3,918 research outputs found
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
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