Traversable wormholes… without exotic matter

According to string theory, hypothetical shortcuts through spacetime called wormholes, might well exist in our Universe.
For those of you who wouldn’t be Stargate fans, wormholes would be “tunnels” between two different locations in the Universe (they could also allow to travel in time, or to parallel universes). Basically, while it …

Quantum nature of space challenged by observations

New observations have shown that the quantum structure of space, if there is any, is at much smaller scales than predicted.
In Einstein’s theory of relativity, space is a smooth, continuous fabric. In quantum theory, there is an inherent discreteness present in physics. In an attempt to reconcile the two theories, …

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 …

Cosmological anomaly in the distant Universe?

Researchers have found that the Universe appears to be clumpier than predicted. This clumpiness, if not due to systematics, might be evidence that the standard model of cosmology needs to be rewritten.
Imagine yourself leaving Earth and looking at it as you are going further and further. You would first see …

Classical gravity proven wrong?

In the early 1980’s, Mordehai Milgrom proposed that Newton’s law of gravity could be modified as a replacement for dark matter. Three researchers now claim that gravity in the regime of extremely small accelerations fail, and that they have proven it.
Modified Newtonian Dynamics (MOND) were proposed to explain the galaxy …

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