### Does this equation mean anything to you?

Posted:

**Fri Jul 05, 2013 3:25 pm**$$A(t)=e^{+iHt/\hbar}Ae^{-iHt/\hbar}$$

Srednicki begins his textbook on QFT by a handful of equations ("In order to prepare for QFT, you should recognize these:"). All of them I grasp but that one.

Obviously it smells like QM, but I've never seen that exact equation, whatever the A and H mean. Anyway it seems to reduce to just $$A(t)=A$$, which is even more confusing.

So, anyone recognize something familiar in that equation? Thanks in advance.

PS: I'm pretty sure the answer is so simple as to mark me "noobie" up to the thousand and first generation...

Srednicki begins his textbook on QFT by a handful of equations ("In order to prepare for QFT, you should recognize these:"). All of them I grasp but that one.

Obviously it smells like QM, but I've never seen that exact equation, whatever the A and H mean. Anyway it seems to reduce to just $$A(t)=A$$, which is even more confusing.

So, anyone recognize something familiar in that equation? Thanks in advance.

PS: I'm pretty sure the answer is so simple as to mark me "noobie" up to the thousand and first generation...