Title: [NTU-NCTS String Seminar] Do different observers see the same physics?
Speaker: Prof. Hikaru Kawai (NTU)
Time: Sep. 30, 2022 (Fri) 14:30-15:30
Venue: Rm. 815, Dept. of Physics, NTU

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
become strong at the Planck scale, such as gravity, are taken into
account.