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Both. Simply put, condensed matter physics works in a non relativistic regime. It violates Lorentz invariance because it's not a relativistic theory. Like Newton's mechanics. Those are low energy limi …

First of all you should avoid using ChatGPT as a reference about math/phys questions, a lot of the time it is incorrect or gives you answers unrelated to what you ask him. Said that, you can't renorma …

Your question is a bit misleading. Unruh radiation is not about light radiation. Is about thermal radiation. You need to have a field, for example a scalar one $\phi$. The field is full of modes. Now …

We know that mass, which is a continous parameter, generates two classes of different phenomena: the ones where $m=0$ and the ones with $m \neq 0$. When a particle has $m=0$ we have phenomena which be …

What travels faster than light is the phase (phase velocity), not the envelope of the x-ray beam. The waveform travels with the group velocity which is less than $c$. Information is encoded into the w …

Context: Studying the path integral formulation of QFT I stumbled upon a fairly simple statement: when doing loop expansions of a partition function: $$Z[\eta ; \bar{\eta}] = \int [d\psi][d\bar{\psi}] …

SPIN ORIGIN Spin is a purely relativistic property. It comes in fact from the representation theory of the Lorentz group (the relativistic symmetries group). In classical mechanics, you have represent …