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

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!
 
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. Towards the end of the first lecture for the Qiskit Global Summer School 2025, Foundations of Quantum Mechanics, Olivia Lanes (Global Lead, Content and Education IBM) stated... Source: https://www.physicsforums.com/insights/quantum-entanglement-is-a-kinematic-fact-not-a-dynamical-effect/ by @RUTA
If we release an electron around a positively charged sphere, the initial state of electron is a linear combination of Hydrogen-like states. According to quantum mechanics, evolution of time would not change this initial state because the potential is time independent. However, classically we expect the electron to collide with the sphere. So, it seems that the quantum and classics predict different behaviours!

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