cosmology

New gravitational-lensing study hints at problems for dark matter models

Enlarge / The massive galaxy cluster MACSJ 1206. Embedded within the cluster are the distorted images of distant background galaxies, seen as arcs and smeared features. NASA, ESA, G. Caminha, M. Meneghetti, P. Natarajan, and the CLASH team. While the idea of dark matter was originally proposed to explain the structure of galaxies, one of …

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Physicists identify unique signature to confirm quark-gluon plasma in universe

Computer simulation of a merger between two dense neutron stars. After the merger, a phase transition from ordinary hadronic matter (red-yellow) to quark matter (green) takes place. In the first fractions of a second of our universe’s existence, the energy density was so incredibly high that there were no protons and neutrons, just a hot …

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