21,280 research outputs found
Entropy generation in a model of reversible computation
We present a model in which, due to the quantum nature of the signals
controlling the implementation time of successive unitary computational steps,
\emph{physical} irreversibility appears in the execution of a \emph{logically}
reversible computation.Comment: 13 pages, 6 figure
Two-dimensional Quantum Field Models (with applications to Statistical Mechanics)
Two dimensional toy models display, in a gentler setting, manysalient aspects
of Quantum Field Theory. Here I discuss a concrete two dimensional case, the
Thirring model, which illustrates several important concepts of this theory:
the anomalous dimension of the fields; the exact solvability; the anomalies of
the Ward-Takahashi identities. Besides, I give a glimpse of the decisive role
that this model plays in the study of an apparently unrelated topic:
correlation critical exponents of two dimensional lattice systems of
Statistical Mechanics.Comment: 10 pages; International Conference on Mathematical Physics 2012 -
Topical Section: Quantum Field Theor
NA60 results on phi production in the hadronic and leptonic channels in In-In collisions at 158 GeV
The NA60 experiment at the CERN SPS studied phi meson production in In-In
collisions at 158 A GeV via muon and kaon decay channels. Results in the
hadronic channel are presented for the first time. These are discussed in the
framework of the so-called phi puzzle through the comparison with the previous
NA60 measurements in the muon channel. The yield and inverse m_T slopes
observed in the two channels are compatible within errors, showing that the
large discrepancies seen in Pb-Pb collisions between NA50 (muon pairs) and NA49
(kaon pairs) are not seen in the NA60 In-In data.Comment: 4 pages, 4 figures - To appear in the conference proceedings for
Quark Matter 2009, March 30 - April 4, Knoxville, Tennesse
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