52,009 research outputs found
Fully QED/relativistic theory of light pressure on free electrons by isotropic radiation
A relativistic/QED theory of light pressure on electrons by an isotropic, in
particular blackbody radiation predicts thermalization rates of free electrons
over entire span of energies available in the lab and the nature. The
calculations based on the QED Klein-Nishina theory of electron-photon
scattering and relativistic Fokker-Planck equation, show that the transition
from classical (Thompson) to QED (Compton) thermalization determined by the
product of electron energy and radiation temperature, is reachable under
conditions for controlled nuclear fusion, and predicts large acceleration of
electron thermalization in the Compton domain and strong damping of plasma
oscillations at the temperatures near plasma nuclear fusion.Comment: 9 pages, 2 figures. arXiv admin note: substantial text overlap with
arXiv:1410.695
Weak Quantum Ergodicity
We examine the consequences of classical ergodicity for the localization
properties of individual quantum eigenstates in the classical limit. We note
that the well known Schnirelman result is a weaker form of quantum ergodicity
than the one implied by random matrix theory. This suggests the possibility of
systems with non-gaussian random eigenstates which are nonetheless ergodic in
the sense of Schnirelman and lead to ergodic transport in the classical limit.
These we call "weakly quantum ergodic.'' Indeed for a class of "slow ergodic"
classical systems, it is found that each eigenstate becomes localized to an
ever decreasing fraction of the available state space, in the semiclassical
limit. Nevertheless, each eigenstate in this limit covers phase space evenly on
any classical scale, and long-time transport properties betwen individual
quantum states remain ergodic due to the diffractive effects which dominate
quantum phase space exploration.Comment: 12 pages, 11 figure
Associated Production of Non-Standard Higgs Bosons at the LHC
We discuss the feasibility of seeing a Higgs boson which decays to four
partons through a pair of (pseudo-)scalars at the LHC. We restrict our search
to Higgs bosons produced in association with a W/Z boson at high transverse
momentum. We argue that subjet analysis techniques are a good discriminant
between such events and W/Z plus jets and top-antitop production. For light
scalar masses (below 30 GeV), we find evidence that a flavor-independent search
for such a non-standard Higgs boson is plausible with 100 fb^-1 of data, while
a Higgs decaying to heavier scalars is only likely to be visible in models
where scalar decays to b quarks dominate.Comment: 6 pages, 4 figure
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