Thread:Nra 'Vadumee/@comment-4844180-20130210231303/@comment-5135903-20130319162913

It's the explosion that prevents time travel to the past as the radiation increases exponentially until it overwhelms whatever is being used to make the CTC (closed timelike curve - the situation that comes about as a result of time travel to the past becoming possible).

And yes - you're right - Visser radiation is very fun. Just get a wormhole and bring one end up close to the speed of light (then slow it down again) so that there is a time difference and the wormholes can be used for time travel. Then bring the two wormhole mouths close together and BOOM! A nice, compact, doomsday device that could sterilise a whole solar system!

Of course, Visser radiation does not violate the first law of thermodynamics (energy cannot be created or destroyed) as the energy of the explosion never exceeds the total mass-energy of the wormhole.