Zobrazeno 1 - 10
of 84
pro vyhledávání: '"Cunha, Pedro V. P."'
Publikováno v:
JCAP 08 (2024) 055
The Einstein field equations, or generalizations thereof, are difficult to solve analytically. On the other hand, numerical solutions of the same equations have become increasingly common, in particular concerning compact objects. Whereas analytic ap
Externí odkaz:
http://arxiv.org/abs/2405.15651
Autor:
Machado, Mateus G., Melo, João G., Zanchettin, Cleber, Braga, Pedro H. M., Cunha, Pedro V., Barros, Edna N. S., Bassani, Hansenclever F.
This work investigates the potential of Reinforcement Learning (RL) to tackle robot motion planning challenges in the dynamic RoboCup Small Size League (SSL). Using a heuristic control approach, we evaluate RL's effectiveness in obstacle-free and sin
Externí odkaz:
http://arxiv.org/abs/2404.15410
We analyse the lensing images by dynamically robust rotating (mini-)Proca stars surrounded by thin accretion disks. Due to their peculiar geodesic structure we show that these images exhibit striking similarities with the ones of BHs, for appropriate
Externí odkaz:
http://arxiv.org/abs/2402.14919
It has been established that Black Hole (BH) spacetimes obeying some general set of assumptions always possess, at least, one light ring (per rotation sense) [arXiv:2003.06445]. This theorem was originally established for asymptotically flat, station
Externí odkaz:
http://arxiv.org/abs/2401.05495
Autor:
Ayzenberg, Dimitry, Blackburn, Lindy, Brito, Richard, Britzen, Silke, Broderick, Avery E., Carballo-Rubio, Raúl, Cardoso, Vitor, Chael, Andrew, Chatterjee, Koushik, Chen, Yifan, Cunha, Pedro V. P., Davoudiasl, Hooman, Denton, Peter B., Doeleman, Sheperd S., Eichhorn, Astrid, Eubanks, Marshall, Fang, Yun, Foschi, Arianna, Fromm, Christian M., Galison, Peter, Ghosh, Sushant G., Gold, Roman, Gurvits, Leonid I., Hadar, Shahar, Held, Aaron, Houston, Janice, Hu, Yichao, Johnson, Michael D., Kocherlakota, Prashant, Natarajan, Priyamvada, Olivares, Héctor, Palumbo, Daniel, Pesce, Dominic W., Rajendran, Surjeet, Roy, Rittick, Saurabh, Shao, Lijing, Tahura, Shammi, Tamar, Aditya, Tiede, Paul, Vincent, Frédéric H., Visinelli, Luca, Wang, Zhiren, Wielgus, Maciek, Xue, Xiao, Yakut, Kadri, Yang, Huan, Younsi, Ziri
The Event Horizon Telescope (EHT) Collaboration recently published the first images of the supermassive black holes in the cores of the Messier 87 and Milky Way galaxies. These observations have provided a new means to study supermassive black holes
Externí odkaz:
http://arxiv.org/abs/2312.02130
Within nonlinear electrodynamics (NED), photons follow null geodesics of an effective geometry, which is different from the geometry of the spacetime itself. Over the last years, several works were dedicated to investigate the motion of photons in th
Externí odkaz:
http://arxiv.org/abs/2305.04776
We investigate the gravitational lensing by spinning Proca stars and the shadows and lensing by Kerr black holes (BHs) with synchronised Proca hair, discussing both theoretical aspects and observational constraints from the Event Horizon Telescope (E
Externí odkaz:
http://arxiv.org/abs/2209.06237
The motion of particles on spherical $1 + 3$ dimensional spacetimes can, under some assumptions, be described by the curves on a 2-dimensional manifold, the optical and Jacobi manifolds for null and timelike curves, respectively. In this paper we res
Externí odkaz:
http://arxiv.org/abs/2207.14506
Publikováno v:
Phys. Rev. Lett. 130 (2023) 061401
Ultracompact objects with light-rings (LRs) but without an event horizon could mimic black holes (BHs) in their strong gravity phenomenology. But are such objects dynamically viable? Stationary and axisymmetric ultracompact objects that can form from
Externí odkaz:
http://arxiv.org/abs/2207.13713
Autor:
Junior, Haroldo C. D. Lima, Yang, Jian-Zhi, Crispino, Luís C. B., Cunha, Pedro V. P., Herdeiro, Carlos A. R.
The light rings (LRs) topological charge (TC) of a spacetime measures the number of stable LRs minus the number of unstable LRs. It is invariant under smooth spacetime deformations obeying fixed boundary conditions. Asymptotically flat equilibrium bl
Externí odkaz:
http://arxiv.org/abs/2112.10802