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[en] In this paper we consider the possibility that strange quark matter (SQM) may manifest in the form of strangelet crystal planets. These planet-like objects are made up of nuggets of SQM, organized in a crystalline structure. We consider the so-called strange matter hypothesis proposed by Bodmer, Witten, and Terazawa, in that SQM may be the absolutely stable state of matter. In this context, we analyze planets made up entirely of strangelets arranged in a crystal lattice. Furthermore, we propose that a solar system with a host compact star may be orbited by strange crystal planets. Under this assumption we calculate the relevant quantities that could potentially be observable, such as the planetary tidal disruption radius, and the gravitational-wave signals that may arise from potential star–planet merger events. Our results show that strangelet crystal planets could potentially be used as an indicator for the existence of SQM.
[en] A general formalism for calculating the bulk viscosity of strange quark matter is developed. Contrary to the common belief that the nonleptonic processes alone give the dominant contribution to the bulk viscosity, the inclusion of the Urca processes is shown to play an important role at intermediate densities when the characteristic r-mode oscillation frequencies are not too high. The interplay of nonleptonic and Urca processes is analyzed in detail
[en] A new Native-mode Data Acquisition system, running on a VAX 11/780, has been designed for the SPS Hyperon Experiments at CERN. The system incorporates a variable number of communicating processes running under VAX/VMS, including user-written monitoring processes. Event handling has been implemented into the CAMAC Driver, and facilities are provided for using a data buffer much larger than the System Maximum Working-set Size. A generalised debugging facility for non terminal-oriented processes is also supported. (author)
[en] The purpose of the note is to discuss two particular [1/1] Pade approximants (PA) of baryon propagators, the comparison of which gives an idea of the domain of validity of the approximation. The propagators considered are the nucleon propagator and the Λ hyperon propagator. It is shown that a [1/1] PA can only produce a very limited class of elastic resonances
[en] Because the Moon is much quieter seismically than the Earth, science to be performed on the Moon using seismology is currently limited by the best available seismometer. We describe the development of a lunar seismometer with sensitivity at least 100 times higher than current state of the art. Analysis of the fundamental noise of this seismometer shows that at frequency below ∼1 Hz the noise will be dominated by Brownian motion of the test mass. Above ∼1 Hz, it will be dominated by thermal noise in the electronic readout. The electronic noise corresponds to ∼10-13 m Hz-1/2. A way to reduce the Brownian motion noise of the test mass using electrostatic force is also discussed
[en] We study the non-spherical gravitational collapse of the strange quark null fluid. The interesting feature which emerges is that the non-spherical collapse of charged strange quark matter leads to a naked singularity whereas the gravitational collapse of neutral quark matter proceeds to form a black hole. We extend the earlier work of Harko and Cheng [Phys. Lett. A 266 (2000) 249] to the non-spherical case. (general)
[en] A unified description for strange quark matter (SQM) objects ranging from strangelets to strange stars is presented, i.e., the UDS model. The important differences on the properties of SQM objects resulted from introducing the UDS model and conventional treatments are discussed. The previously neglected effects such as charge screening, quark depletion, and electrons in conventional treatments are found to be important for the charge properties and stability of strangelets as well as the surface structures of strange stars, which are now well addressed in the UDS model. (paper)
[en] In a previous paper (González López, et al., 2013) , we have discussed the non-perturbative tuning of the chirally rotated Schrödinger functional (χSF). This tuning is required to eliminate bulk O(a) cutoff effects in physical correlation functions. Using our tuning results obtained in González López et al. (2013) we perform scaling and universality tests analyzing the residual O(a) cutoff effects of several step-scaling functions and we compute renormalization factors at the matching scale. As an example of possible application of the χSF we compute the renormalized strange quark mass using large volume data obtained from Wilson twisted mass fermions at maximal twist.