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Physics

Questions tagged [time-travel]

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Time travel is the concept of moving between different points in time, often instigated by non-trivially topology of space-time, such as a wormhole. DO NOT USE THIS TAG for questions on changes of coordinate systems, changes of time coordinate, or topologically trivial 'twin paradox' settings.

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In the Twin Paradox, if the travelling twin, Betty, instead of returning to her brother Albert at home, continues her journey after a period of rest, why is causality not violated due to her brother, ...
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if an object or person were to travel back in time, their mass-energy would disappear from the present and reappear in the past. This would imply:A net creation of energy at the moment of ...
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I was trying to make a desmos graph that takes the spacetime worldline of let's say spaceship A (viewed from an inertial reference frame) as an input and draws its constant time/space axis (still ...
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1answer
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According to Einstein's special relativity, time passes slower for the faster object. So, let's travel in space and gradually increase the velocity to near the speed of light. And, I think we don't ...
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I've been looking into how faster-than-light travel implies time travel. I'm familiar with the simplest example to show that causality is violated with faster-than-light communication (the example I ...
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I am a physics enthusiast. I was watching a video by Professor Brian Greene on YouTube. He said that when an alien in a distant galaxy is at rest relative to Earth, he will see the present of earth. ...
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I'm currently drafting some scifi story where the protagonist is in a long timeloop and wants to figure out when the loop starts exactly based on observing some unstable phenomena, like atomic decay ...
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I'd be grateful for an explanation of post-selected teleportation (PCTCs). Please provide a step-by-step description of how the process should be performed (Alice and Bob style). Please also explain ...
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We have established that time is relative and goes slower for objects in motion and we have experimentally proven with the ISS. A thought experiment: What if the ISS was moving at much higher speeds, ...
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If causality is an axiom or a fundamental law in physics, would the existence of causality be a reason which forbids time travel? Because time travel could break causality so we see first the effect ...
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Is there anything wrong with the following argument ruling out inconsistencies with closed timelike curves?MathA solution in the context of General Relativity is a pseudo-Riemannian manifold $(M, g)$...
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The Novikov self-consistency principle prevents a paradox in which a billiard ball is sent to its past through a closed timelike curve (allowed under general relativity) such that it collides with its ...
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The Novikov self-consistency principle prevents a paradox in which a billiard ball is sent to its past through a closed timelike curve (allowed under general relativity) such that it collides with its ...
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I'm new to physicswe've had and argument in our class about:we know that present (and/or past) can and will affect future.But how do we know if the future can affect past or present?Is that even ...
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I am pretty sure the answer is going to bo "no", but I would still like to have a physicist explanation.If I can create a device that can change the probability of a positron annihilation, ...
Guillaume Chereau's user avatar

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