Speaker: Salvatore Ribisi
Place: The Cloud
Date: Tues Feb 27th
Time: 9am Central.
Zoom link
https://lsu.zoom.us/j/96858252540?pwd=a0x4anVBSG5aMUgzaWFPUnI4eVRqZz09
Title: Light-cone thermodynamics
Abstract:
After a brief introduction of the previous works on Light-cone thermodynamics done by Perez and De Lorenzo, I will present the results of our last paper. Here, we explicitly express the Minkowski vacuum of a massless scalar field in terms of the particle notion associated with suitable spherical conformal killing fields. These fields are orthogonal to the light wavefronts originating from a sphere with a radius of rH in flat spacetime: a bifurcate conformal killing horizon that exhibits semiclassical features similar to those of black hole horizons and Cauchy horizons of spherically symmetric black holes. Our result highlights the quantum aspects of this analogy and extends the well-known decomposition of the Minkowski vacuum in terms of Rindler modes, which are associated with the boost Killing field normal to a pair of null planes in Minkowski spacetime (the basis of the Unruh effect). While some features of our result have been established by Kay and Wald's theorems in the 90s -- on quantum field theory in stationary spacetimes with bifurcate Killing horizons -- the added value we provide here lies in the explicit expression of the vacuum.
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