Results 31 to 40 of about 129,686 (122)

A non-linear Oscillator with quasi-Harmonic behaviour: two- and $n$-dimensional Oscillators

, 2004
A nonlinear two-dimensional system is studied by making use of both the Lagrangian and the Hamiltonian formalisms. The present model is obtained as a two-dimensional version of a one-dimensional oscillator previously studied at the classical and also at ...
Ballesteros A, Bessis N, Bose S K, Cariñena J F, Cariñnena J F, De R, Evans N W, Grosche C, Grosche C, Grosche C, Higgs P W, José F Cariñena, Kalnins E G, Kalnins E G, Kaushal R S, Lakshmanan M, Lakshmanan M, Leemon H I, Lévy-Leblond J M, Manuel F Rañada, Mariano Santander, Mathews P M, Mathews P M, Mitra A K, Murugaian Senthilvelan, Nishijima K, Perelomov A M, Rauch-Wojciechowski S, Ravoson V, Rañada M F, Rañada M F, Rañada M F, Sarlet W, Velo G   +33 more
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Multi-band Eilenberger theory of superconductivity: Systematic low-energy projection

, 2016
We propose the general multi-band quasiclassical Eilenberger theory of superconductivity to describe quasiparticle excitations in inhomogeneous systems.
Nagai, Yuki, Nakamura, Hiroki
core   +1 more source

Quantum computation of SU(2) lattice gauge theory with continuous variables

Journal of High Energy Physics
We present a quantum computational framework for pure SU(2) lattice gauge theory, using continuous variables instead of discrete qubits to represent the infinite-dimensional Hilbert space of the gauge fields.
Victor Ale, Nora M. Bauer, Raghav G. Jha, Felix Ringer, George Siopsis   +4 more
doaj   +1 more source

A new proof of the higher-order superintegrability of a noncentral oscillator with inversely quadratic nonlinearities

, 2010
The superintegrability of a rational harmonic oscillator (non-central harmonic oscillator with rational ratio of frequencies) with non-linear "centrifugal" terms is studied.
Rañada, Manuel F., Rodríguez, Miguel A., Santander, Mariano   +2 more
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Spread complexity for the planar limit of holography

Journal of High Energy Physics
Complexity is a fundamental characteristic of states within a quantum system. Its use is however mostly limited to bosonic systems, inhibiting its present applicability to supersymmetric theories.
Rathindra Nath Das, Saskia Demulder, Johanna Erdmenger, Christian Northe   +3 more
doaj   +1 more source

Unfolding of nilpotent equilibria of degree 4 in Hamiltonian systems with 2 degrees of freedom

, 2017
We consider Hamiltonian systems of two degrees of freedome having a nilpotent equilibrium point with only one eigenvector. We provide the universal unfolding of such equilibrium, provided a non-degeneracy condition holds. We show that the only co-dimension 1 bifurcations that happen in the unfolding are of two types: the normally hyperbolic or elliptic
openaire   +2 more sources

Charge degrees in the quarter-filled checkerboard lattice

, 2007
For a systematic study of charge degrees of freedom in lattices with geometric frustration, we consider spinless fermions on the checkerboard lattice with nearest-neighbor hopping $t$ and nearest-neighbor repulsion $V$ at quarter-filling.
Anderson, Diep, E. Runge, F. Pollmann, Fradkin, Fulde, Hermele, J.J. Betouras, P. Fulde, Pollmann, Polyakov, Rokshar, Runge   +12 more
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Semiclassical form factor for spectral and matrix element fluctuations of multi-dimensional chaotic systems [PDF]

, 2005
We present a semiclassical calculation of the generalized form factor which characterizes the fluctuations of matrix elements of the quantum operators in the eigenbasis of the Hamiltonian of a chaotic system.
A. I. Snirelman, B. Mehlig, Dominique Spehner, F. Haake, H.-J. Stöckmann, K. Richter, Klaus Richter, M. C. Gutzwiller, M. Sieber, Marko Turek, P. Gaspard, Sebastian Müller, W. Parry   +12 more
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A semiclassical Egorov theorem and quantum ergodicity for matrix valued operators

, 2002
We study the semiclassical time evolution of observables given by matrix valued pseudodifferential operators and construct a decomposition of the Hilbert space $L^2(\rz^d)\otimes\kz^n$ into a finite number of almost invariant subspaces.
Abteilung Theoretische Physik, Jens Bolte, Rainer Glaser   +2 more
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Holographic renormalization as a canonical transformation [PDF]

, 2010
The gauge/string dualities have drawn attention to a class of variational problems on a boundary at infinity, which are not well defined unless a certain boundary term is added to the classical action. In the context of supergravity in asymptotically AdS
C Imbimbo, D Martelli, DS Mansi, E Witten, GW Gibbons, I Papadimitriou, Ioannis Papadimitriou, IR Klebanov, J Boer de, J Boer de, J Brown, J Lee, J Polchinski, JB Hartle, K Skenderis, K Skenderis, LF Alday, M Bianchi, M Carreau, M Henningson, M Reed, N Drukker, N Seiberg, P Breitenlohner, P Kraus, R Emparan, R Olea, RL Arnowitt, RR Penrose, S Haro de, S-J Rey, V Balasubramanian   +31 more
core   +2 more sources