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astro-ph1998

Observation of Kilohertz Quasiperiodic Oscillations from the Atoll Source 4U 1702-429

Craig B. Markwardt, Tod E. Strohmayer, Jean H. Swank

We present results of Rossi X-Ray Timing Explorer (XTE) observations of the atoll source 4U 1702-429 in the middle of its luminosity range. Kilohertz-range quasiperiodic oscillatio…

math.AP1998★ 5 cited

Large amplitude gravitational waves

G. Ali, J. K. Hunter

We derive an asymptotic solution of the Einstein field equations which describes the propagation of a thin, large amplitude gravitational wave into a curved space-time. The resulti…

hep-ph1998★ 5 cited

Physics Projects for a Future CERN-LNGS Neutrino Programme

P. Picchi, F. Pietropaolo

We present an overview of the future projects concerning the neutrino oscillation physics in Europe. Recently a joint CERN-LNGS scientific committee has reviewed several proposals…

cond-mat.stat-mech1998★ 2 cited

The quantum Heisenberg antiferromagnet on the square lattice

A. Cuccoli, V. Tognetti, P. Verrucchi +1

The pure-quantum self-consistent harmonic approximation, a semiclassical method based on the path-integral formulation of quantum statistical mechanics, is applied to the study of…

cond-mat.stat-mech1998★ 2 cited

Effective Hamiltonian with holomorphic variables

A. Cuccoli, V. Tognetti, R. Giachetti +2

The pure-quantum self-consistent harmonic approximation (PQSCHA) permits to study a quantum system by means of an effective classical Hamiltonian - depending on quantum coupling an…

astro-ph1998★ 4 cited

One more surprise from the Circinus Galaxy: BeppoSAX discovery of a transmission component in hard X-rays

G. Matt, M. Guainazzi, R. Maiolino +11

The Circinus Galaxy has been observed, for the first time above 10 keV, by BeppoSAX. An excess emission above the extrapolation of the best fit 0.1--10 keV spectrum is apparent in…