Browse Physics

New data from the PAMELA satellite on the abundance of antiprotons in cosmic rays still leave the door open for dark matter theories, as well as other explanations.

Searches for new sources of CP violation are a staple of high-energy physics; a recent result presents an effect that could be a sign of new physics beyond the standard model.

String dualities are exploited to find a quantum phase transition in two spatial dimensions with non-mean-field exponents.

A comparison between the density in surrounding galaxies today and a few billion years ago provides a new upper bound on neutrino mass.

Preliminary measurements of particle collisions at 7 TeV get a handle on background events at this unprecedented energy.

Theorists gain insight into how the quark-gluon plasma distinguishes left from right.

Circular motion of a parton generates radiation patterns similar to those of synchroton radiation in electromagnetism.

New calculation of quark matter properties tells us what an exotic quark-neutron star might look like.

A new calculation of stellar core-collapse explosions that includes all three neutrino flavors shows unusual spectral patterns that will be important in understanding signals from future galactic supernovae.

Theorists predict a form of Cherenkov radiation produced by quarks in the quark-gluon plasma.

An effective field theory on a lattice is applied successfully to nuclei as large as carbon-12.

Theories of dark matter interacting with a light force carrier, proposed to explain the excess of high-energy positrons in the cosmic rays, turn out to have problems.

The race for realizing Majorana fermions—elusive particles that act as their own antiparticles—heats up, but we still await ideal materials to work with.

Third-order corrections to the interquark potential within quantum chromodynamics are computed for the first time.

A model in which the dark matter relic density was inherited from the lepton asymmetry in the early universe can result in lepton-favoring dark matter annihilations today, which may explain recent anomalous cosmic-ray positron observations.

New measurements with the Fermi Large Area Telescope extend our knowledge of the extragalactic diffuse gamma-ray background and may help resolve the question of its origins.

Cascades created by cosmic rays interacting with the atmosphere provide clues about the mass composition of ultrahigh-energy cosmic rays.

The two experimental collaborations at the Fermilab Tevatron accelerator have published first results of searches for the Higgs boson, excluding parts of the otherwise allowed mass range.

A microscopic picture could explain puzzling data from RHIC.

A recent theory of high-energy bottom quark jet quenching in nuclear collisions accentuates the novelty of heavy quark jet dynamics in strongly coupled quark-gluon plasmas discovered at the Relativistic Heavy Ion Collider.