58,711 research outputs found
Asymptotic Inverse Problem for Almost-Periodically Perturbed Quantum Harmonic Oscillator
Consider quantum harmonic oscillator, perturbed by an even almost-periodic
complex-valued potential with bounded derivative and primitive. Suppose that we
know the first correction to the spectral asymptotics
(, where
and is the spectrum of the unperturbed and the perturbed
operators, respectively). We obtain the formula that recovers the frequencies
and the Fourier coefficients of the perturbation.Comment: 6 page
Systematic study of high- hadron and photon production with the PHENIX experiment
The suppression of hadrons with large transverse momentum () in
central Au+Au collisions at = 200 GeV compared to a binary
scaled p+p reference is one of the major discoveries at RHIC. To understand the
nature of this suppression PHENIX has performed detailed studies of the energy
and system-size dependence of the suppression pattern, including the first RHIC
measurement near SPS energies. An additional source of information is provided
by direct photons. Since they escape the medium basically unaffected they can
provide a high baseline for hard-scattering processes.
An overview of hadron production at high in different colliding
systems and at energies from GeV will be
given. In addition, the latest direct photon measurements by the PHENIX
experiment shall be discussed.Comment: 6 pages, 3 figures, Proceeding for the Conference Strangeness in
Quark Matter, Levoca, Slovakia, June 24-29, 200
A note on the computation of geometrically defined relative velocities
We discuss some aspects about the computation of kinematic, spectroscopic,
Fermi and astrometric relative velocities that are geometrically defined in
general relativity. Mainly, we state that kinematic and spectroscopic relative
velocities only depend on the 4-velocities of the observer and the test
particle, unlike Fermi and astrometric relative velocities, that also depend on
the acceleration of the observer and the corresponding relative position of the
test particle, but only at the event of observation and not around it, as it
would be deduced, in principle, from the definition of these velocities.
Finally, we propose an open problem in general relativity that consists on
finding intrinsic expressions for Fermi and astrometric relative velocities
avoiding terms that involve the evolution of the relative position of the test
particle. For this purpose, the proofs given in this paper can serve as
inspiration.Comment: 8 pages, 2 figure
Effect of certain oxidizing and reducing compounds on germination of Neurospora macroconidia
Effect of certain oxidizing and reducing compounds on germination of Neurospora macroconidi
Structural and mechanical effects of interstitial sinks
Changes in structure and mechanical properties due to loss of interstitials to reactive metal coatings studied in dispersion strengthened niobium alloy
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