3,049 research outputs found
Rate of Period Change as a Diagnostic of Cepheid Properties
Rate of period change for a Cepheid is shown to be a parameter that
is capable of indicating the instability strip crossing mode for individual
objects, and, in conjunction with light amplitude, likely location within the
instability strip. Observed rates of period change in over 200 Milky Way
Cepheids are demonstrated to be in general agreement with predictions from
stellar evolutionary models, although the sample also displays features that
are inconsistent with some published models and indicative of the importance of
additional factors not fully incorporated in models to date.Comment: Published in PASP (March 2006); TeX source & figures now provide
Scalar density fluctuation at critical end point in NJL model
Soft mode near the critical end point in the phase diagram of two-flavor
Nambu--Jona-Lasinio (NJL) model is investigated within the leading 1/N_c
approximation with N_c being the number of the colors. It is explicitly shown
by studying the spectral function of the scalar channel that the relevant soft
mode is the scalar density fluctuation, which is coupled with the quark number
density, while the sigma meson mode stays massive.Comment: 9 pages, 4 figure
Hadron production in lepton-nuclei interactions at high energies: Monte Carlo generator HARDPING 2.0
Hadron production in lepton-nucleus interactions at high-energies is
considered in framework of developing Monte Carlo event generator HARDPING
(HARD Probe INteraction Generator). Such effects as formation length, energy
loss and multiple rescattering for produced hadrons and their constituents are
implemented into the HARDPING 2.0. Available data from HERMES collaboration on
hadron production in lepton-nucleus collisions are described by the present
version of the HARDPING generator in a reasonable agreement.Comment: 7 pages, 3 figure
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