# Tag Info

6

Two basic misunderstandings here: 1) under time reversal the velocity changes sign but not the acceleration or the force, which remains attractive, and 2) symmetry of the laws does not imply that a particular situation is symmetrical, only that the transformed situation (which may be different) is also a valid solution of the laws. Which it is - there is no ...

3

I would advise you to read carefully this link. As a summary: 1) CPT invariance is an experimental observation, that means all data fitted by the standard model of particle physics have CPT invariance. Thus at the moment it is a law, i.e.axiomatic, as much as for classical gravitation Newtons law is observational and axiomatic. 2) It has been shown that ...

1

This page is useful: We are left with the combination of all three, CPT, a profound symmetry consistent with all known experimental observations. On the theoretical side, CPT invariance has received a great deal of attention. Georg Ludens, Wolfgang Pauli and Julian Schwinger independently showed that invariance under Lorentz transformations implies ...

1

The article you are quoting is asking for a test of Charge conjugation, Parity transformation and Time reversal (CPT) invariance at high energies at the LHC and presumes that violations of this will be the signal for the sought for black holes of large extra dimensions. This violation is argued on the lines I am arguing against, below, and certainly is ...

1

CPT symmetry (described as a dynamical symmetry) means that a dynamical evolution$s=s(t)$ is mapped into another possible dynamical evolution $s'=s'(t)$ if you transform under CPT every single state $s'(t) := CPTs(-t)$ connected by the initial dynamical evolution (reversing also the chronological order due to the presence of $T$). In other words, $s'$ ...

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