Second Homeland, Second Outland

Before I first came to Korea, I had already written, or at least had begun to write, a great deal of "Korean" pieces, For example, just to name two of them : The musical parade about IMUGI (이무기, 1992) is a strange hybrid of serpent and dragon, an odd composition with similarities to German carnival and Chinese dragon processions, religious rituals, military marches, and an avant-garde scouting of space and time. Also, the one-hour Cello-solo-piece Skordaturen II(1992~94), refers to the slow movements Jinyang(진양) and Jung-mori(중모리) of Komun'go-Sanjo(거문고 산조)

Spatial and temporal filtering of a 10-W Nd:YAG laser with a Fabry-Perot ring-cavity premode cleaner

We report on the use of a fixed-spacer Fabry–Perot ring cavity to filter spatially and temporally a 10-W laser-diode-pumped Nd:YAG master-oscillator power amplifier. The spatial filtering leads to a 7.6-W TEMinfinity beam with 0.1% higher-order transverse mode content. The temporal filtering reduces the relative power fluctuations at 10 MHz to 2.8 x 10^-/sqrtHz, which is 1 dB above the shot-noise limit for 50 mA of detected photocurrent

Bis(triphenyl­phospho­ranyl­idene)ammonium iodide

The title compound, C36H30NP2 +·I−, was obtained accidently from crystallization of a reaction mixture containing [(Ph3P)2N]OH and B(OH)3, which was contaminated with MeI. There are two independent [(Ph3P)2N]+ cations and two I− anions within the asymmetric unit. The central PNP angles are non-linear [137.6 (2) and 134.4 (2)°] and the phenyl substituents on P centres adopt different conformations within these two cations

Datocracy

Datocracy is a compound neologism that embraces transhistorical liberations and reconfigurations of data, in its multiple perceptual-linguistic forms, into new value relations and systems of governance, democratic or otherwise. Datocracy evolves from the often-violent separation of data from its habitual matrices, by virtue of dispositifs, or apparatuses, as defined by Michel Foucault and elaborated by Gilles Deleuze. This paper examines material examples of the functioning of such dispositifs through Georges Bataille, Walter Benjamin, François Rabelais (through Mikhail Bakhtin), and William Burroughs. These examples demonstrate how emancipated data is readily recuperated into new relations of governance, as liberatory socio-political tools (or apparatuses), or vehicles of tyranny. In its passage between liberation and recuperation, in its state of utterance, perhaps, data experiences a protosemantic moment, a pre-definitional state, which offers the promise of a momentary escape from, or rather within, value relations

Integral representations for correlation functions of the XXZ chain at finite temperature

We derive a novel multiple integral representation for a generating function of the \s^z-\s^z correlation functions of the spin-\2 XXZ chain at finite temperature and finite, longitudinal magnetic field. Our work combines algebraic Bethe ansatz techniques for the calculation of matrix elements with the quantum transfer matrix approach to thermodynamics.Comment: 33 pages, 2 figures, v2: 2 typos corrected, 1 figure adde

Finite temperature density matrix and two-point correlations in the antiferromagnetic XXZ chain

We derive finite temperature versions of integral formulae for the two-point correlation functions in the antiferromagnetic XXZ chain. The derivation is based on the summation of density matrix elements characterizing a finite chain segment of length $m$. On this occasion we also supply a proof of the basic integral formula for the density matrix presented in an earlier publication.Comment: 35 page

Algebraic Bethe ansatz for the gl(1∣|2) generalized model II: the three gradings

The algebraic Bethe ansatz can be performed rather abstractly for whole classes of models sharing the same $R$-matrix, the only prerequisite being the existence of an appropriate pseudo vacuum state. Here we perform the algebraic Bethe ansatz for all models with $9 \times 9$, rational, gl(1$|$2)-invariant $R$-matrix and all three possibilities of choosing the grading. Our Bethe ansatz solution applies, for instance, to the supersymmetric t-J model, the supersymmetric $U$ model and a number of interesting impurity models. It may be extended to obtain the quantum transfer matrix spectrum for this class of models. The properties of a specific model enter the Bethe ansatz solution (i.e. the expression for the transfer matrix eigenvalue and the Bethe ansatz equations) through the three pseudo vacuum eigenvalues of the diagonal elements of the monodromy matrix which in this context are called the parameters of the model.Comment: paragraph added in section 3, reference added, version to appear in J.Phys.

Form factor expansion for thermal correlators

We consider finite temperature correlation functions in massive integrable Quantum Field Theory. Using a regularization by putting the system in finite volume, we develop a novel approach (based on multi-dimensional residues) to the form factor expansion for thermal correlators. The first few terms are obtained explicitly in theories with diagonal scattering. We also discuss the validity of the LeClair-Mussardo proposal.Comment: 41 pages; v2: minor corrections, v3: minor correction

Non-linear Integral Equations and Determinant Formulae of the Open XXZ Spin Chain

We derive a non-linear integral equation for the Bethe-ansatz solvable open XXZ spin chain of arbitrary length describing the lowest lying state with zero magnetization. For this case we show how to combine the integral representation with the known determinant formula of norms and scalar products.Comment: final versio