Time : 2022/09/15 (Thu.) 12:30
Title: Do different observers see the same physics?

Abstract:
Considering a system of particles in a gravitational field for example, in classical
mechanics, there is naturally a one-to-one correspondence between the motion observed
by a freely falling observer and the motion observed by a distant observer. However, in
quantum mechanics, a "good wave packet" whose position and velocity are relatively well
determined for one observer is not necessarily a "good wave packet" for another observer,
which means the above one-to-one correspondence no longer exists. We will argue that
such deviations can be significantly large when non-renormalizable interactions, or
interactions that becomes strong at the Planck scale, such as gravity, are taken into
account.