Browse Physics

Published June 15, 2009

Magnetism Quantum Mechanics Strongly Correlated Materials

The finding of a new duality theory could contribute to solving problems in quantum magnetism.

Published May 4, 2009

Quantum Mechanics

How screening affects the Coulomb interaction has long been considered a solved problem, but an analysis indicates there is an error in the widely used analytical approach.

Published May 4, 2009

Materials Science Nonlinear Dynamics Quantum Mechanics

Neutron scattering measurements indicate that intrinsic localized modes are found in thermal equilibrium in NaI, a simple ionic crystal.

Published April 20, 2009

Gravitation Quantum Mechanics

Finding a quantum theory of gravity remains one of the great unsolved problems in modern physics. Two papers present a quantum gravity theory that, while making different assumptions than general relativity, still reproduces Einstein’s theory in certain limits.

Published January 12, 2009

Quantum Mechanics

Quantum graphs are convenient mathematical tools for describing complex molecules and networks of quantum wires. Scientists are addressing the question: When and how fast can a wave function spread out over the entire graph?

Published November 6, 2008

Optics Quantum Mechanics

The optical equivalent of electron oscillations in periodic lattices has now been described by a fully quantum mechanical theory.

Published October 27, 2008

Quantum Mechanics

When two bulk objects are separated by a sufficiently small distance, quantum fluctuations in the electromagnetic field give rise to Casimir forces between them. Two papers explore how these forces are affected by the electrical properties of the materials.

Published August 5, 2008

Quantum Mechanics

Bell showed that quantum entanglement cannot be modeled with local hidden variables alone. Now, physicists argue that only models based exclusively on nonlocal hidden variables can reproduce all possible quantum correlations.

Published July 21, 2008

Quantum Mechanics Statistical Mechanics

Theorists show that the quantum critical states of fermions may have fractal character and predict signatures of this result in liquid ³He, a fermionic fluid.

Published July 14, 2008

Quantum Mechanics

The Dirac and Klein-Gordon equations provide a full relativistic description for particles with spin ½ and 0, respectively. A calculation now shows how to extend this description to particles, such as nuclei, with spin greater than ½.