No, physics is not scale invariant in general. Scale invariance refers to a property of a physical theory or system where the behavior remains the same under a change in scale, meaning that if you rescale the system (e.g., increase or decrease its size or energy), the physical laws and phenomena remain unchanged.
While there are certain cases in physics where scale invariance appears, such as in some specific quantum field theories or certain phenomena at critical points in phase transitions, it is not a fundamental property of the entire field of physics. In most cases, physical laws and phenomena depend on the scale or energy involved.
For example, in classical mechanics, the equations of motion are not scale invariant. If you change the scale of a system, the forces, velocities, and accelerations will be affected accordingly. Similarly, in quantum mechanics, the behavior of particles is influenced by their energy levels, which can lead to different outcomes at different scales.
It's important to note that the presence or absence of scale invariance depends on the specific context and the physical theory being considered. Different areas of physics may exhibit different degrees of scale invariance, and it is an active area of research to study the symmetries and scaling properties of various physical systems.