Encontrados 7 documentos, a visualizar página 1 de 1
Mathisson's helical motions for a spinning particle: Are they unphysical?
Costa, L. Filipe; Herdeiro, Carlos; Natario, Jose; Zilhão, MiguelIt has been asserted in the literature that Mathisson's helical motions are unphysical, with the argument that their radius can be arbitrarily large. We revisit Mathisson's helical motions of a free spinning particle, and observe that such statement is unfounded. Their radius is finite and confined to the disk of centroids. We argue that the helical motions are perfectly valid and physically equivalent descript...
Higher-dimensional puncture initial data
Zilhão, Miguel; Ansorg, Marcus; Cardoso, Vitor; Gualtieri, Leonardo; Herdeiro, Carlos; Sperhake, Ulrich; Witek, HelviWe calculate puncture initial data, corresponding to single and binary black holes with linear momenta, which solve the constraint equations of D-dimensional vacuum gravity. The data are generated by a modification of the pseudospectral code presented in [M. Ansorg, B. Bruegmann, and W. Tichy, Phys. Rev. D 70, 064011 (2004).] and made available as the TWOPUNCTURES thorn inside the CACTUS computational toolkit. ...
Head-on collisions of unequal mass black holes in D=5 dimensions
Witek, Helvi; Cardoso, Vitor; Gualtieri, Leonardo; Herdeiro, Carlos; Sperhake, Ulrich; Zilhao, MiguelWe study head-on collisions of unequal mass black hole binaries in D = 5 spacetime dimensions, with mass ratios between 1:1 and 1:4. Information about gravitational radiation is extracted by using the Kodama-Ishibashi gauge-invariant formalism and details of the apparent horizon of the final black hole. We present waveforms, total integrated energy and momentum for this process. Our results show surprisingly go...
Numerical Relativity in D dimensional space-times: Collisions of unequal mass b...
Witek, Helvi; Cardoso, Vitor; Gualtieri, Leonardo; Herdeiro, Carlos; Sperhake, Ulrich; Zilhão, MiguelWe present unequal mass head-on collisions of black holes in D = 5 dimensional space-times. We have simulated BH systems with mass ratios q = 1,1/2,1/3,1/4. We extract the total energy radiated throughout the collision and compute the linear momentum flux and the recoil velocity of the final black hole. The numerical results show very good agreement with point particle calculations when extrapolated to this limit.
Simulations of black holes in compactified spacetimes
Zilhão, Miguel; Cardoso, Vitor; Gualtieri, Leonardo; Herdeiro, Carlos; Nerozzi, Andrea; Sperhake, Ulrich; Witek, HelviFrom the gauge/gravity duality to braneworld scenarios, black holes in compactified spacetimes play an important role in fundamental physics. Our current understanding of black hole solutions and their dynamics in such spacetimes is rather poor because analytical tools are capable of handling a limited class of idealized scenarios, only. Breakthroughs in numerical relativity in recent years, however, have opene...
Black holes in a box: Toward the numerical evolution of black holes in AdS spac...
Witek, Helvi; Cardoso, Vitor; Herdeiro, Carlos; Nerozzi, Andrea; Sperhake, Ulrich; Zilhão, MiguelThe evolution of black holes in "confining boxes" is interesting for a number of reasons, particularly because it mimics the global structure of anti-de Sitter geometries. These are nonglobally hyperbolic space-times and the Cauchy problem may only be well defined if the initial data are supplemented by boundary conditions at the timelike conformal boundary. Here, we explore the active role that boundary condit...
Numerical relativity for D dimensional space-times: Head-on collisions of black...
Witek, Helvi; Zilhão, Miguel; Gualtieri, Leonardo; Cardoso, Vitor; Herdeiro, Carlos; Nerozzi, Andrea; Sperhake, UlrichHigher dimensional black holes play an exciting role in fundamental physics, such as high energy physics. In this paper, we use the formalism and numerical code reported in [1] to study the head-on collision of two black holes. For this purpose we provide a detailed treatment of gravitational wave extraction in generic D dimensional space-times, which uses the Kodama-Ishibashi formalism. For the first time, we ...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||