DECIGO/BBO as a Probe to Constrain Alternative Theories of Gravity
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概要
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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 ω_<BD> and the graviton Compton length λ_g. Assuming a (1.4,10)M_⦿ NS/BH binary of SNR=√<200>, the constraint on ω_<BD> is obtained as ω_<BD> >2.32×10^6, 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 ω_<BD> >3.77×10^8, 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_⦿ BH/BH binary at 3Gpc, one can put a constraint λ_g>3.35×10^<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 also understood that DECIGO/BBO is a very powerful tool for constraining alternative theories of gravity.
- 2010-06-25
著者
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YAGI Kent
Department of Physics, Kyoto University
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TANAKA Takahiro
Yukawa Institute for Theoretical Physics, Kyoto University
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Yagi Kent
Department Of Physics Kyoto University
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Tanaka Takahiro
Yukawa Institute For Theoretical Physics Kyoto University
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