论文标题
扩展基于脉冲星时阵列阵列的引力波搜索的频率范围，而无需高节奏观察
Extending the frequency reach of pulsar timing array based gravitational wave search without high cadence observations
论文作者
论文摘要
假定使用PULSAR计时阵列（PTA）的引力波（GW）搜索被典型的平均观察性节奏限制在$ 1/（2〜 {\ rm Weeks}）$中，对于单个PULSAR到GW频率$ \ lisssim 4 \ times 10^{ - 7} $ hz。我们表明，该假设是不正确的，并且PTA可以通过利用从多个脉冲星的异步观察结果来检测频率更高的信号，这些信号由于混叠而保存在数据中。这允许观察策略可扩展到未来包含$ o（10^3）$ pulsars的大型PTA，该策略由五百米的孔径球形望远镜和方形千米阵列启用，而无需每杆人观测的较高观测节奏。我们表明，具有较高的GW观察结果，最高$ 4 \ times 10^{-4} $ Hz具有SKA-ers时代的PTA，具有显着的天体物理含义，例如（i）比当前对GW的高度限制的三个数量量的约束，在$ [10,400] $ $ unders nots and $ [10,400] $ unish vans and（II $ under）的高度观察中（\ rmhz}）使用灵感，合并和环形信号的超级质量黑洞二进制文件的质量定理。
Gravitational wave (GW) searches using pulsar timing arrays (PTAs) are assumed to be limited by the typical average observational cadence of $1/(2~{\rm weeks})$ for a single pulsar to GW frequencies $\lesssim 4\times 10^{-7}$ Hz. We show that this assumption is incorrect and that a PTA can detect signals with much higher frequencies, which are preserved in the data due to aliasing, by exploiting asynchronous observations from multiple pulsars. This allows an observation strategy that is scalable to future large-scale PTAs containing $O(10^3)$ pulsars, enabled by the Five-hundred meter Aperture Spherical Telescope and the Square Kilometer Array, without requiring a higher per-pulsar observation cadence. We show that higher frequency GW observations, reaching up to $4\times 10^{-4}$ Hz with an SKA-era PTA, have significant astrophysical implications, such as (i) a three orders of magnitude better constraint than current high-cadence observations on GW strain in the $[10,400]$ $μ{\rm Hz}$ band, and (ii) sensitive tests of the no-hair theorem in the mass range of supermassive black hole binaries using their inspiral, merger, and ringdown signals.
