Absolute Time vs Relative Time

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The discussion centers on the nature of time in quantum mechanics (QM), questioning whether it is absolute or relative. The interpretation of QM significantly influences the understanding of time, with various interpretations like the Transactional Interpretation and De Broglie Bohm Pilot Wave providing differing perspectives. Quantum entanglement introduces non-locality but does not directly address temporal predictions. General Relativity (GR) and thermodynamics continue to provide established descriptions of time-related phenomena. Overall, the ontology of time in QM remains a complex and debated topic, shaped by the interpretation one subscribes to.
Atheismo
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What does QM have to say on the ontology of time?

Is time absolute or relative?

What does quantum entanglement have to say on the subject?
 
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Atheismo said:
What does QM have to say on the ontology of time?

Is time absolute or relative?

What does quantum entanglement have to say on the subject?

That depends utterly on which (capital 'I') Interpretation of QM you believe in. Either that will have an explanation of its own, or GR/Thermodynamics still does the speaking for it.

EDIT: Remember that QM is the study of the 'very small' and time-like effects are already well described and confirmed experimentally by GR. See The Transactional Interpretation vs. De Broglie Bohm Pilot Wave Interpretation vs. TCI for two radically departing views on time and reality, and a third 'control'.

Entanglement (non-locality) has implications, but doesn't concern itself with predictions about time. QM is very hermetic (in the non-mathematical sense)
 
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Thread 'Two equivalent statements of time reversal symmetric Hamiltonian'

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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