Tidal dynamics of black holes and self-force in strong gravitational fields

强引力场中黑洞的潮汐动力学和自力

• 批准号: 171367-2013
• 负责人: Poisson, Eric
• 金额: $ 1.82万
• 依托单位: University of Guelph
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=569611
• 关键词: Tidal; dynamics; black; holes; self

The proposal is divided into two broad streams, the tidal dynamics of black holes, and the self-force in spacetimes with matter. Binary systems of black holes are among the most promising and exciting sources of gravitational waves, and the tidal forces exerted on one black hole by its companion can have a strong impact on the dynamics of the binary system when its orbit is very tight, close to merger. For example, the tidal forces can torque the black hole and produce a change of spin, and they can heat the black hole and produce a change of mass; these processes affect the orbital motion and the form of the gravitational waves emitted by the system. These signatures can be measured and used to test the detailed predictions of general relativity concerning black holes. In the next granting cycle I will work toward obtaining a much better understanding of this tidal dynamics, focusing mostly on the astrophysically realistic case of rotating black holes. The self-force refers to a deviation from geodesic motion that occurs when a particle moving in spacetime can no longer be considered to be a test body. This happens, for example, when the particle carries an electric charge; in this case the charge produces an electromagnetic field that interacts with the ambiant spacetime curvature, and the field gives rise to a net force acting on the particle. This also happens when the particle's mass is sufficiently large that it affects the structure of spacetime around it; the gravitational perturbation creates an effective force that prevents the particle from moving on a geodesic of the background spacetime. In the next granting cycle I will continue my work on the electromagnetic and gravitational self-force. In particular, I will determine whether the self-force can act as a cosmic censor, preventing a black hole from being destroyed by absorbing a charged particle that would drive its charge beyond the allowed limit.

该提案分为两个广泛的溪流，黑洞的潮汐动态，以及与物质相处的自我强制性。 黑洞的二进制系统是引力波的最有前途，最令人兴奋的来源，当二进制系统非常紧密，接近合并时，其同伴施加在一个黑洞上的潮汐力可能会对二元系统的动力学产生强大的影响。例如，潮汐力可以扭矩黑洞并产生自旋的变化，它们可以加热黑洞并产生质量变化。这些过程会影响系统发出的引力波的轨道运动和形式。这些特征可以测量并用于测试有关黑洞的一般相对性的详细预测。在下一个授予周期中，我将努力更好地了解这种潮汐动力学，主要集中在天体物理上现实的旋转黑洞的情况下。 自力是指偏离地球运动的偏差，当不再认为在时空中移动的粒子被视为测试体时发生的偏差。例如，当粒子携带电荷时发生这种情况。在这种情况下，电荷会产生与Ambiant时空曲率相互作用的电磁场，并且该场产生作用在粒子上的净力。当粒子的质量足够大以至于会影响周围的时空结构时，也会发生这种情况。重力扰动会产生一种有效的力，可防止粒子在背景时空的大地测量上移动。在下一个授予周期中，我将继续在电磁和引力自我训练上进行工作。特别是，我将确定自我努力是否可以充当宇宙审查员，以防止黑洞通过吸收带电粒子将其电荷带到允许极限的限制而被破坏。