Understanding Spin Reversal and CPT Invariance in Physics | Explained

In summary, time reversal of spin is a hypothetical process in quantum mechanics that involves reversing the direction of an object's spin, as if time were moving backwards. It is important in understanding the fundamental nature of particles and has practical applications in technology. While it has not been observed in experiments, it has significant implications for our understanding of the universe and is related to other concepts in physics.
  • #1
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Hi all,

I was just pondering why spin is odd under time reversal. I am trying to get my head around CPT invariance and am failing to find good material online.

Thanks
 
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  • #2
Here, the analogy to a classical rotating object is fine: After T, it spins in the other direction, therefore the spin gets a minus sign.
 
  • #3
Ah ok thanks. Turns out the analogy of hitting the rewind button on a video of the particles motion is more useful than Id thought.
 

FAQ: Understanding Spin Reversal and CPT Invariance in Physics | Explained

What is time reversal of spin?

Time reversal of spin is a concept in quantum mechanics that refers to a hypothetical process in which the direction of an object's spin is reversed, as if time were moving backwards.

Why is time reversal of spin important?

Time reversal of spin plays a crucial role in understanding the fundamental nature of particles and their interactions. It also has practical applications in technologies such as magnetic storage and quantum computing.

Can time reversal of spin actually occur?

While time reversal of spin is a theoretical concept, it has not yet been observed in experiments. However, some processes in physics are known to be time-reversal symmetric, meaning they would not be affected if time were reversed.

What are the potential implications of time reversal of spin?

If time reversal of spin were possible, it could have significant implications for our understanding of the universe. It could also potentially lead to advancements in technologies such as quantum computing and communication.

How is time reversal of spin related to other concepts in physics?

Time reversal of spin is closely related to other concepts in quantum mechanics, such as time symmetry and spin flip. It is also connected to other fundamental principles in physics, including the conservation of angular momentum and the arrow of time.

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