4 citations · 6 across the 2 of their papers we have counts for
7 papers
Quantum character of black holes
Adam D. Helfer
Black holes are extreme manifestations of general relativity, so one might hope that exotic quantum effects would be amplified in their vicinities, perhaps providing clues to quant…
Quantum nature of black holes
Adam D. Helfer
I reconsider Hawking's analysis of the effects of gravitational collapse on quantum fields, taking into account interactions between the fields. The ultra-high energy vacuum fluctu…
Trans-Planckian Modes, Back-Reaction, and the Hawking Process
Adam D. Helfer
Hawking's prediction of black-hole evaporation depends on the application of known physics to fantastically high energies -- well beyond the Planck scale. Here, I show that before…
The Hamiltonians of Linear Quantum Fields: II. Classically Positive Hamiltonians
Adam D. Helfer
For linear bose field theories, I show that if a classical Hamiltonian function is strictly positive, then there is a canonical transformation making the evolution orthogonal. This…
The Hamiltonians of Linear Quantum Fields: I. Existence Theory
Adam D. Helfer
For linear scalar field theories, I characterize those classical Hamiltonian vector fields which have self-adjoint operators as their quantum counterparts. As an application, it is…
The Physics of Negative Energy Densities
Adam D. Helfer
I review some recent results showing that the physics of negative energy densities, as predicted by relativistic quantum field theories, is more complicated than has generally been…