#Wormholes #TimeTravel

What is a Wormhole

A wormhole as known as Einstein–Rosen bridge is a speculative structure linking disparate points in space-time.
or can be describe as a theoretical passage through space-time that could create a shortcut for long journeys across the universe.

A wormhole could connect extremely long distances such as a billion light years or more, short distances such as a few meters, different universes, or different points in time.

History

Wormholes were first theorized in 1916, though that wasn't what they were called at the time.

In 1935, Einstein and physicist Nathan Rosen used the theory of general relativity to elaborate on the idea, proposing the existence of "bridges" through space-time.
A bridge connects two different points in space-time, theoretically creating a shortcut that could reduce travel time and distance.

Einstein's theory of general relativity mathematically predicts the existence of wormholes, but none have been discovered to date.

Would time travel possible with wormhole ?.

Wormholes may not only connect two separate regions within the universe, they could also connect two different universes.
Similarly, some scientists have conjectured that if one mouth of a wormhole is moved in a specific manner, it could allow for time travel.

As it said, wormholes is a theorized concept up to the day. However, even it exist there are some practical limitation when it comes to time traveling.

first problem will be the size.
Primordial wormholes are predicted to exist of the size of Planck length, about 10^-33 centimeters.

Second problem will be the instability of the wormhole.
The predicted wormhole could be unstable and collapse quickly. However, some suggests exotic matter - a negative mass could allow to stabilize and keep wormhole unchanged.
negative mass is not anti-matter, it's a region where the energy of the universe is less than that of ordinary vacuum.
Again it's not clear whether such matter exists in the universe.

Stephen Hawking conjectured that while wormholes might be created, they cannot be used for time travel.
Even with exotic matter stabilizing the wormhole against its own instabilities, he argued, inserting a particle into it will destabilize it quickly enough to prevent its use.
This is known as the Chronology Protection Conjecture.

For a moment let's forget about wormhole and focus only on time traveling.

Even without a wormhole, time traveling having it's own problems.
For example "the grandfather paradox".  
Imagine you are going back into the past and killed your grandfather before your father was born, Then your father will not exist, then you will not exist.
Then who killed your grandfather ?

In quantum physics, facts are theorized years and decades before they found in reality.
wormhole and time travel could follow the similar way. May be one day humanity will explore them and time travel could make possible.


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