Generalized coherent and squeezed states based on the h(1)⊗su(2)h(1) \otimes su(2) algebra

States which minimize the Schr\"odinger--Robertson uncertainty relation are constructed as eigenstates of an operator which is a element of the h(1) \oplus \su(2) algebra. The relations with supercoherent and supersqueezed states of the supersymmetric harmonic oscillator are given. Moreover, we are able to compute gneneral Hamiltonians which behave like the harmonic oscillator Hamiltonian or are related to the Jaynes--Cummings Hamiltonian.Comment: 42 pages, 10 figure

Electroweak Physics for Color Superconductivity

We construct the effective theories describing the electroweak interactions for the low energy excitations associated with the color superconductive phases of QCD at high matter density. The main result, for the 3 flavor case, is that the quasiparticle Goldstone boson $\pi^0$ decay into two physical massless photons is identical to the zero density case once we use the new Goldstone decay constant and the modified electric charge $\widetilde{e}=e \cos\theta$, with $\tan\theta =2e/\sqrt{3}g_s$ and $g_s$ the strong coupling constant. For 2 flavors we find that the coupling of the quarks to the neutral vector boson $Z^0$ is modified with respect to the zero density case. We finally point out possible applications of our result to the physics of compact objects.Comment: 23 pages, 1 Figure, RevTex. More discussion and references adde

Temperature-dependent chemisorption of C60 on Mo(110): precursors to cage destruction

The catalytically promoted decomposition of C60 has recently been observed on a variety of surfaces upon which the molecule can chemisorb strongly. It is now becoming clear that destruction occurs via conversion of a relatively weakly bound state arising from room-temperature adsorption into a strongly bound state in competition with molecular desorption. On Mo(110) a progression through four distinct chemisorbed states is observed, from weakly bound through the immediate precursor to fragmentation, with increasing hybridisation between molecule and substrate. This change in adsorption state is reflected in both the C 1s core-level position and the width and position of the valence states of the molecule. We present X-ray photoelectron spectroscopy and ultraviolet photoemission spectroscopy results on this system, and an interpretation of the evolution of spectral features as a function of adsorption state.