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Search Results: 1 - 10 of 85074 matches for " W. Greiner "
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Non-Trivial Fixed Points of the Scalar Field Theory
K. Sailer,W. Greiner
Physics , 1996,
Abstract: The phase structure of the scalar field theory with arbitrary powers of the gradient operator and a local non-analytic potential is investigated by the help of the RG in Euclidean space. The RG equation for the generating function of the derivative part of the action is derived. Infinitely many non-trivial fixed points of the RG transformations are found. The corresponding effective actions are unbounded from below and do probably not exhibit any particle content. Therefore they do not provide physically sensible theories.
Renormalized finite temperature effective potential of $SU(2)$ Yang-Mills theory
K. Sailer,W. Greiner
Physics , 1995,
Abstract: It is shown that the renormalized finite temperature effective potential for continuum $SU(2)$ Yang-Mills theory develops a non-perturbative minimum for sufficiently strong coupling, i.e. below a critical temperature. The corresponding phase can be the candidate for the confining phase of the continuum theory and becomes energetically favoured basicly due to the decay of the $A^0$ condensate into three gluons.
Optical variability of the supersoft source RX~J0019.8+2156
J. Greiner,W. Wenzel
Physics , 1994,
Abstract: We present a 100 yr optical lightcurve of the recently discovered supersoft X-ray source RX~J0019.8+2156 as deduced from photographic plates of Harvard and Sonneberg Observatory. Apart from the periodic orbital variations two different timescales of optical variability are discovered. The timescales and amplitudes of this variability are discussed in the framework of the steady nuclear burning model.
Synthesis of superheavies: State of affairs and outlooks
V. Zagrebaev,W. Greiner
Physics , 2008, DOI: 10.1103/PhysRevC.78.034610
Abstract: Nuclear reactions leading to formation of new superheavy elements and isotopes are discussed in the paper. ``Cold'' and ``hot'' synthesis, fusion of fission fragments, transfer reactions and reactions with radioactive ion beams are analyzed along with their abilities and limitations. Several most promising reactions are proposed for experimental study.
Stability of Three Unit Charges. Necessary Conditions
D. K. Gridnev,C. Greiner,W. Greiner
Mathematics , 2005, DOI: 10.1063/1.1873039
Abstract: We consider the stability of three Coulomb charges $\{+1, -1, -1 \}$ with finite masses in the framework of nonrelativistic quantum mechanics. A simple physical condition on masses is derived to guarantee the absence of bound states below the dissociation thresholds. In particular this proves that certain negative muonic ions are unstable, thus extending the old result of Thirring \cite{thirring} to the actual values of all masses. The proof is done by reducing the initial problem to the question of binding of one particle in some effective potential.
Deformation Energy Minima at Finite Mass Asymmetry
D. N. Poenaru,W. Greiner
Physics , 2003, DOI: 10.1209/epl/i2003-00612-8
Abstract: A very general saddle point nuclear shape may be found as a solution of an integro-differential equation without giving apriori any shape parametrization. By introducing phenomenological shell corrections one obtains minima of deformation energy for binary fission of parent nuclei at a finite (non-zero) mass asymmetry. Results are presented for reflection asymmetric saddle point shapes of thorium and uranium even-mass isotopes with A=226-238 and A=230-238 respectively.
A model-independent analysis of the dependence of the anomalous J/psi suppression on the number of participant nucleons
A. P. Kostyuk,W. Greiner
Physics , 2003, DOI: 10.1088/0954-3899/29/10/102
Abstract: A recently published experimental dependence of the J/psi to Drell-Yan ratio on the measured, by a zero degree calorimeter, forward energy E_ZDC in Pb+Pb collisions at the CERN SPS is analyzed. Using a model-independent approach it is shown that the data are at variance with an earlier published experimental dependence of the same quantity on the transverse energy of neutral hadrons E_T. The discrepancy is related to a moderate centrality region: 100 < N_p < 200 (N_p is the number of participant nucleons) and is peculiar only to the data obtained within the `minimum bias' analysis (using the `theoretical Drell-Yan'). This could result from systematic experimental errors in the minimum bias sample. A possible source of the errors is discussed.
The phase-space structure of the Klein-Gordon field
C. Best,P. Gornicki,W. Greiner
Physics , 1993, DOI: 10.1006/aphy.1993.1055
Abstract: The formalism based on the equal-time Wigner function of the two-point correlation function for a quantized Klein--Gordon field is presented. The notion of the gauge-invariant Wigner transform is introduced and equations for the corresponding phase-space calculus are formulated. The equations of motion governing the Wigner function of the Klein--Gordon field are derived. It is shown that they lead to a relativistic transport equation with electric and magnetic forces and quantum corrections. The governing equations are much simpler than in the fermionic case which has been treated earlier. In addition the newly developed formalism is applied towards the description of spontaneous symmetry breakdown.
Effect of the Haar measure on the finite temperature effective potential of $SU(2)$ Yang-Mills theory
K. Sailer,A. Sch?fer,W. Greiner
Physics , 1995, DOI: 10.1016/0370-2693(95)00346-M
Abstract: Including the Haar measure we show that the effective potential of the regularized SU(2) Yang-Mills theory has a minimum at vanishing Wilson-line $W=0$ for strong coupling, whereas it develops two degenerate minima close to $W=\pm 1$ for weak coupling. This suggests that the non-abelian character of $SU(2)$ as contained in the Haar measure might be responsible for confinement.
Diffractive Meson Production and the Quark-Pomeron Coupling
J. Klenner,A. Sch?fer,W. Greiner
Physics , 1994, DOI: 10.1007/BF01298909
Abstract: Diffractive meson production at HERA offers interesting possibilities to investigate diffractive processes and thus to learn something about the properties of the pomeron. The most succesful phenomenological description of the pomeron so far assumes it to couple like a $C = +1$ isoscalar photon to single quarks. This coupling leads, however, to problems for exclusive diffractive reactions. We propose a new phenomenological pomeron vertex, which leads to very good fits to the known data, but avoids the problems of the old vertex.
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