CPT symmetry in a copy world?

In summary: However, in most cases, the charge would remain the same. This is because charge is tied to the electromagnetic interaction, which is a fundamental force that is thought to be conserved in all universes. In summary, in a hypothetical mirror world with reversed parity and time, the same physics laws would apply if the charge is also reversed due to CPT symmetry. However, if different physics laws are applied, the charge may remain unchanged as it is tied to the electromagnetic interaction.
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TL;DR Summary
Given a copy of our world with parity and time reversed, should charge remain the same if different physics law govern the copy world?
Say we have a copy of our world, but with the "parity" and "time" reversed. (For example, the mirror world from the novel "Alice Through the Looking Glass".)

If the "charge" is also reversed, then due to the CPT symmetry, the same physics law would apply to the mirror world, right?

If we assume that different physics law are applied in the mirror world, then does it mean that the "charge" should remain unchanged from our world?
 
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Since PT is not a symmetry you need C in addition to get a precise copy of our world ;-). Without also applying C you get another world, where the weak interaction looks different than in ours.
 
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vanhees71 said:
Since PT is not a symmetry you need C in addition to get a precise copy of our world ;-). Without also applying C you get another world, where the weak interaction looks different than in ours.
Yeah, so since the mirror world in the novel "Through the looking glass" seemed to have different physics law compared to ours, and since parity and time seems to be reversed, then charge should remain same as our world, right? :)
 
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questionner said:
Say we have a copy of our world
How does this work? Why don't we see copy-electrons pair produced in the same processes where we see real electrons pair produced?

It sounds like you want to suspend some but not all of the laws of physics and see what happens. That's fair, but you need to be very., very clear about what you are keeping and what you are throwing away.
 
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Vanadium 50 said:
How does this work? Why don't we see copy-electrons pair produced in the same processes where we see real electrons pair produced?

It sounds like you want to suspend some but not all of the laws of physics and see what happens. That's fair, but you need to be very., very clear about what you are keeping and what you are throwing away.
I was just simply thinking of a hypothetical world, like people saying the world with all CPT reversed have the same physics as our world.

Another thing I am curious about is that a magnetic dipole with only one of C or P or T reversed is different from the original one. What interaction is violated here?
 
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questionner said:
If we assume that different physics law are applied in the mirror world, then does it mean that the "charge" should remain unchanged from our world?
If you assume that, all bets are off. Anything could happen.
 

1. What is CPT symmetry in a copy world?

CPT symmetry is a fundamental principle in physics that states that the laws of physics should remain unchanged under the combined operations of charge conjugation (C), parity transformation (P), and time reversal (T). In a copy world, this means that if we were to create an exact copy of our universe and reverse the charges, mirror the spatial coordinates, and reverse the direction of time, the laws of physics should still hold true.

2. Why is CPT symmetry important in a copy world?

CPT symmetry is important because it is a fundamental aspect of our understanding of the laws of physics. It has been extensively tested and confirmed in our own universe, and if it were to be violated in a copy world, it would raise questions about the validity of our current theories and models.

3. Is CPT symmetry in a copy world a proven concept?

While CPT symmetry has been extensively tested and confirmed in our own universe, it is not a proven concept in a copy world. The existence of a copy world is purely theoretical, and until it can be proven or observed, the concept of CPT symmetry in a copy world remains a hypothesis.

4. How does CPT symmetry in a copy world relate to the concept of antimatter?

Antimatter is a type of matter that has the opposite charge of normal matter. In a copy world, the charges of particles would be reversed under CPT symmetry, meaning that what we consider to be normal matter in our universe would be considered antimatter in a copy world. This further emphasizes the importance of CPT symmetry in understanding the laws of physics in a copy world.

5. Are there any experiments or observations that support the existence of CPT symmetry in a copy world?

Currently, there are no experiments or observations that directly support the existence of CPT symmetry in a copy world. However, some theories and models, such as string theory, suggest the possibility of multiple universes or dimensions, which could potentially include a copy world. Further research and experimentation in these areas may provide evidence for the existence of CPT symmetry in a copy world.

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