Zobrazeno 1 - 10
of 86
pro vyhledávání: '"Boekholt, Tjarda"'
We use analytical and $N$-body methods to study the capture of field stars by gravitating substructures moving across a galactic environment. The majority of stars captured by a substructure move on temporarily-bound orbits that are lost to galactic
Externí odkaz:
http://arxiv.org/abs/2404.19069
Autor:
Trani, Alessandro Alberto, Leigh, Nathan W. C., Boekholt, Tjarda C. N., Zwart, Simon Portegies
Publikováno v:
A&A 689, A24 (2024)
The three-body problem (3BP) poses a longstanding challenge in physics and celestial mechanics. Despite the impossibility of obtaining general analytical solutions, statistical theories have been developed based on the ergodic principle. This assumpt
Externí odkaz:
http://arxiv.org/abs/2403.03247
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 533, Issue 2, September 2024, Pages 1766-1781
We investigate the thermodynamics of close encounters between stellar mass black holes (BHs) in the gaseous discs of active galactic nuclei (AGN), during which binary black holes (BBHs) may form. We consider a suite of 2D viscous hydrodynamical simul
Externí odkaz:
http://arxiv.org/abs/2312.14431
Autor:
Beckers, Sam J., Poppelaars, Colin M., Ulibarrena, Veronica S., Boekholt, Tjarda C. N., Zwart, Simon F. Portegies
Publikováno v:
A&A 685, A12 (2024)
Located at the core of the Galactic Centre, the S-star cluster serves as a remarkable illustration of chaos in dynamical systems. The long-term chaotic behaviour of this system can be studied with gravitational $N$-body simulations. By applying a sma
Externí odkaz:
http://arxiv.org/abs/2312.08460
Recently we estimated that about 5 percent of supermassive black hole triple systems are fundamentally unpredictable. These gargantuan chaotic systems are able to exponentially magnify Planck length perturbations to astronomical scales within their i
Externí odkaz:
http://arxiv.org/abs/2311.07651
The black hole (BH) binaries in active galactic nuclei (AGN) are expected to form mainly through scattering encounters in the ambient gaseous medium. Recent simulations, including our own, have confirmed this formation pathway is highly efficient. We
Externí odkaz:
http://arxiv.org/abs/2309.14433
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 531, Issue 4, July 2024, Pages 4656-4680
We investigate close encounters by stellar mass black holes (BHs) in the gaseous discs of active galactic nuclei (AGN) as a potential formation channel of binary black holes (BBHs). We perform a series of 2D isothermal viscous hydrodynamical simulati
Externí odkaz:
http://arxiv.org/abs/2309.11561
We investigate the chaotic behavior of the S-star cluster in the Galactic center using precise $N$-body calculations, free from round-off or discretization errors. Our findings reveal that chaos among the Galactic center S-stars arises from close enc
Externí odkaz:
http://arxiv.org/abs/2308.14817
Dynamical chaos is a fundamental manifestation of gravity in astrophysical, many-body systems. The spectrum of Lyapunov exponents quantifies the associated exponential response to small perturbations. Analytical derivations of these exponents are cri
Externí odkaz:
http://arxiv.org/abs/2308.14803
The time step criterion plays a crucial role in direct N-body codes. If not chosen carefully, it will cause a secular drift in the energy error. Shared, adaptive time step criteria commonly adopt the minimum pairwise time step, which suffers from dis
Externí odkaz:
http://arxiv.org/abs/2212.09745