Undergrad Does the wave function shorten when approaching light speed?

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Objects shorten exponentially as they approach the speed of light, but this concept does not apply to the wave function, as it is not an object moving through space. The discussion raises questions about the relationship between wave functions and massless particles like photons, but the consensus is that the wave function does not experience this shortening. Additionally, reconciling quantum mechanics with relativity involves more complexities than merely adjusting the understanding of the wave function. For further insights, resources like Mark Srednicki's QFT textbook can provide deeper explanations. Overall, the wave function remains distinct from the physical effects experienced by objects with mass.
KBon
Relative to the observer, objects shorten when approaching the speed of light exponentially. Does this rule also apply to the wave function? Does this rule also apply to massless particles like Photons?

Or am I just simply forgetting something?
 
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Wave function is not an object that move in space, so the answear is: no. With photons: can you rephrase your question? It doesn't make much sense. But I guess the answear will still be no:wink:
 
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There's a lot more to reconciling quantum mechanics and relativity than just tweaking your notion of the wave function. You can get a sense of just how much more from something like the first chapter of Mark Srednicki's QFT textbook; a free publicly available draft is linked from https://web.physics.ucsb.edu/~mark/qft.html (I'm not recommending this one because it's better or worse than any other, it just happens to available free online without violating any copyrights).
 
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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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