Turbulence on the Galactic Scales From the ocean’s rolling swells to the bumpy ride of a jetliner, turbulence is everywhere. It breaks large waves into smaller ones, cascading energy across scales. It is ubitquitous throughout our Galaxy and the broader Universe, shaping the behavior of plasma, stars, and magnetic fields. Yet despite its ubiquity, turbulence remains one of the greatest unsolved problems in physics. Now, by developing the world’s largest-ever simulations of magnetized turbulence, an international team of scientists has measured —…

An international team of researchers, including the Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), has used a mismatch between elementary particles and gamma rays from NGC 1068 to propose a new route by which neutrinos can be produced. Antarctic ice has eyes that can see elementary particles called neutrinos, and what they’ve observed is puzzling scientists: a remarkably strong neutrino signal accompanied by a surprisingly weak gamma ray emission in the galaxy NGC 1068,…

Can we do away with the troublesome singularity at the heart of black holes? A new paper in JCAP reimagines these extreme objects in light of current knowledge. “Hic sunt leones,” remarks Stefano Liberati, one of the authors of the paper and director of IFPU. The phrase refers to the hypothetical singularity predicted at the center of standard black holes — those described by solutions to Einstein’s field equations. To understand what this means, a brief historical recap is helpful….

The XRISM science team, including members of Nagoya University, has explained how galaxy clusters maintain their heat despite emitting X-rays, which typically have a cooling effect on the hot gas. By observation of the Centaurus cluster of galaxies, the XRISM team discovered the existence of a fast-moving, high-temperature gas flow in the center of the cluster. Their findings, published by Nature, may solve the ‘cooling flow problem’, explaining why clusters of galaxies look like they do. Galaxy clusters are made…