Zobrazeno 1 - 10
of 578
pro vyhledávání: '"de Oliveira, H. A."'
Autor:
Aranha, R. F., de Oliveira, H. P.
The two most common initial data for vacuum axisymmetric spacetimes are the Brill and Teukolsky gravitational waves. The subsequent numerical evolution of these data exhibits distinct properties mainly associated with the critical gravitational colla
Externí odkaz:
http://arxiv.org/abs/2409.04281
In this article we present a numerical code, based on the collocation or pseudospectal method, which integrates the equations of the BSSN formalism in cylindrical coordinates. In order to validate the code, we carried out a series of tests, using thr
Externí odkaz:
http://arxiv.org/abs/2409.01527
While numerous numerical relativity simulations adopt a 1+log slicing condition, shock-avoiding slicing conditions form a viable and sometimes advantageous alternative. Despite both conditions satisfying similar equations, recent numerical experiment
Externí odkaz:
http://arxiv.org/abs/2301.05874
Spherical collapse of non-top-hat profiles in the presence of dark energy with arbitrary sound speed
We study the spherical collapse of non-top-hat matter fluctuations in the presence of dark energy with arbitrary sound speed. The model is described by a system of partial differential equations solved using a pseudo-spectral method with collocation
Externí odkaz:
http://arxiv.org/abs/2210.14769
Autor:
Raj, Harshita, Theiler, C., Thornton, A., Fevrier, O., Gorno, S., Bagnato, F., Blanchard, P., Colandrea, C., de Oliveira, H., Duval, B. P., Labit, B., Perek, A., Reimerdes, H., Sheikh, U., Vallar, M., Vincent, B.
Nitrogen seeded detachment has been achieved in the Tokamak a Configuration Variable (TCV) in advanced divertor configurations (ADCs), namely X-divertor and X-point target, with and without baffles in H-mode plasmas with high core confinement. Both A
Externí odkaz:
http://arxiv.org/abs/2207.13305
Publikováno v:
Phys. Rev. D 106, 104059 (2022)
Motivated by recent numerical relativity simulations of charged black holes and their interactions, we explore the properties of common slicing conditions in Reissner-Nordstr\"om spacetimes. Specifically, we consider different choices for the so-call
Externí odkaz:
http://arxiv.org/abs/2207.12438
Autor:
Mendonça, T. S., de Oliveira, H. P.
Nonlinear field theories produce unstable but long-lived configurations known as oscillons. These structures have been studied with asymmetric and symmetric double-well potentials and extended to other forms of potentials. In the present work, we exa
Externí odkaz:
http://arxiv.org/abs/2206.07900
Autor:
De Oliveira, H., Theiler, C., Février, O., Reimerdes, H., Duval, B. P., Tsui, C. K., Gorno, S., Oliveira, D. S., Perek, A.
In-situ, two-dimensional (2D) Langmuir probe measurements across a large part of the TCV divertor are reported in L-mode discharges with and without divertor baffles. This provides detailed insights into time averaged profiles, particle fluxes, and f
Externí odkaz:
http://arxiv.org/abs/2204.05756
Autor:
de Oliveira, H. M., Cintra, R. J.
Publikováno v:
Gears of the future, CAP\'ITULO 22, pp. 257-271, Atena Editora, Fev., 2022
Discrete and continuous standard windowing are revisited and a a new taper is introduced, which is derived from the normal circular distribution by von Mises. Both the continuous-time and the discrete-time windows are considered, and their spectra ob
Externí odkaz:
http://arxiv.org/abs/2111.00188
Publikováno v:
Int. J. Modern Phys. D, 2250028 (2022)
We present a simple domain decomposition code based on the Galerkin-Collocation method to integrate the field equations of the Bondi problem. The algorithm is stable, exhibits exponential convergence when considering the Bondi formula as an error mea
Externí odkaz:
http://arxiv.org/abs/2110.09640