The inverse scattering problem on the line is studied for the generalized Schrodinger equation (d* f/V&*) + @H(X)* fi= Q(X) $, where H(x) is a positive, piecewise continuous function with positive limits H, as x --+ 2~. This equation, in the frequency domain, describes the wave propagation in a nonhomogeneous medium, where Q(X) is the restoring force and l/H(x) is the variable wave speed changi...

The anti-D meson self-energy is evaluated self-consistently, using unitarized coupledchannel theory, by computing the in-medium meson-baryon T -matrix in the C = −1, S = 0 sector. The heavy pseudo-scalar and heavy vector mesons, D̄ and D̄, are treated on equal footing as required by heavy quark spin symmetry. Results for energy levels and widths of D mesic atoms in 12C, 40Ca, 118Sn and 208Pb are ...

We study the bound states of anti-nucleons emerging from the lower continuum in finite nuclei within the relativistic Hartree approach including the contributions of the Dirac sea to the source terms of the meson fields. The Dirac equation is reduced to two Schrödinger-equivalent equations for the nucleon and the anti-nucleon respectively. These two equations are solved simultaneously in an ite...

Recent experimental and theoretical studies suggest the possible existence of nuclear systems with K bound states. If the I=0 attractive KN interaction is strong enough to deeply bind the K and to energetically block the main decay channel to Λπ, then the bound states are expected to have relatively small widths. Detailed studies are available in the literature for different K nuclei. The expec...

We calculate the emission and absorption rates of fixed scalars by the near-extremal five-dimensional black holes that have recently been modeled using intersecting D-branes. We find agreement between the semi-classical and D-brane computations. At low energies the fixed scalar absorption cross-section is smaller than for ordinary scalars and depends on other properties of the black hole than j...

The sensitivity of the deuteron and of pp scattering to the πNN and ρNN coupling constants is investigated systematically. We find that the deuteron can be described about equally well with either large π and ρ or small π and ρ coupling constants. However, pp scattering clearly requires the strong ρ, but favors the weak π (particularly, in 3P0 at low energies). This apparent contradiction betwe...

I review some central physics opportunities at the 15 : : : 30 GeV continuous beam electron accelerator ELFE, proposed to be built in conjunction with the DESY linear collider. Our present detailed knowledge of single parton distributions in hadrons and nuclei needs to be supplemented by measurements of compact valence quark conngurations, accessible through hard exclusive scattering, and of co...

Limits of a system of N Dn-branes in which the bulk and string degrees of freedom decouple to leave a 'matter' theory are investigated and, for n > 4, either give a free theory or require taking N → ∞. The decoupled matter theory is described at low energies by the N → ∞ limit of n + 1 dimensional super Yang-Mills, and at high energies by a free type II string theory in a curved space-time. Met...

The Greens library is presented which provides a set of C++ procedures for the computation of the (radial) Coulomb wave and Green’s functions. Both, the nonrelativistic as well as relativistic representations of these functions are supported by the library. However, while the wave functions are implemented for all, the bound and free–electron states, the Green’s functions are provided only for ...

We study the influence of boundary conditions on energy levels of interacting fields in a box and discuss some consequences when we change the size of the box. In order to do this we calculate the energy levels of bound states of a scalar massive field χ interacting with another scalar field φ through the lagrangian Lint = 3 2gφ2χ2 in an one-dimensional box, on which we impose Dirichlet boundar...