High School What’s the difference between TIQM and Time Symmetric QM? (a

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TIQM (Transactional Interpretation of Quantum Mechanics) and TSQM (Time Symmetric Quantum Mechanics) both utilize retrocausality but differ fundamentally in their approaches. TIQM is characterized by its non-local nature, while TSQM claims to be local in its framework. The discussion highlights that although both interpretations exploit similar concepts to address quantum mechanics' mysteries, they are not identical. Additionally, there is interest in exploring other interpretations that incorporate retrocausality. Overall, the conversation emphasizes the complexity of these interpretations and the ongoing quest for understanding in quantum mechanics.
thenewmans
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I have a few questions about interpretations that use retrocausality. I only know of 2.

1. TIQM - Transactional Interpretation of QM by John Cramer 1986
https://en.wikipedia.org/wiki/Transactional_interpretation
2. TSQM - Time Symmetric QM by Huw Price
https://aeon.co/essays/can-retrocausality-solve-the-puzzle-of-action-at-a-distance

I have my own ideas of how these might work. But I’m still trying to figure this out. I’m hoping y’all can help me take a shortcut. So I have a few questions:

1. I assume TIQM and TSQM are similar in that they both use retrocausality. Am I assuming too much?
2. What’s the main difference between TIQM and TSQM?
3. Are there any other interpretations with retrocausality?
 
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thenewmans said:
I have a few questions about interpretations that use retrocausality. I only know of 2.

1. TIQM - Transactional Interpretation of QM by John Cramer 1986
https://en.wikipedia.org/wiki/Transactional_interpretation
2. TSQM - Time Symmetric QM by Huw Price
https://aeon.co/essays/can-retrocausality-solve-the-puzzle-of-action-at-a-distance

I have my own ideas of how these might work. But I’m still trying to figure this out. I’m hoping y’all can help me take a shortcut. So I have a few questions:

1. I assume TIQM and TSQM are similar in that they both use retrocausality. Am I assuming too much?
2. What’s the main difference between TIQM and TSQM?
3. Are there any other interpretations with retrocausality?

Here is a PF Insight I wrote on retrocausality https://www.physicsforums.com/insights/retrocausality/ . There are some other programs referenced therein.
 
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thenewmans said:
What’s the main difference between TIQM and TSQM?
Without really understand either, I see that TSQM claims to be local, whereas TIQM claims non local.
 
There is a sometime poster in PhysicsForums, @rkastner, who has written several posts about TI. I don't think that the two (TIQM and TSQM) are the same, even though they exploit a similar loophole in explaining the mysteries of quantum mechanics.
 
I'm still working my way through RUTA's insights article. Looks like no shortcuts for me. I'll add @rkastner to my reading list. Thanks!
 
Time reversal invariant Hamiltonians must satisfy ##[H,\Theta]=0## where ##\Theta## is time reversal operator. However, in some texts (for example see Many-body Quantum Theory in Condensed Matter Physics an introduction, HENRIK BRUUS and KARSTEN FLENSBERG, Corrected version: 14 January 2016, section 7.1.4) the time reversal invariant condition is introduced as ##H=H^*##. How these two conditions are identical?

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