论文标题
重力镜头对快速瞬态事件速率的影响
The Effect of Gravitational Lensing on Fast Transient Event Rates
论文作者
论文摘要
快速的宇宙瞬变，例如快速无线电爆发（FRB）和伽马射线爆发（GRB），代表了比任何其他宇宙学对象更紧凑的一类来源。因此，它们通过从当今观察结果不大的镜头中的重力透镜来敏感。低质量原始黑洞就是这样的候选者，可能占宇宙暗物质的很大一部分。当前的观察结果只会限制其在附近宇宙中的密度，从而从宇宙学的快速瞬变产生了形成互补约束的潜力。在此激励的情况下，我们计算出来自紧凑物体的宇宙学分布的重力镜头对观察到的FRB和GRB的速率。对于静态晶状体几何形状，我们排除了一个前景，即所有FRB都在一系列镜头上重力镜头，并表明镜头大于$ 10^{ - 5} M_ \ odot $可以通过1.4GHz的8000个未定位的高频FRB来限制，因为下一代的frbs可能会被1.4GHz所检测到。
Fast cosmological transients such as fast radio bursts (FRBs) and gamma-ray bursts (GRBs) represent a class of sources more compact than any other cosmological object. As such they are sensitive to significant magnification via gravitational lensing from a class of lenses which are not well-constrained by observations today. Low-mass primordial black holes are one such candidate which may constitute a significant fraction of the Universe's dark matter. Current observations only constrain their density in the nearby Universe, giving fast transients from cosmological distances the potential to form complementary constraints. Motivated by this, we calculate the effect that gravitational lensing from a cosmological distribution of compact objects would have on the observed rates of FRBs and GRBs. For static lensing geometries, we rule out the prospect that all FRBs are gravitationally lensed for a range of lens masses and show that lens masses greater than $10^{-5}M_\odot$ can be constrained with 8000 un-localised high fluence FRBs at 1.4GHz, as might be detected by the next generation of FRB-finding telescopes.
