Search for a stochastic gravitational-wave background using a pair of torsion-bar antennas
Search for a stochastic gravitational-wave background using a pair of torsion-bar antennas
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DOI：
10.1103/physrevd.89.027101
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发表时间：
2013-11
影响因子：
5
通讯作者：
A. Shoda;M. Ando;K. Ishidoshiro;K. Okada;W. Kokuyama;Y. Aso;K. Tsubono
中科院分区：
文献类型：
--
作者：
A. Shoda;M. Ando;K. Ishidoshiro;K. Okada;W. Kokuyama;Y. Aso;K. Tsubono
We have set a new upper limit on the stochastic gravitational-wave background using two prototype torsion-bar antennas (TOBAs). A TOBA is a low-frequency gravitational-wave detector with bar-shaped test masses rotated by the tidal force of gravitational waves. As a result of simultaneous 7-hour observations with TOBAs in Tokyo and Kyoto in Japan, our upper limit with a confidence level of 95% is ${\mathrm{\ensuremath{\Omega}}}_{\mathrm{gw}}{h}_{0}^{2}l1.9\ifmmode\times\else\texttimes\fi{}{10}^{17}$ at 0.035--0.830 Hz, where ${h}_{0}$ is the Hubble constant in units of $100\text{ }\text{ }\mathrm{km}/\mathrm{s}/\mathrm{Mpc}$ and ${\mathrm{\ensuremath{\Omega}}}_{\mathrm{gw}}$ is the gravitational-wave energy density per logarithmic frequency interval in units of the closure density. We successfully updated the upper limit and extended the explored frequency band.
We have set a new upper limit on the stochastic gravitational-wave background using two prototype torsion-bar antennas (TOBAs). A TOBA is a low-frequency gravitational-wave detector with bar-shaped test masses rotated by the tidal force of gravitational waves. As a result of simultaneous 7-hour observations with TOBAs in Tokyo and Kyoto in Japan, our upper limit with a confidence level of 95% is ${\mathrm{\ensuremath{\Omega}}}_{\mathrm{gw}}{h}_{0}^{2}l1.9\ifmmode\times\else\texttimes\fi{}{10}^{17}$ at 0.035--0.830 Hz, where ${h}_{0}$ is the Hubble constant in units of $100\text{ }\text{ }\mathrm{km}/\mathrm{s}/\mathrm{Mpc}$ and ${\mathrm{\ensuremath{\Omega}}}_{\mathrm{gw}}$ is the gravitational-wave energy density per logarithmic frequency interval in units of the closure density. We successfully updated the upper limit and extended the explored frequency band.