In certain Lorentz-covariant higher-derivative field theories of spins ≤1, would-be ultraviolet divergences generate color-singlet poles as infrared divergences. Absence of higher-order poles implies ten-dimensional supersymmetric Yang-Mills with bound-state supergravity, in close analogy with open string theory. 1 mailto:[email protected] 2 mailto:[email protected]

We investigate decays of the scalar bound state present in the Abbott-Farhi model. We show that decays with photons in the final state may have large branching ratios. We also show that operators coupling the scalar particle to two photons or to a photon and a Z are not seriously constrained by electroweak data, unlike other sectors of the Abbott-Farhi model. This work is supported in part by t...

In these proceedings, we discuss the current status of nuclear bound state predictions based on chiral nuclear interactions. Results of ordinary sand p-shell nuclei and light hypernuclei are shown.

The physics of single nonmagnetic impurity immersed in a two-band s-wave superconductor with relative phase 0 between its two order parameters is studied and elucidated. It is shown that midgap bound states are always induced by nonmagnetic impurities when = s -wave superconductors . These bound states emerge as a consequence of the topological nature of the corresponding Bogoliubov-de Gennes e...

Let (− k 2)u = −u + q(x)u − k 2 u = δ(x), x ∈ R, ∂u ∂|x| − iku → 0, |x| → ∞. Assume that the potential q(x) is real-valued and compactly supported: q(x) = q(x), q(x) = 0 for |x| ≥ 1, 1 −1 |q|dx < ∞, and that q(x) produces no bound states. Let u(−1, k) and u(1, k) ∀k > 0 be the data. Theorem.Under the above assumptions these data determine q(x) uniquely.

We interpret instantons on a torus with twisted boundary conditions, in terms of bound states of branes. The interplay between the SU (N) and U (1) parts of the U (N) theory of N 4-branes allows the construction of a variety of bound states. The SU (N) and U (1) parts can contribute fractional amounts to the total instanton number which is integral.

In this work we solve the Dirac equation by constructing the exact bound state solutions for a mixing of generalized vector and scalar Hartmann potentials. This is done provided the vector and scalar potentials hold some relation. Namely, one must be equals to or minus the other. Finally the case of some quasi-exactly solvable potentials are briefly commented.

The features of a model interpreting the light scalar mesons as diquark-antidiquark bound states and the consequences of its natural extension to include heavy quarks are briefly reviewed. Preprint numbers: FNT/T-2004/22, BA-TH/503/04, CERN-PH-TH/2004-241.

It has previously been proved that the lowest order supersymmetric WKB approximation reproduces the exact bound state spectrum of shape invariant potentials. We show that this is not true for a new, recently discovered class of shape invariant potentials and analyse the reasons underlying this breakdown of the usual proof. 1 Institute of Physics, Sachivalaya Marg, Bhubaneswar 751005,India.

We briefly review the situation around the claimed deeply bound K states in different recent experiments and concentrate particularly on the state Kpp seen by the FINUDA collaboration in nuclear K absorption. We perform a theoretical simulation of the process and show that the peak in the Λp spectrum that was interpreted as a deep Kpp bound state corresponds mostly to the process Kpp → Λp follo...