Talk:T-symmetry

Electric Dipole Moment and Notation
The section on the electric dipole moment is difficult to understand. Why does the permanent electric dipole moment have to be proportional to the expectation value of the current, ? Or is J really the total angular momentum operator (not that it would make the dipole argument easier to understand)? Perhaps J should be defined again in the section on anti-untiarity.

Second question: Shouldn't the similarity transforms in the section on anti-unitarity really be like TxT^-1, instead of TxT? For P it doesn't matter, of course, but if T^2=-1 is does make a difference.

"Unsolved" tag deleted
I've deleted the "unsolved" tag becasue it's not considered an unsolved issue. CPT symmetry has been proven in the context of quantum field theory, and the only case where T asymmetry can appear and does not appear is the QCD theta-term, which is known as strong CP problem. This is the unsolved problem, not the one mentioned in the tag.

Definitions of "Trace Defined" Asomtopics of CTP-Symetry Theroies
Strange enough before actually experiencing first hand the nature of the malady which Heisenberg attempted to define as 'absolute uncertain; I simply had no understanding for the reasoning how this could be the case after learning of reversals of symmetry, as sited. There is an abundance of absolution and separation of concerns which I will not attempt further resolve what I do not know beyond reason and experience; nor would I want to sit in a cage with an otherwise vicious series of chaotic beyond my own control although it seems a rational conclusion one could derive. Theory and practice categorically seems to derive from Heisenberg conjecture, as noted previously. Aparently what appears to often be missing in solutions of absolution is that which is lost and becomes the obvious: 'known/unknown quanity(s)'. Just an experimental theroy. [[User:ProtoBytes|ProtoBytes ProtoBytes] 12:00, 13 October 2011 (CNT)

If all the particles (quarks) spin backwards, could we travel back wards
If all the particles (quarks) spin backwards, could we technically age backwards i.e - could a 70 year old deage to a 20 year old if suddenly all the quarks started reversing because of the T-symmetry principle? 2A00:23C7:1502:6401:C4F1:9027:5B25:5C85 (talk) 10:14, 30 August 2022 (UTC)


 * That is a tricky question when thinking about time travel.
 * Another important point is - that the time does not flow - what this theory is missing and why it is flawed.
 * See Page and Wootters (1983) for a start. Or Julian Barbour. The reality consist of set of instants. 194.111.119.48 (talk) 06:15, 6 December 2023 (UTC)