2,005,492 research outputs found
Linear Solar Models: a simple tool to investigate the properties of solar interior
We describe a simple method to study the dependence of the solar properties
on a generic (small) modification the physical inputs adopted in standard solar
models calculations.Comment: 3 pages, proceeding of the TAUP09 Worksho
Monte-Carlo simulations of the violation of the fluctuation-dissipation theorem in domain growth processes
Numerical simulations of various domain growth systems are reported, in order
to compute the parameter describing the violation of fluctuation dissipation
theorem (FDT) in aging phenomena. We compute two-times correlation and response
functions and find that, as expected from the exact solution of a certain
mean-field model (equivalent to the O(N) model in three dimensions, in the
limit of N going to infinity), this parameter is equal to one (no violation of
FDT) in the quasi-equilibrium regime (short separation of times), and zero in
the aging regime.Comment: 5 pages, 5 eps figure
Effective temperature of a dissipative driven mesoscopic system
We study the nonequilibrium dynamics of a mesoscopic metallic ring threaded
by a time-dependent magnetic field and coupled to an electronic reservoir. We
analyze the relation between the (non-stationary) real-time Keldysh and
retarded Green functions and we find that, in the linear response regime with
weak heat transfer to the environment, an effective temperature accounts for
the modification of the equilibrium fluctuation-dissipation relation. We
discuss possible extensions of this analysis.Comment: 4 pages, 4 figures, RevTe
Direct measurement of the quantum state of the electromagnetic field in a superconducting transmission line
We propose an experimental procedure to directly measure the state of an
electromagnetic field inside a resonator, corresponding to a superconducting
transmission line, coupled to a Cooper-pair box (CPB). The measurement protocol
is based on the use of a dispersive interaction between the field and the CPB,
and the coupling to an external classical field that is tuned to resonance with
either the field or the CPB. We present a numerical simulation that
demonstrates the feasibility of this protocol, which is within reach of present
technology.Comment: Accepted for publication in Physical Review A (Rapid Communication).
4 pages, 2 figure
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