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We study Mach shocks generated by fast partonic jets propagating through a deconfined strongly-interacting matter. Our main goal is to take into account different types of collective motion during the formation and evolution of this matter. We predict a significant deformation of Mach shocks in central Au+Au collisions at RHIC and LHC energies as compared to the case of jet propagation in a static medium. The observed broadening of the near-side two-particle correlations in pseudorapidity space is explained by the Bjorken-like longitudinal expansion. Three-particle correlation measurements are proposed for a more detailed study of the Mach shock waves.
We study the effects of isovector-scalar meson delta on the equation of state (EOS) of neutron star matter in strong magnetic fields. The EOS of neutron-star matter and nucleon effective masses are calculated in the framework of Lagrangian field theory, which is solved within the mean-field approximation. From the numerical results one can find that the delta-field leads to a remarkable splitting of proton and neutron effective masses. The strength of delta-field decreases with the increasing of the magnetic field and is little at ultrastrong field. The proton effective mass is highly influenced by magnetic fields, while the effect of magnetic fields on the neutron effective mass is negligible. The EOS turns out to be stiffer at B < 10^15G but becomes softer at stronger magnetic field after including the delta-field. The AMM terms can affect the system merely at ultrastrong magnetic field(B > 10^19G). In the range of 10^15 G - 10^18 G the properties of neutron-star matter are found to be similar with those without magnetic fields.
The D-meson spectral density at finite temperature is obtained within a self-consistent coupled-channel approach. For the bare meson-baryon interaction, a separable potential is taken, whose parameters are fixed by the position and width of the Lambda_c (2593) resonance. The quasiparticle peak stays close to the free D-meson mass, indicating a small change in the effective mass for finite density and temperature. However, the considerable width of the spectral density implies physics beyond the quasiparticle approach. Our results indicate that the medium modifications for the D-mesons in nucleus-nucleus collisions at FAIR (GSI) will be dominantly on the width and not, as previously expected, on the mass.
Potential energy surfaces are calculated by using the most advanced asymmetric two-center shell model allowing to obtain shell and pairing corrections which are added to the Yukawa-plus-exponential model deformation energy. Shell effects are of crucial importance for experimental observation of spontaneous disintegration by heavy ion emission. Results for 222Ra, 232U, 236Pu and 242Cm illustrate the main ideas and show for the first time for a cluster emitter a potential barrier obtained by using the macroscopic-microscopic method.
In this increasingly complex world of learned information delivery and discovery - is it possible that the "free lunch" the Publishing world worries about could come true? Although Open Access and Institutional Repositories have not (yet) created the "scorched earth" effect many were predicting, they are slowly and inevitably gaining momentum. Broader access to top-level information via Google (and others) does indeed appear to be "good enough" for many in their search for content. But you rarely get food for free in a good quality restaurant. You pay for the selection, preparation, speed and expertise of the delivery. At the soup kitchen the food can often be filling - but the queue will be long, the wait even longer and there is no chance of silver service or à la carte. If you are unfortunate enough to have little choice then this may be a great solution. Others will be willing to pay for a more satisfactory meal. As in all aspects of life, diversification and specialisation are fundamental forces. The publishing community in the years to come will continue to develop its offerings for a variety of needs that require more than just broth. To stretch the analogy, the ongoing presence of tap water in our lives has done little to halt the extraordinary rise of bottled water as part of our staple diet. Business reality will continue to settle these types of debate; my bet is that the commercial publishers see a role as providing information that commands an intrinsic value proposition to enough customers to remain economically viable for some time to come. Inspired by the comments and ideas expounded by Dr. James O'Donnell of Georgetown University on the liblicense listserv on 20th July this year, this paper will look to expand on the analogy and identify the good, the bad - but importantly the difference in information quality and access that will result in the radically changed (but still co-existent) information landscape of tomorrow.