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- W2116740970 abstract "We calculate how strongly one can constrain the alternative theories of gravity with deci-Hz gravitational wave interferometers such as DECIGO and BBO. Here we discuss Brans-Dicke theory and massive graviton theories as typical examples. We consider the inspiral of compact binaries composed of a neutron star (NS) and an intermediate mass black hole (IMBH) for Brans-Dicke (BD) theory and those composed of a super massive black hole (SMBH) and a black hole (SMBH) for massive graviton theories. Using the restricted 2PN waveforms including spin effects and taking the spin precession into account, we perform the Monte Carlo simulations of $10^4$ binaries to estimate the determination accuracy of binary parameters including the Brans-Dicke parameter $omega_{mathrm{BD}}$ and the graviton Compton length $lambda_g$. Assuming a $(1.4, 10)M_{odot}$ NS/BH binary of SNR=$sqrt{200}$, the constraint on $omega_{mathrm{BD}}$ is obtained as $omega_{mathrm{BD}}>2.32times 10^6$, which is 300 times stronger than the estimated constraint from LISA observation. Furthermore, we find that, due to the expected large merger rate of NS/BH binaries of $O(10^4)$ yr$^{-1}$, a statistical analysis yields $omega_{mathrm{BD}}>3.77times10^8$, which is 4 orders of magnitude stronger than the current strongest bound obtained from the solar system experiment. For massive graviton theories, assuming a $(10^6, 10^5)M_{odot}$ BH/BH binary at 3Gpc, one can put a constraint $lambda_g>3.35times10^{20}$cm, on average. This is three orders of magnitude stronger than the one obtained from the solar system experiment. From these results, it is understood that DECIGO/BBO is a very powerful tool for constraining alternative theories of gravity, too." @default.
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- W2116740970 date "2010-06-01" @default.
- W2116740970 modified "2023-10-03" @default.
- W2116740970 title "DECIGO/BBO as a Probe to Constrain Alternative Theories of Gravity" @default.
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- W2116740970 doi "https://doi.org/10.1143/ptp.123.1069" @default.
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