Recent Articles

Fluid Dynamics

Focus: Video—Physics of Oil Recovery

Experiments mimicking a common oil drilling technique, in which fluid is forced into an oil-filled, porous medium, have uncovered four different flow patterns. Read More »

Gravitation

Synopsis: Relativity Survives Scrutiny, Again

Two independent studies show no evidence that a fundamental symmetry in relativity, known as Lorentz invariance, breaks down. Read More »

Condensed Matter Physics

Synopsis: Bloch Theory Scratches the Surfaces

Bloch’s famous theory describing the electron states in a crystalline solid has been recast to apply to surface states as well. Read More »

Particles and Fields

Synopsis: New Constraints on Axion-Gluon Interaction Strength

An analysis of spin-precession data of atoms and neutrons sets some of the tightest limits to date on the strength of interactions between axions and gluons or nucleons. Read More »

Atomic and Molecular Physics

Viewpoint: Scattering Atoms Catch the d Wave

d-wave interactions like those thought to underlie unconventional superconductivity have been implemented in a cold-atom gas. Read More »

Magnetism

Focus: Field-Free Spin Patterns

A vortex-like magnetic spin structure inside a small disk of material is stable without an external magnetic field and might be useful for information storage or processing. Read More »

Optics

Synopsis: Photons Couple Like Cooper Pairs

A pairing of photons—similar to the pairing of electrons in superconductors—can occur when light scatters in a transparent medium.   Read More »

Fluid Dynamics

Synopsis: Magnetic Wand Directs Particles in Microfluidic Device

Researchers propose a scheme to position, focus, and sort magnetic particles in a microchannel with a magnetic field. Read More »

Atomic and Molecular Physics

Synopsis: Experiment Backs Up Bogoliubov Theory

An experiment with cold atoms confirms a 70-year-old theory predicting the fraction of a Bose gas that turns into a Bose-Einstein condensate. Read More »

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