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 …

A pencil, a chessboard, and the structure of spacetime

Space and time form a boundless continuum, which is curved by massive objects. But what does the fabric of spacetime look like? In general relativity, it is smooth and continuous. Two researchers now claim that space could be divided into discrete locations, and thereby explain the peculiar intrinsic angular momentum …

Einstein was right, again.

Einstein’s general relativity is probably one of the most successful theories in modern physics. So far, it has passed every observational and experimental test. Now, two more predictions of Einstein’s theory have been confirmed.
The Gravity Probe B (GP-B) experiment used four ultra-precise gyroscopes to measure two aspects of Einstein’s theory …

What if spacetime is timeless?

Time is everywhere in our lives, and its concept is deeply rooted in our existence. You know how old you are, how long a day is, or how long it will take you to go from one place to another. Time, in our everyday life is simply the way we …

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