Results 71 to 80 of about 1,582 (138)

On the dynamics of cosmological phase transition during Bose–Einstein condensation of dark matter in Barrow entropy-based cosmology

European Physical Journal C: Particles and Fields
Throughout the cosmic evolution of the Universe, when the temperature of a boson gas drops below a certain threshold, the Bose–Einstein condensation phenomenon may occur.
Subhra Mondal, Amitava Choudhuri
doaj   +1 more source

Second sound in the crossover from the Bose-Einstein condensate to the Bardeen-Cooper-Schrieffer superfluid

Nature Communications, 2021
The second sound is an entropy oscillation propagating with constant pressure. Here the authors demonstrate the variation of the second sound wave in the crossover from the Bose-Einstein condensate to the Bardeen-Cooper-Schrieffer superfluid using 6Li.
Daniel K. Hoffmann, Vijay Pal Singh, Thomas Paintner, Manuel Jäger, Wolfgang Limmer, Ludwig Mathey, Johannes Hecker Denschlag   +6 more
doaj   +1 more source

Preserving Quantum Coherence in Thermal Noisy Systems Via Qubit Frequency Modulation

Advanced Quantum Technologies, Volume 9, Issue 6, June 2026.
Frequency modulation is shown to preserve quantum coherence in a thermal phase‐covariant environment only under specific noise conditions. It protects a qubit against thermal dissipation from a Lorentzian reservoir, but fails against thermal pure dephasing from an Ohmic reservoir.
Mahshid Khazaei Shadfar, Farzam Nosrati, Ali Mortezapour, Vincenzo Macri, Roberto Morandotti, Rosario Lo Franco   +5 more
wiley   +1 more source

Superflow in a toroidal Bose-Einstein condensate: an atom circuit with a tunable weak link. [PDF]

Physical Review Letters, 2010
We have created a long-lived (≈40 s) persistent current in a toroidal Bose-Einstein condensate held in an all-optical trap. A repulsive optical barrier across one side of the torus creates a tunable weak link in the condensate circuit, which can affect ...
A. Ramanathan, K. Wright, S. R. Muniz, M. Zelan, W. T. Hill, C. Lobb, K. Helmerson, W. Phillips, G. Campbell   +8 more
semanticscholar   +1 more source

Stationary states of a rotating Bose-Einstein condensate: routes to vortex nucleation. [PDF]

Physical Review Letters, 2001
Using a focused laser beam we stir a 87Rb Bose-Einstein condensate confined in a magnetic trap. We observe that the steady states of the condensate correspond to an elliptic cloud, stationary in the rotating frame.
K. Madison, F. Chevy, V. Bretin, J. Dalibard   +3 more
semanticscholar   +1 more source

The Modified Camassa–Holm Equation on the Half Line: A Riemann–Hilbert Approach

Studies in Applied Mathematics, Volume 156, Issue 6, June 2026.
ABSTRACT We consider the initial‐boundary value (IBV) problem for the modified Camassa–Holm (mCH) equation m∼t+(u∼2−u∼x2+2u∼)m∼x=0,m∼:=u∼−u∼xx+1$\tilde{m}_t+{\left((\tilde{u}^2-\tilde{u}_x^2+2\tilde{u})\tilde{m}\right)}_x = 0, \qquad \tilde{m}:=\tilde{u}-\tilde{u}_{xx}+1$ on the half‐line x≥0$x \ge 0$.
Iryna Karpenko, Dmitry Shepelsky
wiley   +1 more source

Standing waves of nonlinear Schrödinger systems with all attractive forces

Journal of the London Mathematical Society, Volume 113, Issue 6, June 2026.
Abstract Since the pioneering work of Lin and Wei on nonlinear Schrödinger systems of n$n$ components with interaction forces aij$a_{ij}$ between the i$i$‐th and j$j$‐th components for 1⩽i,j⩽n$1\leqslant i,j\leqslant n$, there have been numerous further developments in many directions. However, even in the simplest case where all interaction forces are
Jaeyoung Byeon
wiley   +1 more source

Derivation of the Gross-Pitaevskii equation for the dynamics of Bose-Einstein condensate [PDF]

, 2004
Consider a system of N bosons in three dimensions interacting via a repulsive short range pair potential N 2 V (N(xi − xj)), where x = (x1, . . ., xN) denotes the positions of the particles. Let HN denote the Hamiltonian of the system and let ψN,t be the
L. Erdős, B. Schlein, H. Yau
semanticscholar   +1 more source

Strong Plasmon–Exciton Coupling Tuned by Corner Etching of Gold Nanocubes and Nanotriangles

Advanced Optical Materials, Volume 14, Issue 18, 15 May 2026.
Systematic etching of gold nanocubes (AuNCs) and nanotriangles (AuNTs) reveals how nanoparticle morphology governs plasmon–exciton strong coupling. While rounding the corners of AuNCs weakens their coupling, triangular geometries robustly preserve deep strong coupling.
Jiyeon Lee, Seoyoung Hwang, Yoon‐Min Lee, Jeong‐Eun Park, Sangwoon Yoon   +4 more
wiley   +1 more source

Collective modes of a photon Bose–Einstein condensate with thermo-optic interaction

New Journal of Physics, 2019
Although for photon Bose–Einstein condensates the main mechanism of the observed photon–photon interaction has already been identified to be of a thermo-optic nature, its influence on the condensate dynamics is still unknown.
Enrico Stein, Frank Vewinger, Axel Pelster   +2 more
doaj   +1 more source