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Various series expansions have been developed for the two-layer, S = 1 2 , square lattice Heisenberg antiferromagnet. High temperature expansions are used to calculate the temperature dependence of the susceptibility and specific heat. At T = 0, Ising expansions are used to study the properties of the Néel-ordered phase, while dimer expansions are used to calculate the ground-state properties a...
The technique of invariant mass spectroscopy has been used to measure, for the first time, the ground state energy of neutron-unbound (28)F, determined to be a resonance in the (27)F+n continuum at 220(50) keV. States in (28)F were populated by the reactions of a 62 MeV/u (29)Ne beam impinging on a 288 mg/cm(2) beryllium target. The measured (28)F ground state energy is in good agreement with U...
A classical two dimensional theory of gravity which has a number of interesting features (including a Newtonian limit, black holes and gravitational collapse) is quantized using conformal field theoretic techniques. The critical dimension depends upon Newton's constant, permitting models with d = 4. The constraint algebra and scaling properties of the model are computed.
We show that a dynamical supersymmetry can appear in a purely fermionic system. This " supersymmetry without bosons " is constructed by application of a recently introduced boson-fermion Dyson mapping from a fermion space to a space comprised of collective bosons and ideal fermions. In some algebraic fermion models of nuclear structure, particular Hamiltonians may lead to collective spectra of ...
Using cosmological N -body simulations and the void probability function (VPF), we investigate the statistical properties of voids within a wide range of initially Gaussian models for the origin of large-scale structure. We study the dependence of the VPF on cosmological parameters, on the power spectrum of primordial fluctuations, and on assumptions about galaxy formation. We pay particular at...
Films of Bi 2
The X-ray satellite BeppoSAX 1 , a major programme of the Italian space agency with participation of the Dutch space agency, was successfully launched from Cape Canaveral on April 30, 1996. After a 2 months period devoted to engineering check out that confirmed the nominal functionality of the satellite and the scientific payload, we have performed a series of observations of celestial objects ...
The Lorentz spaces play an important role in interpolation theory. They also form a class of Banach spaces generalizing the classical L spaces. In this paper, we continue the comparison of the Banach space structures of various weak L spaces begun in [2] and [3]. In [2], mimicking the construction of the Rademacher functions, it was shown that l can be embedded complementably into l. In [3], we...
We consider the category CB of meromorphic finite-dimensional representations of the quantum elliptic algebra B constructed via Belavin’s R-matrix, and the category CF of meromorphic finite-dimensional representations of Felder’s elliptic quantum group Eτ, 2 (gln). For any fixed c ∈ C, we use a version of the Vertex-IRF correspondence to construct two families of (generically) fully faithful fu...
For any given spacetime the choice of time coordinate is undetermined. A particular choice is the absolute time associated with a preferred vector field. Using the absolute time Hamilton’s equations are − δHc δq = π̇ +Θπ, + δHc δπ = q̇, where Θ = V a .;a is the expansion of the vector field. Thus there is a hitherto unnoticed term in the expansion of the preferred vector field. Hamilton’s equatio...
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