Spanish and Portuguese Relativity Meeting

Session

Parallel session 4 (Black Holes I)

Jul 22, 2024, 4:30 PM

Conveners

Parallel session 4 (Black Holes I)

• Session convener: Filipe Moura

23. Hidden symmetries in the dynamics of perturbed black holes

Michele Lenzi (Institute of Space Sciences (ICE-CSIC))

7/22/24, 4:30 PM

Perturbation theory of vacuum spherically symmetric spacetimes is a crucial tool for understanding the dynamics of black hole (BH) perturbations as well as BH scattering phenomena and the ringdown signal of binary BHs. Since the pioneering work of Regge and Wheeler it is known that the equations for the perturbations can be decoupled in terms of (gauge-invariant) master functions that satisfy...

31. Radiation reaction in magnetized black holes: can the tail term be ignored?

João Sieiro dos Santos (Instituto Superior Técnico, CENTRA)

7/22/24, 4:45 PM

We study radiation from charged particles in circular motion around a Schwarzschild black hole immersed in an asymptotically uniform magnetic field. In curved space, the radiation reaction force is described by the DeWitt-Brehme equation, which includes a complicated, non-local tail term. We studied this system in the weak field regime, where the tail term can be treated directly, and in the...

19. The canonical ensemble of a d-dimensional Reissner-Nordstrom black hole in a cavity

Tiago Vasques Fernandes

7/22/24, 5:00 PM

We construct the canonical ensemble of a Reissner-Nordström black hole in a cavity for an arbitrary number of dimensions. The system of a charged black hole in a cavity can be described by a partition function given by the Euclidean path integral approach, where we consider the usual Einstein-Maxwell action with the Gibbons-Hawking-York boundary term and an additional boundary term of the...

52. Monte Carlo methods for stationary solutions of general-relativistic Vlasov systems

Patryk Mach

7/22/24, 5:15 PM

I will discuss a Monte Carlo method designed to compute stationary solutions of the general-relativistic Vlasov equation describing a gas of non-colliding particles. Our method consists of three elements: 1) selecting a set of parameters of individual trajectories, which correspond to assumed properties of the distribution function (e.g., initial, asymptotic or boundary conditions), 2) solving...

53. Monte Carlo methods for stationary solutions of general-relativistic Vlasov systems: Planar accretion onto a moving Schwarzschild black hole

Mr Adam Cieślik (Jagiellonian University)

7/22/24, 5:30 PM

I will present the results of a Monte Carlo simulation of a planar accretion of the relativistic Vlasov gas onto a moving Schwarzschild black hole. The gas is assumed to be in thermal equilibrium at infinity, where it obeys the Maxwell-Jüttner distribution. Monte Carlo results consistently confirm the analytically derived exact expressions for particle current density in all examined cases....