Gun with a tachyon bullet paradox

In summary, the conversation discusses the possibility of a paradox if a gun with tachyon bullets were to be fired, as they could potentially go back in time and kill the shooter before the gun was even fired. However, the existence of tachyons has not been proven yet and there are already known paradoxes in relativity if the speed of light is exceeded. The concept of a closed universe may also have limits in this scenario.
  • #1
amorphos_b
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Gun with a tachyon bullet paradox

if you had a device akin to some kind of ‘gun’, which created tachyons and the fired them, perhaps in a beam or some kind of ‘packet’, when they go faster than the speed of light would go back in time. Lets say the ‘bullet’ or beam, went out into the universe and due to the curvature of space, it would eventually arrive at its original point, but before it was launched or even created?

Having no mass the tachyon bullet or beam would not kill you? Although light has no mass but a laser could. if we could go back in time and fire a gun at ourselves, it would kill us before we fired the gun!

Is there an upper limit to time and speed, which would stop such things occurring, and does the closed universe model have limits?

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  • #2
If there exist tachyon, which go faster than light, what you say would make a paradox as you expect. But we have not found tachyon yet.
 
  • #3
There are definitely real paradoxes in relativity if you can exceed the speed of light. The "tachyonic anti-telephone" is a standard one, and doesn't require a closed universe. That it doesn't make sense may be a reason why we've never seen any evidence of it.
 
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1. What is a "Gun with a tachyon bullet paradox"?

A "Gun with a tachyon bullet paradox" is a thought experiment that explores the implications of using a gun that shoots tachyon particles, which are hypothetical particles that travel faster than the speed of light. This paradox raises questions about the nature of causality and the possibility of time travel.

2. How does the paradox work?

The paradox goes as follows: Suppose you shoot a tachyon bullet at yourself in the past. If the bullet travels faster than the speed of light, it would arrive at its destination before it was even fired. This creates a contradiction, as the bullet would have to exist before it was created, violating the principle of causality.

3. Is the paradox possible in real life?

No, the paradox is not possible in real life. Tachyon particles are purely theoretical and have not been observed or proven to exist. Additionally, the laws of physics, specifically the theory of relativity, do not allow for anything to travel faster than the speed of light.

4. What are the implications of this paradox?

The paradox raises questions about the nature of time and causality. It challenges our understanding of cause and effect and the possibility of time travel. It also highlights the limitations of our current understanding of physics and the need for further exploration and research.

5. Can this paradox be resolved?

There are different theories and interpretations that attempt to resolve this paradox, such as the Novikov self-consistency principle and the block universe theory. However, since tachyon particles are purely hypothetical, it is ultimately a philosophical and theoretical debate with no clear resolution.

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