Exact solutions for the Einstein-Gauss-Bonnet theory in five dimensions: Black holes, wormholes and spacetime horns

An exhaustive classification of certain class of static solutions for the five-dimensional Einstein-Gauss-Bonnet theory in vacuum is presented. The class of metrics under consideration is such that the spacelike section is a warped product of the real line with a nontrivial base manifold. It is shown that for generic values of the coupling constants the base manifold must be necessarily of constant curvature, and the solution reduces to the topological extension of the Boulware-Deser metric. It is also shown that the base manifold admits a wider class of geometries for the special case when the Gauss-Bonnet coupling is properly tuned in terms of the cosmological and Newton constants. This freedom in the metric at the boundary, which determines the base manifold, allows the existence of three main branches of geometries in the bulk. For negative cosmological constant, if the boundary metric is such that the base manifold is arbitrary, but fixed, the solution describes black holes whose horizon geometry inherits the metric of the base manifold. If the base manifold possesses a negative constant Ricci scalar, two different kinds of wormholes in vacuum are obtained. For base manifolds with vanishing Ricci scalar, a different class of solutions appears resembling "spacetime horns". There is also a special case for which, if the base manifold is of constant curvature, due to certain class of degeneration of the field equations, the metric admits an arbitrary redshift function. For wormholes and spacetime horns, there are regions for which the gravitational and centrifugal forces point towards the same direction. All these solutions have finite Euclidean action, which reduces to the free energy in the case of black holes, and vanishes in the other cases. Their mass is also obtained from a surface integral.Comment: 31 pages, 1 figure, minor changes and references added. Final version to be published in PR

Analisa Pengaruh Leader-member Exchange, Perceived Organizational Support Terhadap Kepuasan Kerja Karyawan Dengan Motivasi Kerja Sebagai Variabel Mediator Di Hotel Tarakan Plaza

Penelitian ini bertujuan untuk mengukur pengaruh Leader-member Exchange, Perceived Organizational Support terhadap kepuasan kerja karyawan di Hotel Tarakan Plaza dengan motivasi kerja sebagai variabel mediator. Pengambilan data dilakukan dengan menggunakan teknik sensus dan penyebaran kuesioner kepada seluruh responden. Program Structural Equation Modeling (SEM) dengan metode Partial Least Square digunakan dalam penelitian ini. Hasil penelitian menunjukkan Leader-member Exchange berpengaruh secara positif dan signifikan terhadap kepuasan kerja karyawan, Perceived Organizational Support berpengaruh secara positif dan signifikan terhadap kepuasan kerja karyawan, motivasi kerja berpengaruh secara positif dan signifikan terhadap kepuasan kerja karyawan, Leader-member Exchange berpengaruh secara positif dan signifikan terhadap motivasi kerja, dan Perceived Organizational Support berpengaruh secara positif dan signifikan terhadap motivasi kerja

Aplikasi Peta 3-Dimensi Universitas Negeri Manado

Universitas Negeri Manado memiliki area yang luas menyebabkan pengujung, mahasiswa, dosen, dan staf sulit mengetahui letak bangunan, fungsi setiap bangunan, dan fasilitas yang ada. Media petunjuk lokasi yang tersedia saat ini berupa miniatur peta universitas yang tersedia di gedung utama, namun informasi ditampilkan terbatas. Penelitian ini bertujuan membuat aplikasi peta 3 dimensi untuk kampus universitas Negeri Manado. Penambahan unsur 3-dimensi membuat aplikasi peta menjadi interaktif, menggunakan grafika pada user interface untuk menvisualisasikan dan memanipulasi objek tertentu. Metode penelitian yang digunakan rekayasa perangkat lunak dengan menggunakan proses model spiral dan tools yang digunakan seperti, Google SketchUp untuk modeling, Maxon Cinema 4D untuk membuat dataran dan melakukan rendering objek, Adobe flash untuk membangun aplikasi. Aplikasi peta 3-dimensi Universitas Negeri Manado ini memberikan informasi berupa lokasi gedung, deskripsi gedung, sarana dan prasarana yang tersedia di Universitas Negeri Manado serta diharapkan dapat digunakan sebagai alat bantu memudahkan dosen, staff, mahasiswa, dan calon mahasiswa ataupun pengunjung dalam mencari tempat ataupun objek dalam lingkungan kampus

Effect of Sunflower and Marine Oils on Ruminal Microbiota, In vitro Fermentation and Digesta Fatty Acid Profile

Funding This work has been funded by Consejería de Educación, Junta de Castilla y León (research project LE007A07). Acknowledgments We acknowledge support of the publication fee by the CSIC Open Access Publication Support Initiative through its Unit of Information Resources for Research (URICI). Support received from CICYT project AGL2005-04760-C02-02 is gratefully acknowledged.Peer reviewedPublisher PD

Soft and stiff normal modes in floppy colloidal square lattices

Floppy microscale spring networks are widely studied in theory and simulations, but no well-controlled experimental system currently exists. Here, we show that square lattices consisting of colloid-supported lipid bilayers functionalized with DNA linkers act as microscale floppy spring networks. We extract their normal modes by inverting the particle displacement correlation matrix, showing the emergence of a spectrum of soft modes with low effective stiffness in addition to stiff modes that derive from linker interactions. Evaluation of the softest mode, a uniform shear mode, reveals that shear stiffness decreases with lattice size. Experiments match well with Brownian particle simulations and we develop a theoretical description based on mapping interactions onto linear response to describe the modes. Our results reveal the importance of entropic steric effects, and can be used for developing reconfigurable materials at the colloidal length scale

Phases of anisotropic dipolar antiferromagnets

We study systems of classical magnetic dipoles on simple cubic lattices with dipolar and antiferromagnetic exchange interactions. By analysis and Monte Carlo (MC) simulations, we find how the antiferromagnetic phases vary with uniaxial and fourfold anisotropy constants, C and D, as well as with exchange strength J. We pay special attention to the spin reorientation (SR) phase, and exhibit in detail the nature of its broken symmetries. By mean field theory and by MC, we also obtain the ratio of the higher ordering temperature to the SR transition temperature, and show that it depends mainly on D/C, and rather weakly on J. We find a reverse SR transition.Comment: 10 LaTeX pages, 14 eps figures. Submitted to PRB on 03 October 2005. Accepted on 13 December 200

Visualizing the 3D Polar Power Patterns and Excitations of Planar Arrays with Matlab

[Abstrac] This paper discusses the use of Matlab to create three-dimensional polar plots of the power patterns of planar arrays together with 3D plots of the amplitudes and phases of their excitations. A few lines of Matlab M-code suffice to create complex plots

Effects of Measurement Distance on Measurements of Symmetrically Shaped Patterns Generated by Line Sources

[Abstract] Symmetrically shaped patterns, generated by real continuous linear apertures derived from Taylor distributions, resemble Taylor sum patterns in regard to the distance-dependence of their sidelobe heights. Their ripple shows negligible near-field degradation. If the aperture distribution is complex, however, the ripple and sidelobe levels show previously unreported degradation behavior, including a lowering of the first sidelobe level