221 research outputs found
Scaling of variables and the relation between noncommutative parameters in Noncommutative Quantum Mechanics
We consider Noncommutative Quantum Mechanics with phase space
noncommutativity. In particular, we show that a scaling of variables leaves the
noncommutative algebra invariant, so that only the self-consistent effective
parameters of the model are physically relevant. We also discuss the recently
proposed relation of direct proportionality between the noncommutative
parameters, showing that it has a limited applicability.Comment: Revtex4, 4 pages; version to match the published on
Comment on "Feynman Effective Classical Potential in the Schrodinger Formulation"
We comment on the paper "Feynman Effective Classical Potential in the
Schrodinger Formulation"[Phys. Rev. Lett. 81, 3303 (1998)]. We show that the
results in this paper about the time evolution of a wave packet in a double
well potential can be properly explained by resorting to a variational
principle for the effective action. A way to improve on these results is also
discussed.Comment: 1 page, 2eps figures, Revte
Astrophysical constraints on the confining models : the Field Correlator Method
We explore the relevance of confinement in quark matter models for the
possible quark core of neutron stars. For the quark phase, we adopt the
equation of state (EoS) derived with the Field Correlator Method, extended to
the zero temperature limit. For the hadronic phase, we use the microscopic
Brueckner-Hartree-Fock many-body theory. We find that the currently adopted
value of the gluon condensate , which gives
a critical temperature , produces maximum masses which
are only marginally consistent with the observational limit, while larger
masses are possible if the gluon condensate is increased.Comment: 7 pages, 5 figure
The LEBT Chopper for the Spiral 2 Project
International audienceThe Spiral 2 driver uses a slow chopper situated in the common section of the low energy beam transport line to change the beam intensity, to cut off the beam in case of critical loss and to avoid hitting the wheel structure of rotating targets. The device has to work up to 10 kV, 1 kHz repetition frequency rate and its design is based on standard power circuits, custom alarm board and vacuum feed-through. The paper summarizes the design principles and describes the test results of the final device which has been installed on the beam line test bench
Synthesis of 5-substituted 7,9-dihydro-8H-[1,3]dioxolo[4,5-h][2,3]benzodiazepin-8-ones as anticonvulsant agents
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