Browse Physics

According to a new model, galaxies may contain disks made of a specific type of dark matter that can interact more strongly than most dark matter.

The IceCube neutrino telescope reports its most extensive search for neutrinos produced by dark matter annihilations in the Sun.

Three major drawbacks to the ΛCDM dark matter model of the universe may be ameliorated if a proposed particle couples to dark matter and to neutrinos.

Changes in the diffusion constant of cosmic rays due to self-induced turbulence may explain unexpected features in the cosmic-ray spectrum.

A new analysis shows that it is possible to look for dark-matter particles with mass far below 1 giga-electron-volt by using atomic ionization.

The dominance of matter over antimatter is further extended with a balloon experiment ruling out the presence of antihelium in cosmic rays at the lowest level to date.

The breaking of charge-parity symmetry at lower temperatures than expected in the initial stages of the big bang could explain the abundance of matter over antimatter in the universe.

The observation of nearby galaxies provides new and stronger limits on dark matter.

A satellite currently hunting for planets around distant stars could potentially spot black holes that some theories take for the missing dark matter.

Smallish black holes left behind from the early universe might cause detectible vibrations as they pass through the sun or other stars.

Cosmic microwave background data have been combed for evidence of bubble universe collisions that might signal the existence of eternal inflation.

The idea that the observed expansion of the universe is related to our unique vantage point—as opposed to dark energy—seems to be inconsistent with telescope data.

The spatial distribution of dark matter around different types of galaxies can be explained if its particles scatter one another, theorist suggest, but only if the interaction has a finite range.

The IceCube neutrino detector buried in the Antarctic ice reports that high-energy neutrinos, expected from gamma-ray bursts, have yet to be observed.

A hypothetical particle might explain both the existence of dark matter and the prevalence of matter over antimatter.

How do gravitational singularities avoid being trapped by event horizons?

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.

Where do cosmic magnetic fields come from?

Refining a cosmic clock gives a more accurate reading of the age of our galaxy.