Zobrazeno 1 - 10
of 23
pro vyhledávání: '"Bettencourt, L. M."'
Autor:
Loxley, P. N., Bettencourt, L. M.
A convolution model which accounts for neural activity dynamics in the primary visual cortex is derived and used to detect visually salient contours in images. Image inputs to the model are modulated by long-range horizontal connections, allowing con
Externí odkaz:
http://arxiv.org/abs/1103.3531
Publikováno v:
Acta Phys.Polon.B31:2937,2000
We discuss the origin of topological defects in phase transitions and analyze their role as a "diagnostic tool" in the study of the non-equilibrium dynamics of symmetry breaking. Homogeneous second order phase transitions are the focus of our attenti
Externí odkaz:
http://arxiv.org/abs/1003.2228
Publikováno v:
Phys.Rev. D62 (2000) 065005
The Ginzburg temperature has historically been proposed as the energy scale of formation of topological defects at a second order symmetry breaking phase transition. More recently alternative proposals which compute the time of formation of defects f
Externí odkaz:
http://arxiv.org/abs/hep-ph/0001205
Autor:
Antunes, N. D., Bettencourt, L. M. A.
Publikováno v:
Phys.Rev.Lett. 81 (1998) 3083-3086
We characterize the statistical length distribution of vortex strings by studying the non-perturbative thermodynamics of scalar U(1) field theory in 3D. All parameters characterizing the length distributions exhibit critical behavior at $T_c$ and we
Externí odkaz:
http://arxiv.org/abs/hep-ph/9807248
Autor:
Antunes, N. D., Bettencourt, L. M. A.
Publikováno v:
Phys.Rev. D55 (1997) 925-937
We study the full out-of-thermal-equilibrium dynamics of a relativistic classical scalar field through a symmetry breaking phase transition. In these circumstances we determine the evolution of the ensemble averages of the correlation length and topo
Externí odkaz:
http://arxiv.org/abs/hep-ph/9605277
Publikováno v:
Phys.Rev. D53 (1996) 668-680
We develop winding number correlation functions that allow us to assess the role of field fluctuations on vortex formation in an Abelian gauge theory. We compute the behavior of these correlation functions in simple circumstances and show how fluctua
Externí odkaz:
http://arxiv.org/abs/hep-ph/9506215
Autor:
Bettencourt, L. M. A., Rivers, R. J.
Publikováno v:
Phys.Rev. D51 (1995) 1842-1853
We derive analytic expressions for the interaction energy between two general $U(1)$ cosmic strings as the function of their relative orientation and the ratio of the coupling constants in the model. The results are relevant to the statistic descript
Externí odkaz:
http://arxiv.org/abs/hep-ph/9405222
Publikováno v:
Phys.Lett. B332 (1994) 297-304
It is shown that for small relative angle and kinetic energy two type I $U(1)$ strings can form bound states upon collision instead of the more familiar intercommuting configuration. The velocity below which this may happen is estimated as function o
Externí odkaz:
http://arxiv.org/abs/hep-ph/9405221
Although there has been considerable interest in the nature of ancient cities, it has been difficult to identify and explore quantitative patterns in their design and amenities. In this article, we offer a model for the relationship between the size
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=core_ac_uk__::07c98b9450897faed4c4e889e2d6acd2
https://centaur.reading.ac.uk/81296/8/urban_form_infrastructure_and_spatial_organisation_in_the_roman_empire.pdf
https://centaur.reading.ac.uk/81296/8/urban_form_infrastructure_and_spatial_organisation_in_the_roman_empire.pdf
Autor:
Bettencourt, L. M. A.1,2 lmbett@lanl.gov, Lobo, J.3 gbw@santafe.edu, West, G. B.2 Jose.Lobo@asu.edu
Publikováno v:
European Physical Journal B: Condensed Matter. Jun2008, Vol. 63 Issue 3, p285-293. 9p. 1 Chart, 2 Graphs.
