论文标题
4D爱因斯坦 - 高斯 - 尼特重力中的非旋转黑洞周围的邦迪 - 霍伊尔积聚
Bondi-Hoyle Accretion around the Non-rotating Black Hole in 4D Einstein-Gauss-Bonnet Gravity
论文作者
论文摘要
在本文中，通过使用高分辨率冲击捕获方案求解一般相对论的流体动力学方程，研究了新型四维爱因斯坦 - 加斯 - 骨重力对邦迪 - 霍伊尔积聚的数值研究。为此，从域中，来自域的遥远侧面的X射线二进制文件中的X射线二进制文件从域的遥远的侧面掉入了黑洞。我们研究了4D EGB重力中高斯 - 骨耦合在4D EGB重力中的影响对下游区域中产生的应计物质和冲击锥的影响。对于α<0的增加，在下游区域中具有冲击锥的所需时间越来越小。发现α的增加会导致冲击锥内部的剧烈振荡并提高积聚效率。剧烈振荡会导致X射线的能量通量，温度和光谱增加。因此，当-5 \ leq alpha \ leq 0.8时，准周期性振荡（QPO）是自然产生的。还可以证实，当alpha \ rightarrow 0时，EGB黑洞溶液在一般相对论中会收敛到Schwarzschild。
In this paper, the numerical investigation of a Bondi-Hoyle accretion around a non-rotating black hole in a novel four dimensional Einstein-Gauss-Bonnet gravity is investigated by solving the general relativistic hydrodynamical equations using the high resolution shock capturing scheme. For this purpose, the accreated matter from the wind-accreating X-ray binaries falls towards the black hole from the far upstream side of the domain, suphersonically. We study the effects of Gauss-Bonnet coupling constant $α$ in 4D EGB gravity on the accreated matter and shock cones created in the downstream region in detail. The required time having the shock cone in downstream region is getting smaller for alpha > 0 while it is increasing for alpha < 0. It is found that increases in alpha leads violent oscillations inside the shock cone and increases the accretion efficiency. The violent oscillations would cause increase in the energy flux, temperature, and spectrum of X- rays. So the quasi-periodic oscillations (QPOs) are naturally produced inside the shock cone when -5 \leq alpha \leq 0.8. It is also confirmed that EGB black hole solution converges to the Schwarzschild one in general relativity when alpha \rightarrow 0. Besides, the negative coupling constants also give reasonable physical solutions and increase of alpha in negative directions suppresses the possible oscillation observed in the shock cone.
