用星系大小的脉冲星网络捕捉引力波
Catching Gravitational Waves With A Galaxy-sized Net Of Pulsars
摘要：
直到最近，观察宇宙的唯一方法是通过望远镜接收光线。但我们现在能够测量引力波，这是阿尔伯特·爱因斯坦预测的宇宙结构中的涟漪。如果两个密度非常大的物体（比如黑洞）相互靠近，它们就会扭曲空间并发出引力波。对于质量与太阳相似的黑洞，科学家使用地球上的LIGO探测器。但是对于宇宙中最大的黑洞（比太阳大数十亿倍），科学家们监测着银河系中快速旋转的中子星（称为中子星）。任何经过的引力波都会改变这些恒星发出的无线电信号到达地球所需的时间。NANOGrav合作组织在11年的时间里监测了34颗这样的恒星，试图探测来自巨大黑洞的引力波。
英文摘要：
Until recently, the only way to observe the Universe was from light received by telescopes. But we are now able to measure gravitational waves, which are ripples in the fabric of the Universe predicted by Albert Einstein. If two very dense objects (like black holes) orbit each other closely, they warp space and send out gravitational waves. For black holes that are similar in mass to the Sun, scientists use the LIGO detector on Earth. But for the biggest black holes in the Universe (billions of times more massive than the Sun), scientists monitor a net of rapidly-spinning neutron stars (called pulsars) across the Milky Way. Any gravitational wave passing by will change how long radio signals from these pulsars take to get to Earth. The NANOGrav Collaboration monitored 34 of these pulsars over 11 years, in an attempt to detect gravitational waves from giant black holes.
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