Results for "U. Buchenau"

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On the origin of the Kohlrausch exponentApr 11 2016Apr 16 2016The stretched Kohlrausch relaxation function observed in undercooled liquids close to the glass transition is explained in terms of the rise of the number of possible structural rearrangements with an increasing number of atoms or molecules in a rearranging ... More
Retardation and flow at the glass transitionNov 29 2015Feb 18 2016The crossover from back-and-forth jumps between structural minima to the no-return jumps of the viscous flow is modeled in terms of an ensemble of double-well potentials with a finite decay probability. The ensemble is characterized by the Kohlrausch-exponent ... More
Bulk and shear relaxation in glasses and highly viscous liquidsOct 23 2011Apr 02 2012The ratio between the couplings of a relaxational process to compression and shear, respectively, is calculated in the Eshelby picture of structural rearrangements within a surrounding elastic matrix, assuming a constant density of stable structures in ... More
An Eshelby model for the highly viscous flowSep 25 2007The shear flow and the dielectric alpha-process in molecular glass formers is modeled in terms of local structural rearrangements which reverse a strong local shear. Using Eshelby's solution of the corresponding elasticity theory problem (J. D. Eshelby, ... More
Mechanical Relaxation in Glasses and at the Glass TransitionAug 18 2000The Gilroy-Phillips model of relaxational jumps in asymmetric double-well potentials, developed for the Arrhenius-type secondary relaxations of the glass phase, is extended to a formal description of the breakdown of the shear modulus at the glass transition, ... More
Modeling the nonlinear dielectric response of glass formersDec 01 2015Sep 12 2016The recently developed pragmatical model of asymmetric double-well potentials with a finite lifetime is applied to nonlinear dielectric data in polar undercooled liquids. The viscous effects from the finite lifetime provide a crossover from the cooperative ... More
Energy landscape - a key concept for the dynamics of glasses and liquidsSep 06 2002Nov 29 2002There is a growing belief that the mode coupling theory is the proper microscopic theory for the dynamics of the undercooled liquid above a critical temperature T_c. In addition, there is some evidence that the system leaves the saddlepoints of the energy ... More
On the energy landscape at the glass transitionJul 09 2004A recent hypothesis claims that the glass transition itself, though it is a very pronounced relaxation peak, is no separate relaxation process at all, but is just the breakdown of the shear modulus due to the weak elastic dipole interaction between all ... More
Eshelby ensemble of highly viscous flow out of equilibriumFeb 07 2019The recent description of the highly viscous flow in terms of irreversible structural Eshelby rearrangements is extended to calculate the heat capacity of a glass former at a constant cooling rate through the glass transition. The result is compared to ... More
Irreversible Eshelby description of aging in glassesApr 28 2019The recent description of the cooling through the glass transition in terms of irreversible structural Eshelby rearrangements with a single average fictive temperature is extended to a distribution of fictive temperatures around the average one. The extension ... More
A new way to evaluate x-ray Brillouin scattering dataFeb 28 2014Making use of the classical second moment sum rule, it is possible to convert a series of constant-Q x-ray Brillouin scattering scans (Q momentum transfer) into a series of constant frequency scans over the measured $Q$ range. The method is applied to ... More
An asymmetry model for the highly viscous flowDec 23 2008Jul 25 2009The shear flow is modeled in terms of local structural rearrangements. Most of these rearrangements are strongly asymmetric, because the embedding matrix tends to be elastically adapted to the initial state and to have a marked elastic misfit with regard ... More
Mechanical and dielectric relaxation spectra in seven highly viscous glass formersApr 11 2007Published dielectric and shear data of six molecular glass formers and one polymer are evaluated in terms of a spectrum of thermally activated processes, with the same barrier density for the retardation spectrum of shear and dielectrics. The viscosity, ... More
Eshelby ensemble of highly viscous flow out of equilibriumFeb 07 2019Feb 24 2019The recent description of the highly viscous flow in terms of irreversible structural Eshelby rearrangements is extended to calculate the heat capacity of a glass former at a constant cooling rate through the glass transition. The result is compared to ... More
Modeling the nonlinear dielectric response of glass formersDec 01 2015Nov 06 2016The recently developed pragmatical model of asymmetric double-well potentials with a finite lifetime is applied to nonlinear dielectric data in polar undercooled liquids. The viscous effects from the finite lifetime provide a crossover from the cooperative ... More
A thermodynamic treatment of the glass transitionMar 15 2012Apr 18 2012In undercooled liquids, the anharmonicity of the interatomic potentials causes a volume increase of the inherent structures with increasing energy content. In most glass formers, this increase is stronger than the vibrational Gr\"uneisen volume expansion ... More
Comparison of shear and dielectrics in highly viscous liquidsJun 08 2010A relation between shear and dielectric spectra is derived for highly viscous liquids with a small rotational contribution $\Delta\epsilon$ to the dielectric constant. It is valid if the shear fluctuations and the electric dipole fluctuations have the ... More
Fragility and elasticity - a new perspectiveSep 23 2009The fragility (the abnormally strong temperature dependence of the viscosity) of highly viscous liquids is shown to have two sources. The first is the temperature dependence of the barriers between inherent states considered earlier. The second is the ... More
The breakdown of the shear modulus at the glass transitionFeb 02 2002Aug 25 2003The glass transition is described in terms of thermally activated local structural rearrangements, the secondary relaxations of the glass phase. The interaction between these secondary relaxations leads to a much faster and much more dramatic breakdown ... More
A pragmatical access to the viscous flowSep 30 2016Within the recently published pragmatical model of the flow process in undercooled liquids, a relation for the viscosity is derived which is in excellent agreement with measured data. According to this relation, most of the viscous flow is due to the ... More
Thermodynamics and dynamics of the inherent states at the glass transitionAug 25 2014It has been recently shown that one can understand the Prigogine-Defay ratio at the glass transition in terms of freezing into one of the many inherent states of the undercooled liquid. In the present paper, the treatment is extended to the dynamics at ... More
On the mechanism of the highly viscous flowFeb 10 2011May 23 2011The asymmetry model for the highly viscous flow postulates thermally activated jumps from a practically undistorted ground state to strongly distorted, but stable structures, with a pronounced Eshelby backstress from the distorted surroundings. The viscosity ... More
Anharmonic soft modes in glassesJul 10 2019The anharmonic localized soft modes in glasses and undercooled liquids found in recent numerical work are explained in terms of two stable structural minima of the small core of the mode, frozen on the low-lying saddle point of the core potential by the ... More
Fragility and compressibility at the glass transitionJan 07 2004Jul 06 2004Isothermal compressibilities and Brillouin sound velocities from the literature allow to separate the compressibility at the glass transition into a high-frequency vibrational and a low-frequency relaxational part. Their ratio shows the linear fragility ... More
Comment on: A minimal model for beta relaxation in viscous liquids, by Jeppe C. Dyre and Niels Boye Olsen, Phys. Rev. Lett. 91, 155703 (2003)Oct 23 2003This is a comment on the beautiful results of Jeppe Dyre and Niels Boie Olsen, published as a recent Physical Review Letter.
An atomic mechanism for the boson peak in metallic glassesMar 14 2008The boson peak in metallic glasses is modeled in terms of local structural shear rearrangements. Using Eshelby's solution of the corresponding elasticity theory problem (J. D. Eshelby, Proc. Roy. Soc. A241, 376 (1957)), one can calculate the saddle point ... More
A new interpretation of dielectric data in molecular glass formersNov 16 2005Jan 13 2006Literature dielectric data of glycerol, propylene carbonate and ortho-terphenyl (OTP) show that the measured dielectric relaxation is a decade faster than the Debye expectation, but still a decade slower than the breakdown of the shear modulus. From a ... More
A new view of the Lindemann criterionNov 19 2013The Lindemann criterion is reformulated in terms of the average shear modulus $G_c$ of the melting crystal, indicating a critical melting shear strain which is necessary to form the many different inherent states of the liquid. In glass formers with covalent ... More
Neutron scattering study of the vibrations in vitreous silica and germaniaFeb 08 2005The incoherent approximation for the determination of the vibrational density of states of glasses from inelastic neutron or x-ray scattering data is extended to treat the coherent scattering. The method is applied to new room temperature measurements ... More
Neutron scattering evidence on the nature of the boson peakJul 06 2004A close inspection of neutron spectra of glass formers in the frequency region above the boson peak does not show the constant eigenvalue density expected for a random dynamical matrix, but a slow decrease towards higher eigenvalues. In 1,4-polybutadiene ... More
Dielectric and thermal relaxation in the energy landscapeJul 03 2006Aug 02 2006We derive an energy landscape interpretation of dielectric relaxation times in undercooled liquids, comparing it to the traditional Debye and Gemant-DiMarzio-Bishop pictures. The interaction between different local structural rearrangements in the energy ... More
Scaling the Temperature-dependent Boson Peak of Vitreous Silica with the high-frequency Bulk Modulus derived from Brillouin Scattering DataJan 25 2010The position and strength of the boson peak in silica glass vary considerably with temperature $T$. Such variations cannot be explained solely with changes in the Debye energy. New Brillouin scattering measurements are presented which allow determining ... More
The Raman coupling function in amorphous silica and the nature of the long wavelength excitations in disordered systemsNov 16 1999New Raman and incoherent neutron scattering data at various temperatures and molecular dynamic simulations in amorphous silica, are compared to obtain the Raman coupling coefficient $C(\omega)$ and, in particular, its low frequency limit. This study indicates ... More
Single-magnet rotary flowmeter for liquid metalsDec 17 2010Jun 18 2011We present a theory of single-magnet flowmeter for liquid metals and compare it with experimental results. The flowmeter consists of a freely rotating permanent magnet, which is magnetized perpendicularly to the axle it is mounted on. When such a magnet ... More
Contactless Electromagnetic Phase-Shift Flowmeter for Liquid MetalsOct 03 2010Mar 31 2011We present a concept and test results of an eddy-current flowmeter for liquid metals. The flow rate is determined by applying a weak ac magnetic field to a liquid metal flow and measuring the flow-induced phase disturbance in the external electromagnetic ... More
Degeneracies in the length spectra of metric graphsJul 18 2008The spectral theory of quantum graphs is related via an exact trace formula with the spectrum of the lengths of periodic orbits (cycles) on the graphs. The latter is a degenerate spectrum, and understanding its structure (i.e.,finding out how many different ... More
Microscopic theory of absorption and emission in nanostructured solar cells: Beyond the generalized Planck formulaDec 08 2009Absorption and emission in inorganic bipolar solar cells based on low dimensional structures exhibiting the effects of quantum confinement is investigated in the framework of a comprehensive microscopic theory of the optical and electronic degrees of ... More
On $F$-Quadratic Stochastic OperatorsDec 09 2006In this paper we introduce a notion of $F-$ quadratic stochastic operator. For a wide class of such operators we show that each operator of the class has unique fixed point. Also we prove that any trajectory of the $F$-quadratic stochastic operator converges ... More
Turning Points in the Evolution of Isolated Neutron Stars' Magnetic FieldsNov 22 2006Nov 28 2006During the life of isolated neutron stars (NSs) their magnetic field passes through a variety of evolutionary phases. Depending on its strength and structure and on the physical state of the NS (e.g. cooling, rotation), the field looks qualitatively and ... More
Symmetries of geodesic motion in Gödel-type spacetimesApr 16 2014May 15 2014In this paper, we study Noether gauge symmetries of geodesic motion for geodesic Lagrangian of four classes of metrics of G\"{o}del-type spacetimes for which we calculated the Noether gauge symmetries for all classes I-IV, and find the first integrals ... More
Resummed coefficient function for the shape functionFeb 12 2001We present a leading evaluation of the resummed coefficient function for the shape function. It is also shown that the coefficient function is short-distance-dominated. Our results allow relating the shape function computed on the lattice to the physical ... More
The evaluation of loop amplitudes via differential equationsAug 02 2004The evaluation of loop amplitudes via differential equations and harmonic polylogarithms is discussed at an introductory level. The method is based on evolution equations in the masses or in the external kinematical invariants and on a proper choice of ... More
Effective Theories for Exclusive and Seminclusive Processes and FactorizationSep 15 1998The effective theories for massless quarks describing exclusive and seminclusive processes are discussed, considering in particular the factorization problem.
Supersymmetry, a Biased ReviewApr 02 2002May 16 2002This set of lectures contain a brief review of some basic supersymmetry and its representations, with emphasis on superspace and superfields. Starting from the Poincar\'e group, the supersymmetric extensions allowed by the Coleman-Mandula theorem and ... More
A statistical derivation of non-relativistic quantum theorySep 28 2011Dec 22 2014A previous derivation of the single-particle Schr\"odinger equation from statistical assumptions is generalized to an arbitrary number $N$ of particles moving in three-dimensional space. Spin and gauge fields are also taken into account. It is found that ... More
The First Stars in the UniverseJun 15 2016The basic processes of the formation of the first stars in the primordial Universe are outlined and the implications for cosmological structure formation discussed. By employing theoretical and numerical models of cosmic structure evolution embedded within ... More
Equivariant Higher Analytic Torsion and Equivariant Euler CharacteristicJul 09 1997We show that J. Lott's equivariant higher analytic torsion for compact group actions depends only on the equivariant Euler characteristic.
Possible Dark Matter Signals from Antiprotons, Positrons, X-rays and Gamma-raysMay 13 2005A number of signals involving charged cosmic rays and high-energy photons have been interpreted as being due to annihilating dark matter. This article provides an overview of the experimental evidence and discusses in particular detections of antiprotons ... More
The Utility of Time-Symmetric Quantum Counterfactuals: A Response to KastnerJan 15 2008Dec 15 2008Kastner's (Philosophy of Science 70, 2003, pp. 145--163) recent objections to the counterfactual usage of the time-symmetric Aharonov-Bergmann-Lebowitz rule by the author, especially her claims that the resulting time-symmetric quantum counterfactuals ... More
LRG Production of Di-Jets As a Probe of s-Channel UnitarityJun 28 2004Hard diffractive production of di-jets in the Tevatron and HERA are explored. It is argued that a consistent pQCD description of these data can be attained after s-channel unitarity re-scattering screening corrections are incorporated in the calculation. ... More
Beam DiagnosticsApr 02 2014As soon as the first particles emerge from an ion source, the source characteristics need to be determined. The total beam intensity, the transverse particle distributions, the beam divergence and emittance as well as the longitudinal parameters of the ... More
Interpreting Quantum Chromodynamics from Spin Glass- and Polymer AnalogiesFeb 07 2010Feb 11 2010In an informal way some kind of Ising Lattice QCD is introduced which allows to interprete and discuss the well-known theory of quantum chromodynamics (confinement, quarks and gluons, etc.) from simple phenomena of magnetism and polymer physics. Also ... More
On the dynamics of spin systems in the Landau-Lifshitz theoryOct 04 2006Dec 01 2006In the framework of the Landau-Lifshitz equations without any dissipation (an approximation which may also be helpful for finite but weak Gilbert damping), with all interactions included, for general ground states, geometries and domain structures, and ... More
Electroweak Physics at the Tevatron and LHC: Theoretical Status and PerspectivesNov 07 2005I review the status of theoretical calculations relevant for electroweak physics at the Tevatron and LHC and discuss future directions. I also give a brief overview of current electroweak data and discuss future expectations.
Squark pair production at the LHCAug 25 2009Nov 09 2009We present NNLO cross sections for squark- antisquark production at the LHC. We have calculated new analytic expressions for the scale dependent scaling functions at one and two loop.
Noise assisted Ramsey interferometryJun 03 2013Jan 17 2014I analyze a metrological strategy for improving the precision of frequency estimation via Ramsey interferometry with strings of atoms in the presence of correlated dephasing. This strategy does not employ entangled states, but rather a product state which ... More
Topology and chiral symmetry breaking in QCDOct 24 1999We construct a model to study the impact of instantons on the low lying eigenvalue spectrum of the Dirac operator. The model is by necessity, approximate, though it does incorporate the important symmetries of the underlying field theory. The model also ... More
Complete classification of a class of $3$-dimensional algebrasOct 30 2017Nov 27 2017A complete classification of a class of $3$-dimensional algebras is provided. In algebraically closed field $\mathbb{F}$ case this class is an open, dense (in Zariski topology) subset of $\mathbb{F}^{27}$.
The Giant Monopole Resonance in the Sn Isotopes: Why is Tin so "Fluffy"?Aug 03 2006The isoscalar giant monopole resonance (GMR) has been investigated in a series of Sn isotopes (A=112--124) using inelstic scattering of 400-MeV alpha particles at extremely forward angles (including 0deg). The primary aim of the investigation has been ... More
On classification and invariants of second order non-parabolic linear partial differential equations in two variablesJan 06 2017The paper deals with second order abstract linear partial differential equations (LPDE) over a partial differential field with two commuting differential operators. In terms of usual differential equations the main content can be presented as follows. ... More
Parafermi Algebra and InterordinalityAug 16 2006Apr 08 2016Starting from the observation that for neighboring orders $p=2^{n}-1, p'=2^{n+1}-1 $ of the well-known Green's representations of parafermi algebra there exists a specifiable interordinal relationship, matrices with similar properties are constructed. ... More
Micromagnetic Simulation of Nanoscale Films with Perpendicular AnisotropyNov 27 1996A model is studied for the theoretical description of nanoscale magnetic films with high perpendicular anisotropy. In the model the magnetic film is described in terms of single domain magnetic grains with Ising-like behavior, interacting via exchange ... More
MAGNETISATION REVERSAL AND DOMAIN STRUCTURE IN THIN MAGNETIC FILMS: THEORY AND COMPUTER SIMULATIONMay 19 1995A model is introduced for the theoretical description of nanoscale magnetic films with high perpendicular anisotropy. In the model the magnetic film is described in terms of single domain magnetic grains, interacting via exchange as well as via dipolar ... More
Recent Theoretical Developments in B -> X_s l^+ l^- DecaysMay 13 2004We present a concise review of the theoretical status of the rare semileptonic B -> X_s l^+ l^- decays in the standard model. Particular attention is thereby devoted to the recent theoretical progress concerning, on the one hand the next-to-next-to-leading ... More
Physics at ELSA, achievements and futureJan 24 2005At ELSA interesting results on baryon resonances have been obtained by the CB-ELSA, the CBELSA/TAPS and the SAPHIR collaborations. New resonances were found, in particular a new $\rm D_{15}(2070)$ decaying into $p\eta$, was recently observed by the CB-ELSA ... More
The search for missing baryon resonancesJan 11 2005Experiments with electromagnetic probes are promising to search for baryon resonances that have been predicted by quark models but have not yet been observed. Data sets from different experiments show interesting resonance structures possibly due to so ... More
The Aharonov-Bohm-Effect, Non-commutative Geometry, Dislocation Theory, and MagnetismNov 06 2007Feb 04 2008The four items mentioned in the title are put into context in an informal way.
On the significance of quantum effects and interactions for the apparent universality of Bloch laws for M_s(T)Mar 18 2003Jun 08 2003The apparent universality of Bloch's T^{3/2}-law for the temperature dependence of the spontaneous magnetization, and of generalizations thereof, is considered. It is argued that in the derivation one should not only consider the exchange interaction ... More
First-person visualizations of the special and general theory of relativityAug 25 2007Visualizations that adopt a first-person point of view allow observation and, in the case of interactive simulations, experimentation with relativistic scenes. This paper gives examples of three types of first-person visualizations: watching objects that ... More
Convergence of numerical schemes for the Korteweg-de Vries-Kawahara equationJun 09 2011We are concerned with the convergence of a numerical scheme for the initial-boundary value problem associated to the Korteweg-de Vries- Kawahara equation (in short Kawahara equation), which is a transport equation perturbed by dispersive terms of 3rd ... More
Implicit finite difference schemes for the magnetic induction equationsFeb 02 2011We describe high order accurate and stable fully-discrete finite difference schemes for the initial-boundary value problem associated with the magnetic induction equations. These equations model the evolution of a magnetic field due to a given velocity ... More
Theoretical Challenges for a Precision Measurement of the W Mass at Hadron CollidersJul 25 2000We discuss the O(alpha) electroweak radiative corrections to W and Z boson production and their impact on the measurement of the W mass at hadron colliders. The results of recent improved calculations are presented. We also briefly discuss the O(alpha) ... More
Probing the $WWγ$ Vertex in Radiative $b$-Quark DecaysJul 19 1993The recent CLEO results on on radiative $b$-quark decays are used to derive constraints on anomalous $WW\gamma$ couplings. These constraints are compared with expectations from $p\bar p\rightarrow e^\pm p\llap/_T\gamma+X$ at the Tevatron. The usefulness ... More
Electroweak Radiative Corrections to W Boson Production at the TevatronSep 10 1998We discuss the O(alpha) electroweak radiative corrections to W boson production at the Tevatron and their effect on the W boson mass extracted by experiment. The results of a new calculation of the O(alpha) corrections are presented and compared with ... More
Amplitude Zeros and Rapidity Correlations in $Wγ$ and $WZ$ Production in Hadronic CollisionsAug 15 1994A comparative study of amplitude zeros in $W\gamma$ and $WZ$ production in hadronic collisions is presented. The Standard Model amplitude for $q_1 \bar q_2 \rightarrow W^\pm Z $ at the Born-level is shown to exhibit an approximate zero located at $\cos\theta ... More
A new sum rule to determine Vub/VcbMay 17 2001May 30 2001We present a new sum rule which does not contain any Landau-pole effect and allows a determination of Vub/Vcb with a theoretical error of O(5%).
Theory and simulation of quantum photovoltaic devices based on the non-equilibrium Green's function formalismJun 12 2012This article reviews the application of the non-equilibrium Green's function formalism to the simulation of novel photovoltaic devices utilizing quantum confinement effects in low dimensional absorber structures. It covers well-known aspects of the fundamental ... More
Theory and simulation of photogeneration and transport in Si-SiOx superlattice absorbersSep 19 2010Si-SiOx superlattices are among the candidates that have been proposed as high band gap absorber material in all-Si tandem solar cell devices. Due to the large potential barriers for photoexited charge carriers, transport in these devices is restricted ... More
Simulation of light propagation in thin semiconductor films with non-local electron-photon interactionAug 14 2013The propagation of light in layered semiconductor media is described theoretically and simulated numerically within the framework of the non-equilibrium Green's function formalism as used for state-of-the-art nanodevice simulations, treating the non-local ... More
The asymmetry term in the nuclear-matter incompressibility from measurements on the giant monopole resonance: An UpdateJan 17 2011We have investigated the isoscalar giant monopole resonances (ISGMR) in $^{112-124}$Sn and $^{106-116}$Cd nuclei using inelastic scattering of 386-MeV $\alpha$-particles at extremely forward angles, including 0$^\circ$. The strength distributions for ... More
Index theory, eta forms, and Deligne cohomologyJan 14 2002Sep 21 2006The Chern classes of a K-theory class which is represented by a vector bundle with connection admit refinements to Cheeger-Simons classes in Deligne cohomology. In the present paper we consider similar refinements in the case where the classes in K-theory ... More
Conformal Killing forms on Riemannian manifoldsJun 11 2002Conformal Killing forms are a natural generalization of conformal vector fields on Riemannian manifolds. They are defined as sections in the kernel of a conformally invariant first order differential operator. We show the existence of conformal Killing ... More
Recurrence of the twisted planar random walkMar 05 2008We show that the "twisted" planar random walk - which results by summing up stationary increments rotated by multiples of a fixed angle - is recurrent under diverse assumptions on the increment process. For example, if the increment process is alpha-mixing ... More
Complete classifications of two-dimensional general, commutative, commutative Jordan, division and evolution real algebrasMay 03 2017A complete classifications of two-dimensional general, commutative, commutative Jordan, division and evolution real algebras are given. In the case of evolution algebras their groups of automorphisms and derivation algebras are described as well.
Quantum frequency estimation with trapped ions and atomsFeb 07 2011Apr 20 2012We discuss strategies for quantum enhanced estimation of atomic transition frequencies with ions stored in Paul traps or neutral atoms trapped in optical lattices. We show that only marginal quantum improvements can be achieved using standard Ramsey interferometry ... More
Resummed B -> X_u l nu Decay Distributions to Next-to-Leading OrderApr 02 2001May 30 2001We perform factorization of the most general distribution in semileptonic B -> X_u decays and we resum the threshold logarithms to next-to-leading order. From this (triple-differential) distribution, any other distribution is obtained by integration. ... More
Cancellation of power enhancements in non-spectator decaysDec 06 1993Exclusive non-spectator decay rates of beauty hadrons contain power enhancements of the form (m_b/m)^2 and m_b/m, where m_b is the b-quark mass and m is a light quark mass. An implicit argument has been recently given according to which these singularities ... More
Introduction to Perturbative QCDMay 09 1997This is a written version of two lectures given at the First School on Field Theory and Gravitation in Vitoria (Brasil) April 15-19, 1997. We discuss the foundation of QCD as the theory of strong interactions and the perturbative analysis of e^+e^- annihilation ... More
Monte Carlo Simulations for Top Pair and Single Top Production at the TevatronJul 29 2008Monte Carlo (MC) simulations are indispensable tools for top quark physics, both at the current Tevatron collider and the upcoming Large Hadron Collider. In this paper we review how the Tevatron experiments CDF and D0 utilize MC simulations for top quark ... More
Non-perturbative renormalization of Phi-derivable approximations in theories with multiple fieldsOct 28 2005Jun 14 2006We provide a renormalization procedure for Phi-derivable approximations in theories coupling different types of fields. We illustrate our approach on a scalar phi^4 theory coupled to fermions via a Yukawa-like interaction. The non-perturbative renormalization ... More
On the dynamics of spin systems with a general ground stateApr 06 2005Oct 05 2006The paper is withdrawn by the author due to a recently discovered flaw in a basic proof.
On the significance of quantum phase transitions for the apparent universality of Bloch laws for M_s(T)Nov 21 2002Oct 12 2006The paper is withdrawn by the author because it is superseded by cond-mat/0303357 .
Why is Bloch's T^(3/2)-law also observed in d=2 dimensions ?Oct 30 2002Oct 11 2006The paper is withdrawn by the author because it is superseded by cond-mat/0303357 .
Precision Top Mass Measurements vs. Yukawa Unification PredictionsOct 14 1996How accurately should the top quark mass be measured in order to test theoretical predictions? A possible answer is presented within a particular theoretical framework, that of top-bottom-tau Yukawa unification in a supersymmetric SO(10) grand unified ... More
Probing Electroweak Top Quark Couplings at Hadron and Lepton CollidersAug 12 2005The International Linear Collider (ILC) will be able to precisely measure the electroweak couplings of the top in e+e- -> tt~. We compare the limits which can be achieved at the ILC with those which can be obtained in tt~gamma$ and tt~Z production at ... More
Measuring Trilinear Gauge Boson Couplings at Hadron and Lepton CollidersDec 19 1997We discuss the measurement of the $WWV$ ($V=\gamma,\, Z$) gauge boson couplings in present and future collider experiments. The major goals of such experiments will be the confirmation of the Standard Model (SM) predictions and the search for signals ... More
Self-Couplings of Electroweak Bosons: Theoretical Aspects and Tests at Hadron CollidersOct 11 1995The current theoretical understanding of anomalous gauge boson couplings is reviewed, and the direct measurement of these couplings in present and future hadron collider experiments is briefly discussed.
Equivariant torsion and G-CW-complexesNov 14 1997For any compact Lie group G we discuss the relation of the equivariant Reidemeister and analytic torsion of G-manifolds with their G-CW structures.
On the nature of Mersenne fluctuationsSep 20 2013Oct 07 2016The article introduces crotons, multifaceted pre-geometric objects that occur both as labels encoded on the boundary of a "volume" and as complementary aspects of geometric fluctuations within that volume. If you think of crotons as linear combinations, ... More