Constraining the Stochastic Gravitational Wave from String Cosmology with Current and Future High-frequency Detectors,The Astrophysical Journal

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Constraining the Stochastic Gravitational Wave from String Cosmology with Current and Future High-frequency Detectors
The Astrophysical Journal ( IF 4.8 ) Pub Date : 2019-12-06 , DOI: 10.3847/1538-4357/ab4e18
Yufeng Li _{1,

2} , Xilong Fan ₃ , Lijun Gou _{1,

2}

Affiliation

Pre-Big-Bang (PBB) models in string cosmology predict a relic background of gravitational wave radiation in the early universe. The spectrum of this background shows that the energy-density rises rapidly with frequency, which is an interesting target for high frequency (i.e. kHz) detectors. In this paper, we discussed the constraining power of multiple configurations of current and future gravitational wave detector network to the stochastic background predicted in string cosmology. The constraining power is jointly determined by the overlap reduction function and the sensitivity curves of multiple detectors. And we further elaborated the possible contribution of a future Chinese detector and a kHz detector to the constraining power of detector network for stochastic background in string cosmology. Our results shows that the detectability of gravitational wave detector network for the string cosmology gravitational wave background will improve considerably with the joining of a Chinese detector. This is because a Chinese detector (e.g. located at Wuhan) together with KAGRA have better overlap reduction function than the LIGO detector pair, and therefore lead to more stringent limit for stochastic background detection. And with ideal overlap reduction function, namely, co-located detectors, a kHz sensitivity curve has better performance than previous detectors for stochastic background detection. Finally, the results are compared with the limitations given by observational constraint Big Bang nucleosynthesis bound.

更新日期：2019-12-06

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