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1.
Grammaticos B. Otha Y. Ramani A. Satsuma J. Tamizhmani K. M. 《Letters in Mathematical Physics》1997,39(2):179-186
We present Miura transformations for the continuous and several discrete Painlev\'e I equations. In the case of the continuous PI, we use the Hamiltonian formulation of the Painlev\'e equations and show that there exists a Miura transformation between PI and the binomial, second degree, equation of Cosgrove SDV. In the case of the discrete PI's we obtain two different kinds of Miuras. One kind relates a d-PI to some other d-PI while the other leads to discrete four-point equations which are the discrete analogs of the derivative of Cosgrove's equation SDV. 相似文献
2.
We introduce the Schlesinger transformations for the Gambier, linearisable, equation and by combining the former construct the contiguity relations of the solutions of the latter. We extend the approach to the discrete domain obtaining thus the Schlesinger transformations and the contiguity relations of the solutions of the Gambier mapping. In all cases the resulting contiguity relation is a linearisable equation, involving free functions, and which can be related to the generic Gambier mapping. 相似文献
3.
A systematic procedure for calculating semiclassical expansions of physically interesting quantities is presented. The method is based on the Wigner transform of operators. It is applied specifically to the case of fermions governed by a one-body Hamiltonian. Expansions up to fourth order in ? of the density matrix for various spin-independent potentials are derived. Expressions of the kinetic energy density in terms of the matter density are given, which are of particular interest for nuclear structure calculations. 相似文献
4.
Using the Painlevé criterion three integrable cases are identified for the Hénon-Heiles system. A new integral of motion, unknown to date is presented for the third case. 相似文献
5.
K. M. Tamizhmani A. Ramani B. Grammaticos Y. Ohta 《Letters in Mathematical Physics》1996,38(3):289-296
We derive the form of the Miura transformation of the discrete Pv equation and show that it is indeed an auto-Bäcklund transformation, i.e. it relates the discrete Pv to itself. Using this auto-Bäcklund, we obtain the Schlesinger transformations of discrete Pv which relate the solution for one set of the parameters of the equation to that of another set of neighbouring parameters. Finally, we obtain particular solutions of the discrete Pv (i.e. solutions that exist only for some specific values of the parameters). These solutions are of two types: solutions involving the confluent hypergeometric function (on codimension-one submanifold of parameters) and rational solutions (on codimension-two submanifold of parameters). 相似文献
6.
7.
We present a model which aims at describing the morphology of colonies of Proteus mirabilis and Bacillus subtilis. Our model is based on a cellular automaton which is obtained by the adequate discretisation of a diffusion-like equation, describing the migration of the bacteria, to which we have added rules simulating the consolidation process. Our basic assumption, following the findings of the group of Chuo University, is that the migration and consolidation processes are controlled by the local density of the bacteria. We show that it is possible within our model to reproduce the morphological diagrams of both bacteria species. Moreover, we model some detailed experiments done by the Chuo University group, obtaining a fine agreement. 相似文献
8.
We study classes of mappings which do not belong to the QRT family. We obtain several integrable non-autonomous forms of these mappings extending previous results where only linearisable cases were found. Using our recently introduced method of singularity confinement with full deautonomisation, we analyse a mapping which, while non-integrable, does possess confined singularities and show that our method makes it possible to obtain the exact value of its algebraic entropy. 相似文献
9.
Teruhisa Tsuda Basil Grammaticos Alfred Ramani Tomoyuki Takenawa 《Letters in Mathematical Physics》2007,82(1):39-49
We analyse a class of mappings which by construction do not belong to the QRT family. We show that some of the members of
this class have invariants of high degree. A new linearisable mapping is also identified. A mapping which possesses confined
singularities while having nonzero algebraic entropy is presented. Its dynamics are studied in detail and shown to be related
intimately to the Fibonacci recurrence.
相似文献
10.
K. M. Tamizhmani A. Ramani T. Tamizhmani B. Grammaticos 《Journal of Computational and Applied Mathematics》2003,160(1-2):307-313
We present results on special solutions of discrete Painlevé equations. These solutions exist only when one constraint among the parameters of the equation is satisfied and are obtained through the solutions of linear second-order (discrete) equations. These linear equations define the discrete analogues of special functions. 相似文献