We exhibit a situation in which cosmological perturbations of astrophysical relevance propagating through a bounce are affected in a scale-dependent way. Involving only the evolution of a scalar field in a closed universe described by general relativity, the model is consistent with causality. Such a specific counterexample leads to the conclusion that imposing causality is not sufficient to de...

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1550-7998=20 It is argued that in the case of a (four-dimensional) smooth transition across a (dilaton-driven) curvature bounce growing vector fluctuations evolve continuously into decaying solutions at later times in the post-bounce epoch. Analytical examples of this observation are given. In the case of multidimensional bouncing models the situation is different, since the system of different...

In a seminal paper [9] Ginzburg and Adler analyzed the bounce-back boundary conditions for the lattice Boltzmann scheme and showed that it could be made exact to second order for the Poiseuille flow if some expressions depending upon the parameters of the method were satisfied, thus defining so-called “magic parameters”. Using the Taylor expansion method that one of us developed, we analyze a s...

Abstract The bounce of an oval shaped football may appear to be erratic but it can be described by simple laws of physics. Projected at an oblique angle without spin or with backspin, a football usually bounces backward if the top end points backward on impact. Projected with topspin, a football usually bounces forward. A football incident with topspin will sometimes bounce to a much larger hei...

This memo defines a Multipurpose Internet Mail Extensions (MIME) content-type that may be used by a message transfer agent (MTA) or electronic mail gateway to report the result of an attempt to deliver a message to one or more recipients. This content-type is intended as a machine-processable replacement for the various types of delivery status notifications currently used in Internet electroni...

*Deutsche Forschungsgemeinschaft Research Center of Molecular Physiology of the Brain (CMPB) and †Institut für Mikrobiologie und Genetik, Abteilung Molekulare Mikrobiologie, Universität Göttingen, D-37077 Göttingen, Germany; and ‡Department of Plant Pathology and Microbiology, The Otto Warburg Minerva Center for Agricultural Biotechnology, Faculty of Agricultural, Food and Environmental Quality...

"Why did you come to Albany, anyway?" "Earn some money." That was Norman Mailer's reply, as the writer, film producer, and one-time New York City mayoral candidate agreed to a rather informal interview, it was just that blend of frankness and honesty which pervaded both the airport interview and his speech before a full, predominantly student, audience in the Campus Center Ballroom late last ev...

The purpose of this short review is to describe cosmological models with a linear inhomogeneous time-dependent equation of state (EoS) for dark energy, when dark fluid is coupled with dark matter. This may lead to a bounce cosmology. We consider equivalent descriptions in terms of the EoS parameters for an exponential, a power-law, or a double-exponential law for the scale factor a. Stability i...