标题： 轴子玻色子星碰撞的电磁辐射 显示英文标题

标题： Electromagnetic emission from axionic boson star collisions

摘要： 我们通过爱因斯坦场方程的非线性演化，研究了在轴子耦合存在下的玻色子星的动力学。 我们表明，对于大的轴子耦合，孤立的玻色子星变得不稳定，并通过大量电磁辐射的爆发而衰变，变得质量更小且更稀疏。 我们的完整非线性结果与平坦空间对临界耦合的估计结果良好一致。 然后我们考虑次临界玻色子星的正面碰撞，并研究电磁和引力信号。 玻色子星通过相互作用聚集在临界点附近，我们认为除了引力波之外，并发的合并事件也通常是电磁辐射的来源，如果检测到这种多信使信号，可以用来对轴子耦合进行约束。 显示英文摘要

摘要： We explore the dynamics of boson stars in the presence of axionic couplings through nonlinear evolutions of Einstein's field equations. We show that, for large axionic couplings, isolated boson stars become unstable, and decay via a large burst of electromagnetic radiation, becoming less massive and more dilute. Our full nonlinear results are in good agreement with flat-space estimates for the critical couplings. We then consider head-on collisions of sub-critical boson stars and study the electromagnetic and gravitational signal. Boson stars cluster around the critical point via interactions, and we argue that mergers will generically be also sources of electromagnetic radiation, in addition to gravitational waves, which can be used to place constraints on the axionic coupling if such multimessenger signals are detected.