Zobrazeno 1 - 10
of 49
pro vyhledávání: '"Ricardo A. Mosna"'
Autor:
Daniel A. Beller, Thomas Machon, Simon Čopar, Daniel M. Sussman, Gareth P. Alexander, Randall D. Kamien, Ricardo A. Mosna
Publikováno v:
Physical Review X, Vol 4, Iss 3, p 031050 (2014)
We propose a construction of a cholesteric pitch axis for an arbitrary nematic director field as an eigenvalue problem. Our definition leads to a Frenet-Serret description of an orthonormal triad determined by this axis, the director, and the mutuall
Externí odkaz:
https://doaj.org/article/e361f4c2c0fb46d586ab5042e2c06a66
We introduce an analog model for the conformally coupled scalar field on the BTZ black hole. The model is based on the propagation of acoustic waves in a Laval nozzle. Since the BTZ black hole is not a globally hyperbolic spacetime, the dynamics of t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e5fcb7d8939109ae6584c6b2ee898084
Publikováno v:
Physical Review D. 106
We investigate the long-term orbital dynamics of spinless extended bodies in Schwarzschild geometry, and show that periodic deviations from spherical symmetry in the shape of a test body may trigger the onset of chaos. We do this by applying Dixon's
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b471e97aa485b0a59ec1b3292a7dd092
https://doi.org/10.1103/physrevd.106.024016
https://doi.org/10.1103/physrevd.106.024016
Autor:
Ronaldo S.S. Vieira, Ricardo A. Mosna
There is a long tradition of studying chaotic trajectories in systems whose integrability is broken by means of an external perturbation. Here we explore a different route to chaos, in the dynamics of extended bodies, which arises due to finite-size
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3b361af6122607466601463068c151cf
http://arxiv.org/abs/2207.01594
http://arxiv.org/abs/2207.01594
We present an analog model for the Ba\~nados, Teitelboim, Zanelli (BTZ) black hole based on a hydrodynamical flow. We numerically solve the fully nonlinear hydrodynamic equations of motion and observe the excitation and decay of the analog BTZ quasin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::20a95c0dd827355ee05810ae4e3739cd
http://arxiv.org/abs/2206.01147
http://arxiv.org/abs/2206.01147
We revisit the propagation of classical scalar fields in a spacetime which is asymptotically anti-de Sitter. The lack of global hyperbolicity of the underlying background gives rise to an ambiguity in the dynamical evolution of solutions of the wave
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::73ff44920ebe9541d725fc374bbe786d
Publikováno v:
Physical Review D. 104
We present analogue models for the Schwarzschild and Reissner-Nordstr\"om (RN) spacetimes based on unidirectional hydrodynamic flows. We show that, with appropriate coordinate transformations, sound waves in a moving fluid propagate as scalar fields
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8ebf441a1c49e1c8903f6619fe109a0e
https://doi.org/10.1103/physrevd.104.024036
https://doi.org/10.1103/physrevd.104.024036
Publikováno v:
Physical Review D. 102
Quantum fluctuations of the vacuum stress-energy tensor are highly non-Gaussian, and can have unexpectedly large effects on spacetime geometry. In this paper, we study a two-dimensional dilaton gravity model coupled to a conformal field, in which the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6e11912d6ab83d44b2ab79e1e57d8cc4
https://doi.org/10.1103/physrevd.102.126018
https://doi.org/10.1103/physrevd.102.126018
Autor:
Randall D Kamien, Ricardo A Mosna
Publikováno v:
New Journal of Physics, Vol 18, Iss 5, p 053012 (2016)
The order parameter of the smectic liquid crystal phase is the same as that of a superfluid or superconductor, namely a complex scalar field. We show that the essential difference in boundary conditions between these systems leads to a markedly diffe
Externí odkaz:
https://doaj.org/article/b8f7a218925a45a19b4507913d79a155
Quantum field theory on anti-de Sitter spacetime requires the introduction of boundary conditions at its conformal boundary, due essentially to the absence of global hyperbolicity. Here we calculate the renormalized stress-energy tensor $T_{\mu\nu}$
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::49f81f74c1f4205ea88468d4f6720cbc
http://arxiv.org/abs/1904.10806
http://arxiv.org/abs/1904.10806