass ratio; in such cases, higher harmonic modes cannot be neglected. Our work considers higher harmonic corrections from scalar-tensor theories and provides a tighter constraint of phi(-2)> -7.59x10(-4). Transitioning to BD theory, the constraint is omega(BD )> 5.06, with a 6.5% improvement. We also consider a plausible NSBH event, GW190814, which is a highly unequal mass ratio source that exhibits strong evidence for higher-order multipoles. We obtain poorly converged results when using the dominant mode, while getting a constraint of phi(-2 )> -6.60x10(-4) on scalar-tensor theories when including the higher harmonic modes. This suggests that the difference between the dominant mode and higher modes has a significant impact on our analysis. Furthermore, treating this suspected event as an NSBH event, we find omega(BD )> 6.12 when including the higher harmonic modes. Combining GW200115 and GW190814 and including higher modes, the constraint is improved to omega(BD )> 110.55. This is currently the strongest constraint utilizing GWs, contingent upon GW190814 being an NSBH event. Additionally, we take into account a BD-like theory, known as screened modified gravity, and investigate the coupling constant constraints, both with and without higher-mode corrections, by using data from both GW200115 and GW190814.
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