Browse Physics

Differences in measurements of the expansion of the Universe may point to physics beyond the standard model of cosmology.

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 first results from the space-borne Alpha Magnetic Spectrometer confirm an unexplained excess of high-energy positrons in Earth-bound cosmic rays.

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

Invisible sheetlike structures, which might pervade space and contribute to dark matter or dark energy, could be revealed as they pass by Earth-based detectors.

A new cosmological theory tackles the description of the earliest era of the Universe, a period inaccessible by current models.

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.

Observations of the way light scatters from large astrophysical bodies provides independent confirmation of the standard model of cosmology.

Theorists predict that the matter surrounding some black holes may be hot enough for nuclear fusion, which could generate lithium and deepen the mysteries surrounding lithium in the universe.

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.

Gravitational lensing distorts maps of the cosmic microwave background, providing yet another way of probing the matter and energy content of the universe.