Bounds on compositeness from neutrinoless double beta decay.
Assuming the existence of a heavy Majorana neutral particle arising from a composite model scenario we discuss the constraints imposed by present experimental limits of half-life neutrinoless double {beta} decay (0{nu}{beta}{beta}) measurements on the coupling of the heavy composite neutrinos to the gauge bosons. For neutrino masses {ital M}{sub {ital N}}=1 TeV we obtain a rather weak lower bound on the compositeness scale: {

title: Vacuum spin waves through the chiral anomaly
abstract: It is shown that the quantum electrodynamic chiral anomaly generates “spin waves” in the vacuum, when a low-energy electromagnetic field is applied. Such spin waves are (in principle) observable in a vacuum region with a condensed matter boundary surface which has a finite Hall conductance.

title: Gravitational Wave Detection with Michelson Interferometers
abstract: Electromagnetic methods recently proposed for detecting gravitational waves modify the Michelson phase shift analysis (historically employed for special relativity). We suggest that a frequency modulation analysis is more suited to general relativity. An incident photon in the presence of a very long wavelength gravitational wave will have a finite probability of being returned as a final photon with a frequency shift whose magnitude is equal to the gravitational wave frequency. The effect is due to the non-linear coupling between electromagnetic and gravitational waves. The frequency modulation is derived directly from the Maxwell-Einstein equations.

title: Viscosity of high energy nuclear fluids
abstract: Relativistic high energy heavy ion collision cross sections have been interpreted in terms of almost ideal liquid droplets of nuclear matter. The experimental low viscosity of these nuclear fluids have been of considerable recent quantum chromodynamic interest. The viscosity is discussed here in terms of the string fragmentation models wherein the temperature dependence of the nuclear fluid viscosity obeys the Vogel–Fulcher–Tammann law.

title: Two-time correlation functions:
stochastic and conventional quantum mechanics

abstract: An investigation of two-time correlation functions is reported
within the framework of (i) stochastic quantum mechanics and (ii)
conventional Heisenberg-Schrödinger quantum mechanics. The
spectral functions associated with the two-time electric dipole moment
correlation functions are worked out in detail for the case of the
hydrogen atom. While the single time averages are identical for
stochastic and conventional quantum mechanics, differences arise in
the two approaches for multiple time correlation functions.

title: Modeling Pion and Nucleon Total Cross-sections
abstract: With an eye towards proposed experiments at the LHC, an earlier eikonal mini‐jet model with soft gluons has now been extended to compute πp and ππ total cross‐sections.

title: Soft photons from relativistic heavy ion collisions.
abstract: Production of soft photons in relativistic heavy ion collisions due to bremsstrahlung processes in quark matter and hadronic matter is studied. The contribution of pion-driven processes is found to dominate the yield.

title: History of quark-gluon plasma evolution from photon interferometry.
abstract: Two-photon intensity interferometry is used to probe the dynamics of quarks and gluons in a high-energy nucleus-nucleus collision. A (1+1)-dimensional expansion of the plasma according to Bjorken hydrodynamics as well as a (3+1)-dimensional expansion, both with a first-order phase transition, are considered. The correlation of high transverse-momentum photons is sensitive to the details of the space-time evolution of the high density QCD plasma. The so-called ``longitudinal'' and ``outward'' correlations are found to be dramatically affected by the transverse expansion of the system.

title: High-energy photons from expanding quark-gluon plasma and hot hadronic matter.
abstract: The emission of high-energy photons from an expanding quark-gluon plasma (QGP), which undergoes a first-order phase transition to a hot hadronic gas before freeze-out, is evaluated. Compton and annihilation processes in the quark-gluon plasma and an exhaustive array of {ital hh}{r arrow}{ital h}{gamma} reactions as wel l as decays in hot hadronic matter are considered. We find that, if the initial temperature of the QGP is more than twice the critical temperature, then, beyond a transverse momentum of about 2--3 GeV, the photons from the QGP outshine those having their origin in hadronic matter. We further note that the increase in degrees of freedom in the hot hadronic matter reduces the lifetime of the mixed phase.

title: Rapidity distribution of photons emitted from a hadronizing quark-gluon plasma.
abstract: The rapidity distribution of thermal photons emitted from a hadronizing quark-gluon plasma is obtained with initial conditions locally determined from the hadronic rapidity density and assuming a longitudinal scaling expansion as in Bjorken hydrodynamics. The corresponding results for direct (QCD) photons and for decay photons are also obtained. The rapidity distributions of the three types of photons are found to be quite different and may help identify the most favorable window in the momentum space for identification for the quark-gluon plasma

title: Interference and off-shell effects of fragment scattering in elastic breakup of light ions.
abstract: The triple-differential cross sections for elastic breakup of 156-MeV /sup 6/Li measured at larger relative momenta of the outgoing /alpha/-particle and deuteron fragments exhibit conspicuous double-peaked structures in the momentum-transfer dependence. The origin of these features is explored, sensitively revealing interference and off-shell scattering effects in the fragment-target interaction. Elastic breakup data of 56-MeV deuterons and 90-MeV /sup 3/He are reanalyzed in view of these effects on the basis of the prior-form distorted-wave Born-approximation theory.