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      Casimir effect for a massive scalar field under mixed boundary conditions

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          Abstract

          We discuss the Casimir effect for a massive bosonic field with mixed (Dirichlet-Neumann) boundary conditions. We use the zeta-function regularization prescription to obtain our physical results. Particularly, we analyse how the Casimir energy varies with the mass of the field and compare this mass dependence with those obtained for other boundary conditions. This is done graphically. Some other graphs involving a massive fermionic field are also included.

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          Magneto-optical trapping of diatomic molecules

          Jun Ye, Benjamin Stuhl, Mark Yeo … (2012)
          The development of the magneto-optical trap revolutionized the fields of atomic and quantum physics by providing a simple method for the rapid production of ultracold, trapped atoms. A similar technique for producing a diverse set of dense, ultracold diatomic molecular species will likewise transform the study of strongly interacting quantum systems, precision measurement, and physical chemistry. We demonstrate one- and two-dimensional transverse laser cooling and magneto-optical trapping of the polar molecule yttrium (II) oxide (YO). Using a quasicycling optical transition we observe transverse Doppler cooling of a YO molecular beam to a temperature of 5 mK, limited by interaction time. With the addition of an oscillating magnetic quadrupole field we demonstrate a transverse magneto-optical trap and achieve temperatures of 2 mK.
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            Superdense Crystal Packings of Ellipsoids

            (2004)
            Particle packing problems have fascinated people since the dawn of civilization, and continue to intrigue mathematicians and scientists. Resurgent interest has been spurred by the recent proof of Kepler's conjecture: the face-centered cubic lattice provides the densest packing of equal spheres with a packing fraction \(\phi\approx0.7405\) \cite{Kepler_Hales}. Here we report on the densest known packings of congruent ellipsoids. The family of new packings are crystal (periodic) arrangements of nearly spherically-shaped ellipsoids, and always surpass the densest lattice packing. A remarkable maximum density of \(\phi\approx0.7707\) is achieved for both prolate and oblate ellipsoids with aspect ratios of \(\sqrt{3}\) and \(1/\sqrt{3}\), respectively, and each ellipsoid has 14 touching neighbors. Present results do not exclude the possibility that even denser crystal packings of ellipsoids could be found, and that a corresponding Kepler-like conjecture could be formulated for ellipsoids.
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              Measurement of dijet angular distributions at sqrt{s}=1.96TeV and searches for quark compositeness and extra spatial dimensions

              D0 Collaboration, V Abazov, Gerald Blazey … (2009)
              We present the first measurement of dijet angular distributions in ppbar collisions at sqrt{s}=1.96TeV at the Fermilab Tevatron Collider. The measurement is based on a dataset corresponding to an integrated luminosity of up to 0.7fb-1 collected with the D0 detector. Dijet angular distributions have been measured over a range of dijet masses, from 0.25TeV to above 1.1TeV. The data are in good agreement with the predictions of perturbative QCD and are used to constrain new physics models including quark compositeness, large extra dimensions, and TeV-1 scale extra dimensions. For all models we set the most stringent direct limits to date.
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                Author and article information

                Journal
                Journal ID (publisher-id): bjp
                Title: Brazilian Journal of Physics
                Abbreviated Title: Braz. J. Phys.
                Publisher: Sociedade Brasileira de Física (São Paulo, SP, Brazil )
                ISSN (Print): 0103-9733
                ISSN (Electronic): 1678-4448
                Publication date (Print and electronic): December 2003
                Volume: 33
                Issue: 4
                Pages: 860-866
                Affiliations
                [01] Rio de Janeiro RJ orgnameUniversidade Federal do Rio de Janeiro orgdiv1Instituto de Física Brazil
                Article
                Publisher ID: S0103-97332003000400042 Publisher ID: S0103-9733(03)03300442
                DOI: 10.1590/S0103-97332003000400042
                SO-VID: 2292fe70-61f0-421e-b997-3de709e57228
                License:

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                Date received : 25 April 2003
                Date accepted : 02 September 2003
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 35, Pages: 7
                Product

                SciELO Brazil

                Self URI: Full text available only in PDF format (EN)
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                Subject: Regular Articles

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