Experimental neutrino physics

The current experimental status of neutrino physics is reviewed. It contains the evidences for a non-vanishing neutrino rest mass from neutrino oscillation searches. In addition an outlook is given on determining the various mixing matrix elements and mass differences more precisely with new experiments. Of special interest is the value of the mixing angle \theta_{13} determining the possibility of detecting leptonic CP violation in the future. The prospect for absolute mass measurements using beta and double beta decay as well as cosmological observations is presented.Comment: 11 pages, 11 figures, Inv. talk presented at the DPF 2004 meeting of the APS, Riverside, Aug. 200

Determination of quantum symmetries for higher ADE systems from the modular T matrix

We show that the Ocneanu algebra of quantum symmetries, for an ADE diagram (or for higher Coxeter-Dynkin systems, like the Di Francesco - Zuber system) is, in most cases, deduced from the structure of the modular T matrix in the A series. We recover in this way the (known) quantum symmetries of su(2) diagrams and illustrate our method by studying those associated with the three genuine exceptional diagrams of type su(3), namely E5, E9 and E21. This also provides the shortest way to the determination of twisted partition functions in boundary conformal field theory with defect lines.Comment: 30 pages, 16 figures. Several misprints have been corrected. We added several references and the appendix has been enlarged (one section on essential paths and one section devoted to open problems). This article will appear in the Journal of Mathematical Physic

Islam and Science: Contemporary Indonesian Perspective

Kaitan antara Islam dan Sains tidak lepas dari proses kemajuan dan kemunduran sains dalam peradaban Islam. Umat Islam mulai mempelajari atau melakukan penafsiran ilmiah sejak generasi pertama sampai abad ke-lima hijriyah hingga menjadikan masyarakatnya sebagai pelopor Ilmu pengetahuan. Berbanding terbalik dengan kondisi dewasa ini dimana teologi modernisme yang merupakan mainstream pemikiran paradigmatik manusia moderen yang mempunyai misi membebaskan manusia dari dogmatika nilai agama yang membelenggu kemerdekaan dan kreatifitas manusia dalam merespon kehidupan dunia. Tulisan ini akan mengkaji hubungan Islam dengan Sains dalam perspektif keIndonesiaan.ملخص: العلاقة بين الإسلام والعلم لا يمكن فصلها عن عملية التقدم والتراجع العلم في الحضارة الإسلامية. بدأ المسلمون الذين يدرسون أو القيام التفسير العلمي منذ الجيل الأول إلى القرن الخامس هجري إلى جعل المجتمع بوصفه رائدا للعلوم. يتناسب عكسيا مع الوضع الحالي الذي لاهوت التفكير السائد الحداثة وهو نقل نموذجية للإنسان الحديث التي تتمثل مهمتها في تخليص البشرية من قيود القيم الدينية العقائدية حرية الإنسان والإبداع في الاستجابة لحياة العالم. وهذه الورقة دراسة العلاقة بين الإسلام والعلوم نيس في المنظور

Visual and control aspects of saccadic eye movements

Physiological, behavioral, and control investigation of rapid saccadic jump eye movement in human

Measurement of the proton light response of various LAB based scintillators and its implication for supernova neutrino detection via neutrino-proton scattering

The proton light output function in electron-equivalent energy of various scintillators based on linear alkylbenzene (LAB) has been measured in the energy range from 1 MeV to 17.15 MeV for the first time. The measurement was performed at the Physikalisch-Technische Bundesanstalt (PTB) using a neutron beam with continuous energy distribution. The proton light output data is extracted from proton recoil spectra originating from neutron-proton scattering in the scintillator. The functional behavior of the proton light output is described succesfully by Birks' law with a Birks constant kB between (0.0094 +/- 0.0002) cm/MeV and (0.0098 +/- 0.0003) cm/MeV for the different LAB solutions. The constant C, parameterizing the quadratic term in the generalized Birks law, is consistent with zero for all investigated scintillators with an upper limit (95% CL) of about 10^{-7} cm^2/MeV^2. The resulting quenching factors are especially important for future planned supernova neutrino detection based on the elastic scattering of neutrinos on protons. The impact of proton quenching on the supernova event yield from neutrino-proton scattering is discussed.Comment: 12 pages, 17 figures, 4 tables, updated version for publication in Eur.Phys.J.

From modular invariants to graphs: the modular splitting method

We start with a given modular invariant M of a two dimensional su(n)_k conformal field theory (CFT) and present a general method for solving the Ocneanu modular splitting equation and then determine, in a step-by-step explicit construction, 1) the generalized partition functions corresponding to the introduction of boundary conditions and defect lines; 2) the quantum symmetries of the higher ADE graph G associated to the initial modular invariant M. Notice that one does not suppose here that the graph G is already known, since it appears as a by-product of the calculations. We analyze several su(3)_k exceptional cases at levels 5 and 9.Comment: 28 pages, 7 figures. Version 2: updated references. Typos corrected. su(2) example has been removed to shorten the paper. Dual annular matrices for the rejected exceptional su(3) diagram are determine