Abstract. A viscoelastic equation with Balakrishnan-Taylor damping and nonlinear boundary/interior sources is considered in a bounded domain. Under appropriate assumptions on the relaxation function and with certain initial data and by adopting the perturbed energy method, we establish uniform decay rate of the solution energy in terms of the behavior of the relaxation function, which are not n...

X Ž . Picosecond fluorescence decay is observed in a new family of dendrimers constructed from 4,4 -bis diphenylamino stilbene repeat units. The rate of the decay is shown to depend on detection wavelength and the generation number in such a way that the energy of accepting states gradually lowers with the generation number. These observations can be consistently described in terms of the fast ...

We analyze the inclusive decay mode B → Xs +Missing Energy in the unparticle model, where an unparticle can also serve as the missing energy. We use the Heavy Quark Effective Theory in the calculation. The analytical result of the decay width in the free quark limit and that of the differential decay rate to the order of 1/mb are presented. Numerical results of the inclusive mode show interesti...

We have searched for an exotic decay of orthopositronium into a single photon and a short-lived neutral boson in the hitherto unexplored mass region above 900 keV=c 2 , by noting that this decay is one of few remaining candidates which could explain the discrepancy of the orthopositronium decay-rate. A high-resolution measurement of the associated photon energy spectrum was carried out with a g...

Abstract. Under appropriate assumptions the energy of wave equations with damping and variable coefficients c(x)utt − div(b(x)∇u) + a(x)ut = h(x) has been shown to decay. Determining the rate of decay for the higher order energies involving the kth order spatial and time derivatives has been an open problem with the exception of some sparse results obtained for k = 1, 2, 3. We establish estimat...

We calculate the fully retarded one-photon exchange interaction potential between electrically neutral, identical atoms, one of which is assumed to be in an excited state, by matching scattering matrix (S matrix) element with effective Hamiltonian. Based on Feynman prescription, we obtain imaginary part energy. Our results lead precise formulas for distance-dependent enhancement and suppression...