In lower level classes I start with a simpler question. If a mirror reflects an image from left to right, why doesn’t it reflect the image from top to bottom? Of course the researchers know the answer to that question. It starts with a false assumption and omits the vital facts.
On a higher level something of the same type occurs in the ways we ask questions about the passage of time and time reversal. CERN has done work on CPT reversal which is charge, parity, and time. An effort is made to pose the research questions in such a way that they do not contain false assumptions and ignore the leading clues.
Time reversal does occur to the extent that it can be measured and studied. The present question is about the potential or lack or potential to go the next step in time reversal.
Can Engineers Build A Mirror That Reflects Time Backward?
The answer to the question in the text is known, cf. https://www.youtube.com/watch?v=msN87y-iEx0
The answer to the main question is, No. And the reason is that the mirror is a space-like surface, in spacetime-it's somewhere. So time doesn't change direction, for the observer that gets reflected.
CPT is a symmetry of subatomic physics, that's why ``CPT reversal'' doesn't make sense. And CP violation, which implies time reversal violation doesn't mean that time reversal occurs-it means that certain processes, that would be related in a certain way, under exchange of particles for antiparticles, in fact, are not.
Not a mirror, but engines works as if there were no time, but a frequency(?)
In material physics, the concepts 'configurational forces' and 'material memory' were introduced by Gurtin and Poiduglio, not so long ago. (It relates somewhat to Noether's theorem in variational calculus.) Those are really fascinating ideas, but not so easy to cast into formula.
Applications are;
shape memory alloys
and (as I think), general interactions on boundaries with the conjugated forces implicitely obtained in variational calculus
and (evolutionary) growth by either input from outside configuration or due to inside memory.
Results from CERN with neutral Kaons and Anti Kaons can be interpreted based on the constituent quarks to mean that a time reversal has occurred in the conversion of a quark to an anti quark. Skew symmetry in the detected fragmentary particles can be made symmetric by inserting a time delay in the distribution.
In the present question I include all sorts of reflecting fields in the class of possible mirrors, not just the familiar optical device.
My intent in this thread is to ask if possible new science is overlooked by the occurrence of assumptions in the way we ask questions, also connected to the choices we make about which data is relevant.
https://en.wikipedia.org/wiki/Time_reversal_signal_processing
The link shows that other researchers are working with various aspects of time reversal.
"CPT is a symmetry of subatomic physics" for most experiments, but exceptions occur, for example by left and right handedness in rare cases which connect the fraternity question to Richard Feynman's 3 minute answer about what a mirror actually does.
Science progresses by drilling down to what actually happens in nature, overlooking the incompleteness of theories and data.
In order for time to be engineered it should have matter properties. According to a unified fielld hypothesis which is equivalent to a minimum contradictions point of view there are many kinds of time flow rate; positive negative [gravitational- (g) and (anti-g)] positive imaginary negative imaginary [electromagnetic- (em) and (anti-em)] time flow rate. A specific case of (em) time flow rate iis the magnetic one. In this case as mirror can be used a superconductor. However there are other factors affecting the engineering desired . Please see in my contributions (patens)..
Consider the two step nuclear reaction
48Cd106(e-,e+)46Pd106
requiring 24 minutes on average in which the unstable Silver isotope intermediate 47Ag106 is not shown.
The positron velocity is a scatter pattern, not a reflection of the electron velocity, but the positron does represent a time reversal of the electron. The cadmium mirror has been altered by the time reflection and become a palladium mirror.
As Athanassios Nassikas pointed out researchers must attach time to a material object in order to engineer a time altering device.
Maybe a new rule can be proposed. Every action of time reversal produces a compensating reaction of some type in the active system. Time does not pass either forward or backward unless attached to a material object that has rest mass. The weak nuclear force can moderate a time reversal.
For many years CERN has made anti protons. The older precess is with copper target.
29Cu63(2e-p+,p-)29Cu63
29Cu65(2e-p+,p-)29Cu65
But Zinc and Gallium can also be made.
Generally In most of these reactions the compensating reaction is the disappearance of an electron instead of the appearance of zinc and gallium, although the process can run at lower efficiency without the several hundred KeV electric current. The anti proton represents time reversal.
A newer process bombards tungsten with high energy electrons.
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