Wormholes

Wormholes, also known as Einstein-Rosen bridges, are hypothetical entities that look like an hourglass. The particularity with this object is that it can’t be detected by any human machines, therefore we still can’t prove their existence. But some scientists want to believe in it.

Wormholes are described as sort of portals that link two separated points in spacetime that we could go through in a instant.

Problematic: In the movie Interstellar, is the wormhole conform to the hypotheses?

1) Usage of the portal in the movie:

The usage in the movie is the perfect exemple of what we think a wormhole is able to do. It is a boundary of two points in space that can be crossed.
However the astronauts reached their destination within a few seconds while we suppose we can cross it instantly. The time they spent inside it was certainly to display the special effects and to make sure we understand this is a portal.But unfortunately theories predicted Einstein-Rosen wormholes would be useless for travel because they collapse quickly. Then the movie Interstellar is wrong on this point. Moreover the physicist Kip Thorne said « But there are very strong indications that wormholes that a human could travel through are forbidden by the laws of physics. » and in the movie they travel in a wormhole so they are wrong. But the wormholes are hypothetical entities and they can’t reproduce all hypotheses to make a film since it isn’t a documentary.

Picture of a wormhole extracts from the movie Interstellar

2) Wormholes according to astrophysics :

Wormholes were first theorized in 1916
In 1935, Einstein and physicist Nathan Rosen used the theory of general relativity to elaborate one idea, suggesting the existence of "bridges" through space-time. These bridges connect two different points in space-time, theoretically creating a shortcut that could reduce travel time and distance. The shortcuts came to be called Einstein-Rosen bridges, or wormholes. Their size is of the order of 1.62E-33 cm, while we know the atom core has an order of magnitude of E-15. We talk about a scale that is near impossible to picture. To make it usable we need to find a way to make it at least to the size of a human which requires a infinite amount of energy.
Austrian physicist Ludwig Flamm realized another solution was possible. He described a "white hole," a theoretical time reversal of a black hole.

Picture of a simplified representation of a wormhole