******** CTCD/NTHU HEP Seminar ********

Speaker ：Prof. Chen-Pin Yip (NDHU)

Title ：Decoherence by black holes via holography

Time ：12:30-13:30, Thursday, 2025/9/4

Place ：R521, 5F, General Building II, Nat'l Tsing Hua Univ.

Host ： Prof. Chong-Sun Chu (NTHU)

Abstract :
We reexamine decoherence effects in quantum field theories with gravity
duals.
The thought experiment proposed in arXiv:2205.06279 (the DSW effect),
which reveals novel decoherence patterns associated with black holes, is
also manifest in the perspective of the boundary theory. In particular,
we consider a moving mirror coupled to quantum critical theories
characterized by a dynamical exponent z, that are dual to asymptotically
Lifshitz geometries. The interference experiment takes place on the
boundary, where a superposition of two spatially separated quantum
states of a mirror is maintained for a finite time before recombination.
We find that the interaction with a quantum field at finite temperature,
arising from the presence of a Lifshitz black hole, leads to a constant
decoherence rate. In contrast, for the zero-temperature case
corresponding to pure Lifshitz spacetime,
the decoherence rate vanishes in the large-time limit. Remarkably, in
this zero-temperature regime, the decoherence exhibits a power-law decay
at large time as z goes to infinity, a behavior reminiscent of the
decoherence patterns seen in extremal black holes. In addition, we
investigate the decoherence of one particle in an EPR pair constructed
holographically.