Spacetime torsion: The end of major cosmological problems?

A cosmologist has shown that an already existing extension of general relativity may eliminate major problems in gravitational physics, and answer major questions in cosmology.
The Einstein–Cartan–Sciama–Kibble (ECSK) theory of gravity naturally extends general relativity to account for the intrinsic angular momentum (spin) of elementary particles. This theory, named after Albert Einstein, Élie Cartan, Dennis …

A fascinating galaxy cluster

Astronomers have studied one of the most interesting galaxy clusters, Pandora’s cluster. Probably formed by complex and violent collisions, the unusual cluster has many features never seen before.
At least four galaxy clusters had to collide to form Abell 2744, or Pandora’s cluster. Its nickname comes from the multiple strange phenomena …

Is dark matter an illusion?

A researcher has suggested that dark matter might simply be an illusion, rather than some unknown non-baryonic matter. Assuming that antimatter has a negative gravitational charge, the “illusion” would be explained by the resulting gravitational polarization of the quantum vacuum by ordinary matter.
The need for dark matter first appeared with …

A new class of black holes?

Among all the objets in our Universe, some are much smaller than their siblings, such as dwarf stars or dwarf galaxies. Scientists now suggest dwarf black holes might exist, and that some might be forming right now.
When it comes to black holes, we usually hear about supermassive black holes, at …

Still looking for dark matter

Once more, physicists have not found particles of dark matter, this strange stuff that makes up about 83% of the matter in the Universe.
A few days ago, the XENON100 collaboration announced at a seminar in Gran Sasso National Laboratory, in Italy, that they have not detected any dark matter particles. …

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