2014/07/31 by Yongwan Gim, Wontae Kim · 3 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Black Holes and Theoretical Physics #Black hole (networking) #Event horizon #Falling (accident) #Limit (mathematics) #Observer (physics) #Quantum Electrodynamics and Casimir Effect #Rest (music) #Semiclassical physics #Unruh effect #gr-qc #hep-th
paper · pdf · doi:10.1142/s0217732316500334
published in Modern Physics Letters A 31(05), 1650033 (World Scientific) · 12 pages, many improvements, version to appear in MPLA
arxiv created 2016/01/28 · arxiv updated 2016/01/29 · openalex publication_date 2016/02/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A recent calculation shows that the observed energy density in the Unruh state at the future event horizon as seen by a freely falling observer is finite if the observer is released from rest at any positive distance outside the horizon; however, it is getting larger and larger so that it is negatively divergent at the horizon in the limit that the observer starts falling from rest at the horizon, which corresponds to the infinite boost with respect to the freely falling observer at a finite distance from the horizon. In order to resolve some conflicts between the recent calculation and the conventional ones in the well-known literatures, the calculation of the free-fall energy density is revisited and some differences are pointed out.