N=2 supersymmetric Yang-Mills theories and Whitham integrable hierarchies

We review recent work on the study of N=2 super Yang-Mills theory with gauge group SU(N) from the point of view of the Whitham hierarchy, mainly focusing on three main results: (i) We develop a new recursive method to compute the whole instanton expansion of the low-energy effective prepotential; (ii) We interpret the slow times of the hierarchy as additional couplings and promote them to spurion superfields that softly break N=2 supersymmetry down to N=0 through deformations associated to higher Casimir operators of the gauge group; (iii) We show that the Seiberg-Witten-Whitham equations provide a set of non-trivial constraints on the form of the strong coupling expansion in the vicinity of the maximal singularities. We use them to check a proposal that we make for the value of the off-diagonal couplings at those points of the moduli space.Comment: 19 pages, LaTeX, no figures; Invited talk at the Second Meeting "Trends in Theoretical Physics", held in Buenos Aires, December 199

Does the butterfly diagram indicate asolar flux-transport dynamo?

We address the question whether the properties of the observed latitude-time diagram of sunspot occurence (the butterfly diagram) provide evidence for the operation of a flux-transport dynamo, which explains the migration of the sunspot zones and the period of the solar cycle in terms of a deep equatorward meridional flow. We show that the properties of the butterfly diagram are equally well reproduced by a conventional dynamo model with migrating dynamo waves, but without transport of magnetic flux by a flow. These properties seem to be generic for an oscillatory and migratory field of dipole parity and thus do not permit an observational distinction between different dynamo approaches.Comment: 4 pages, 1 figur

Strong coupling expansion and Seiberg-Witten-Whitham equations

We study the Seiberg-Witten-Whitham equations in the strong coupling regime of the N=2 super Yang-Mills theory in the vicinity of the maximal singularities. In the case of SU(2) the Seiberg-Witten-Whitham equations fix completely the strong coupling expansion. For higher rank SU(N) they provide a set of non-trivial constraints on the form of this expansion. As an example, we study the off-diagonal couplings at the maximal point for which we propose an ansatz that fulfills all the equations.Comment: 10 pages, LaTeX, no figures; v2: The expression for the off-diagonal couplings has been corrected and numerical checks have been extended. One reference adde

Islamic Center Kabupaten Sambas

Kabupaten Sambas merupakan salah satu daerah di Provinsi Kalimantan Barat yang mayoritas penduduknya menganut agama Islam. Kabupaten Sambas memiliki jumlah masyarakat Islam yang banyak serta aktifitas ke-Islaman yang sering dilaksanakan. Berdasarkan alasan tersebut menjadikan wilayah ini dipilih untuk menjadi lokasi perancangan suatu wadah yang mampu menampung semua aktifitas tersebut. Kabupaten Sambas tidak hanya memerlukan wadah tersebut untuk menampung aktifitas, namun untuk mengembalikan jati diri Kabupaten Sambas yang pernah dikenal sebagai Serambi Madinah. Wadah tersebut dapat disebut juga dengan Islamic Center, selain itu dengan adanya Islamic Center di Kabupaten Sambas akan berguna untuk melestarikan kepercayaan yang sudah tumbuh pesat dan akan mampu beriringan dengan adat istiadat di Kabupaten Sambas itu sendiri. Tujuan penulisan ini untuk menjelaskan proses tahapan perancangan Islamic Center di Kabupaten Sambas. Tahapan perancangan yang digunakan dimulai dari penentuan gagasan, mengumpulkan serta menganalisis informasi mengenai Islamic Center, penentuan konsep, mengevaluasi kembali konsep berdasarkan analisis sehingga dapat dilanjutkan pada tahap penerapan langsung pada desain. Hasil tahapan evaluasi menghasilkan bangunan Islamic Center dengan konsep bangunan bermassa banyak dan menjadikan Masjid sebagai bangunan utama yang menjadi pusat aktifitas di kawasan tersebut

The INTEGRAL-OMC Scientific Archive

The Optical Monitoring Camera (OMC) on-board the INTEGRAL satellite has, as one of its scientific goals, the observation of a large number of variable sources previously selected. After almost 6 years of operations, OMC has monitored more than 100 000 sources of scientific interest. In this contribution we present the OMC Scientific Archive (http://sdc.laeff.inta.es/omc/) which has been developed to provide the astronomical community with a quick access to the light curves generated by this instrument.We describe the main characteristics of this archive, as well as important aspects for the users: object types, temporal sampling of light curves and photometric accuracy.Comment: 4 pages, 5 figures. "Highlights of Spanish Astrophysics V" Proceedings of the VIII Scientific Meeting of the Spanish Astronomical Society (SEA) held in Santander, July 7-11, 200