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The equations of classical physics are time reversible -- unchanged when $t$ is replaced by $-t$. The Schrodinger equation in quantum mechanics is time reversible -- unchanged when $t$ is replaced by $-t$ and $i$ by $-i$ (because only $\psi \psi^*$ has physical meaning).

But the thing that is time irreversible in quantum mechanics is the collapse of the wave function upon observation. Are there alternative interpretations that do not postulate the collapse and preserve time reversibility? One such is the many-universe theory. Are there others and what are their pros and cons?

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    $\begingroup$ This is a duplicate of a previous question of yours that you appear to have deleted. This is a very bad practice and continuing it will eventually lead to a question ban. I would vote to undelete your previous post so that we can mark this one as a duplicate of it. If you just wanted to edit your post, you can do that without deleting the old one. $\endgroup$ Commented yesterday
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    $\begingroup$ As it stands your question is very broad. You are asking for a list of such interpretations and their merits, which is a long essay and in any case already covered by many articles such as the Wikipedia article on interpretations. If you had a specific question about a specific interpretation that would fit the remit of the site better. $\endgroup$ Commented yesterday
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    $\begingroup$ If a question is not getting votes to reopen it after an edit, then you need to accept that the community does not feel it is a reasonable question and move on from that. Reposting closed questions is behavior that will work badly for you. It's considered very sneaky to delete a closed question and then repost it so that will attract additional down votes. Put another way, "no" means "no" - learn to accept that. $\endgroup$ Commented 22 hours ago
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    $\begingroup$ You could try asking in the chat room as anything goes there. Though bear in mind that physicists working in QM tend to get a bit bored with questions about interpretation of QM as all interpretations predict the same observables so the question usually cannot be answered. $\endgroup$ Commented 22 hours ago
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    $\begingroup$ Reposting closed questions also shows a lack of respect for the community. $\endgroup$ Commented 21 hours ago

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