Publications (68)
Mode-coupling theory for structural and conformational dynamics of polymer melts
S. -H. Chong, M. Fuchs
A mode-coupling theory for dense polymeric systems is developed which unifyingly incorporates the segmental cage effect relevant for structural slowing down and polymer chain confo…
Rheology, Structure and Dynamics of Colloid-Polymer Mixtures: from Liquids to Gels
M. Laurati, G. Petekidis, N. Koumakis +5
We investigated the viscoelastic properties of colloid-polymer mixtures at intermediate colloid volume fraction and varying polymer concentrations, thereby tuning the attractive in…
A First-Principles Constitutive Equation for Suspension Rheology
J. M. Brader, M. E. Cates, M. Fuchs
Using mode-coupling theory, we derive a constitutive equation for the nonlinear rheology of dense colloidal suspensions under arbitrary time-dependent homogeneous flow. Generalizin…
Nonergodicity transitions in colloidal suspensions with attractive interactions
J. Bergenholtz, M. Fuchs
The colloidal gel and glass transitions are investigated using the idealized mode coupling theory (MCT) for model systems characterized by short-range attractive interactions. Resu…
Structural relaxation in orthoterphenyl: a schematic mode coupling theory model analysis
A. P. Singh, G. Li, W. G"otze +3
Depolarized light scattering spectra of orthoterphenyl showing the emergence of the structural relaxation below the oscillatory microscopic excitations are described by solutions o…
Describing static correlation in bond dissociation by Kohn-Sham density functional theory
M. Fuchs, Y. -M. Niquet, X. Gonze +1
We show that density functional theory within the RPA (random phase approximation for the exchange-correlation energy) provides a correct description of bond dissociation in H…
Modification of the -Meson Lifetime in Nuclear Matter
M. Kotulla, D. Trnka, P. Mühlich +65
The photo production of mesons on the nuclei C, Ca, Nb and Pb has been measured using the Crystal Barrel/TAPS detector at the ELSA tagged photon facility in Bonn. The dependen…
Lessons learned while developing the Serenity-S1 ATCA card
T. Mehner, L. E. Ardila-Perez, M. Balzer +17
The Serenity-S1 is a Xilinx Virtex Ultrascale+ based Advanced Telecommunications Computing Architecture (ATCA) processing blade that has been optimised for production. It incorpora…
Photoproduction of mesons on nuclei near the production threshold
M. Nanova, J. Weil, S. Friedrich +67
The photoproduction of mesons on LH_2, C and Nb has been studied for incident photon energies from 900 to 1300 MeV using the CB/TAPS detector at ELSA. The line shape does…
Residual Stresses in Glasses
M. Ballauff, J. M. Brader, S. U. Egelhaaf +10
The history dependence of the glasses formed from flow-melted steady states by a sudden cessation of the shear rate is studied in colloidal suspensions, by molecular dynam…
Higher order glass-transition singularities in colloidal systems with attractive interactions
K. Dawson, G. Foffi, M. Fuchs +6
The transition from a liquid to a glass in colloidal suspensions of particles interacting through a hard core plus an attractive square-well potential is studied within the mode-co…
Structure and thermodynamics of colloid-polymer mixtures: a macromolecular approach
M. Fuchs, K. S. Schweizer
The change of the structure of concentrated colloidal suspensions upon addition of non-adsorbing polymer is studied within a two-component, Ornstein-Zernicke based liquid state app…
Linearly polarised photon beams at ELSA and measurement of the beam asymmetry in pi^0-photoproduction off the proton
D. Elsner, B. Bantes, O. Bartholomy +55
At the electron accelerator ELSA a linearly polarised tagged photon beam is produced by coherent bremsstrahlung off a diamond crystal. Orientation and energy range of the linear po…
First-Principles Constitutive Equation for Suspension Rheology
J. M. Brader, M. E. Cates, M. Fuchs
We provide a detailed derivation of a recently developed first-principles approach to calculating averages in systems of interacting, spherical Brownian particles under time-depend…
MAGIC upper limits on the very high energy emission from GRBs
J. Albert, E. Aliu, H. Anderhub +57
The fast repositioning system of the MAGIC Telescope has allowed during its first data cycle, between 2005 and the beginning of year 2006, observing nine different GRBs as possible…
Linear colliders based on laser-plasma accelerators
C. Benedetti, S. S. Bulanov, E. Esarey +40
White paper to the Proceedings of the U.S. Particle Physics Community Planning Exercise (Snowmass 2021): Linear colliders based on laser-plasma accelerators
Photoproduction of and Mesons off Protons
The CBELSA, TAPS Collaboration, : +69
Total and differential cross sections for and photoproduction off the proton have been determined with the CBELSA/TAPS detector for photon energies between 0.85 an…
Light scattering spectra of supercooled molecular liquids
T. Franosch, M. Fuchs, A. Latz
The light scattering spectra of molecular liquids are derived within a generalized hydrodynamics. The wave vector and scattering angle dependences are given in the most general cas…
Nonlinear microrheology with time-dependent forces -- Application to recoils in viscoelastic fluids
Nikolas Ditz, Antonio M. Puertas, M. Fuchs
This work presents a theoretical analysis of the motion of a tracer colloid driven by a time-dependent force through a viscoelastic fluid. The recoil of the colloid after applicati…
Asymptotic laws for tagged-particle motion in glassy systems
M. Fuchs, W. Götze, M. R. Mayr
Within the mode-coupling theory for structural relaxation in simple systems the asymptotic laws and their leading-asymptotic correction formulas are derived for the motion of a tag…
Dynamic Glass Transition in Two Dimensions
M. Bayer, J. Brader, F. Ebert +6
The question about the existence of a structural glass transition in two dimensions is studied using mode coupling theory (MCT). We determine the explicit d-dependence of the memor…
Inter-molecular structure factors of macromolecules in solution: integral equation results
M. Fuchs, M. Müller
The inter-molecular structure of semidilute polymer solutions is studied theoretically. The low density limit of a generalized Ornstein-Zernicke integral equation approach to polym…
Active and Nonlinear Microrheology in Dense Colloidal Suspensions
I. Gazuz, A. M. Puertas, Th. Voigtmann +1
We present a first-principles theory for the active nonlinear microrheology of colloidal model systems: for constant external force on a spherical probe particle embedded in a dens…
Glass Rheology: From mode-coupling theory to a dynamical yield criterion
J. M. Brader, Th. Voigtmann, M. Fuchs +2
The mode coupling theory (MCT) of glasses, while offering an incomplete description of glass transition physics, represents the only established route to first-principles predictio…
ZynqMP-based board-management mezzanines for Serenity ATCA-blades
T. Mehner, L. E. Ardila-Perez, M. N. Balzer +10
In the context of the CMS Phase-2 tracker back-end processing system, two mezzanines based on the Zynq Ultrascale+ Multi-Processor System-on-Chip (MPSoC) device have been developed…
Snowmass Whitepaper AF6: Plasma-Based Particle Sources
M. Fuchs, B. A. Shadwick, N. Vafaei-Najafabadi +9
High-brightness beams generated by particle sources based on advanced accelerator concepts have the potential to become an essential part of future accelerator technology. High-gra…
Hard discs under steady shear: comparison of Brownian dynamics simulations and mode coupling theory
O. Henrich, F. Weysser, M. E. Cates +1
Brownian dynamics simulations of bidisperse hard discs moving in two dimensions in a given steady and homogeneous shear flow are presented close to and above the glasstransition de…
Stress-strain relations in bulk metallic glasses and colloidal dispersions
C. P. Amann, M. Ballauff, S. U. Egelhaaf +9
A comparison is made between the nonlinear rheological response of bulk metallic glass formers and of colloidal dispersions. Stress-strain curves measured after switch-on of consta…
Statistical mechanics derivation of hydrodynamic boundary conditions: the diffusion equation
M. Fuchs, K. Kroy
Considering the example of interacting Brownian particles we present a linear response derivation of the boundary condition for the corresponding hydrodynamic description (the diff…
Tagged-particle dynamics in a hard-sphere system: mode-coupling theory analysis
Th. Voigtmann, A. M. Puertas, M. Fuchs
The predictions of the mode-coupling theory of the glass transition (MCT) for the tagged-particle density-correlation functions and the mean-squared displacement curves are compare…
From Equilibrium to Steady State: The Transient Dynamics of Colloidal Liquids under Shear
J. Zausch, J. Horbach, M Laurati +4
We investigate stresses and particle motion during the start up of flow in a colloidal dispersion close to arrest into a glassy state. A combination of molecular dynamics simulatio…
Multiple Fourier Component Analysis of X-ray Second Harmonic Generation in Diamond
P. Chakraborti, B. Senfftleben, B. Kettle +13
The unprecedented brilliance of X-ray free-electron lasers (XFELs) [1, 2] has enabled first studies of nonlinear interactions in the hard X-ray range. In particular, X-ray-optical…
In-medium mass from the reaction
TAPS Collaboration, M. Nanova, V. Metag +65
Data on the photoproduction of mesons on nuclei have been re-analyzed in a search for in-medium modifications. The data were taken with the Crystal Barrel(CB)/TAPS detector sy…
Observation of a unitary cusp in the threshold γp -> Ï^{0}p reaction
A. M. Bernstein, E. Shuster, R. Beck +4
A rigorous multipole analysis of the recent γp -> Ï^{0}p cross section measurement is presented. The data were taken using the photon spectrometer TAPS at the tagged photon beam…
Photoproduction of meson pairs: First measurement of the polarization observable I^s
E. Gutz, V. Sokhoyan, H. van Pee +64
The polarization observable I^s, a feature exclusive to the acoplanar kinematics of multi-meson final states produced via linearly polarized photons, has been measured for the firs…
Schematic Mode Coupling Theory of Glass Rheology: Single and Double Step Strains
Th. Voigtmann, J. M. Brader, M. Fuchs +1
Mode coupling theory (MCT) has had notable successes in addressing the rheology of hard-sphere colloidal glasses, and also soft colloidal glasses such as star-polymers. Here, we ex…
Photoproduction of eta-mesons off nuclei for Eg < 2.2 GeV
T. Mertens, I. Jaegle, P. Muehlich +69
Photoproduction of mesons off C, Ca, Nb, and Pb nuclei has been measured with a tagged photon beam with energies between 0.6 and 2.2 GeV. The expe…
The MAGIC Project: Contributions to ICRC 2007
J. Albert, E. Aliu, H. Anderhub +142
The MAGIC Project: Contributions to ICRC 2007, Merida, Mexico. Contents pages for the Contribution on behalf of the MAGIC Collaboration to the 30th ICRC that took place in July 200…
High statistics study of the reaction
V. Sokhoyan, E. Gutz, V. Crede +62
The photoproduction of 2 mesons off protons was studied with the Crystal Barrel/TAPS experiment at the electron accelerator ELSA in Bonn. The energy of photons produced in a…
Role of semicore states in the electronic structure of group-III nitrides: An exact exchange study
A. Qteish, A. I. Al-Sharif, M. Fuchs +3
The bandstructure of the zinc-blende phase of AlN, GaN, InN is calculated employing the exact-exchange (EXX) Kohn-Sham density-functional theory and a pseudopotential plane-wave ap…
Transparency ratio in γA -> η' A' and the in-medium η' width
M. Nanova, V. Metag, A. Ramos +58
The photoproduction of η'-mesons off different nuclei has been measured with the CBELSA/TAPS detector system for incident photon energies between 1500 - 2200 MeV. The transparency…
A First-Principles Constitutive Equation for Suspension Rheology: Supplementary Material
J. M. Brader, M. E. Cates, M. Fuchs
Additional supplementary material for the paper `A First-Principles Constitutive Equation for Suspension Rheology'.
Jamming transitions in a schematic model of suspension rheology
C. B. Holmes, M. Fuchs, M. E. Cates
We study the steady-state response to applied stress in a simple scalar model of sheared colloids. Our model is based on a schematic (F2) model of the glass transition, with a memo…
Photoproduction of Ï Mesons off the Proton
A. Wilson, V. Crede, A. V. Anisovich +62
The differential cross sections and unpolarized spin-density matrix elements for the reaction were measured using the CBELSA/TAPS experiment for initial photon energie…
Design considerations for table-top, laser-based VUV and X-ray free electron lasers
F. Grüner, S. Becker, U. Schramm +12
A recent breakthrough in laser-plasma accelerators, based upon ultrashort high-intensity lasers, demonstrated the generation of quasi-monoenergetic GeV-electrons. With future Petaw…
Bond formation and slow heterogeneous dynamics in adhesive spheres with long--ranged repulsion: Quantitative test of Mode Coupling Theory
O. Henrich, A. M. Puertas, M. Sperl +2
A colloidal system of spheres interacting with both a deep and narrow attractive potential and a shallow long-ranged barrier exhibits a prepeak in the static structure factor. This…
N* and Delta* decays into N pi0 pi0
U. Thoma, M. Fuchs, A. V. Anisovich +45
Decays of baryon resonances in the second and the third resonance region into N pi0 pi0 are studied by photoproduction of two neutral pions off protons. Partial decay widths of N*…
Equations of structural relaxation
M. Fuchs, Th. Voigtmann
In the mode coupling theory of the liquid to glass transition the long time structural relaxation follows from equations solely determined by equilibrium structural parameters. The…
Flow curves of colloidal dispersions close to the glass transition: Asymptotic scaling laws in a schematic model of mode coupling theory
D. Hajnal, M. Fuchs
The flow curves, viz. the curves of stationary stress under steady shearing, are obtained close to the glass transition in dense colloidal dispersions using asymptotic expansions i…
Characterization and Tuning of Ultra High Gradient Permanent Magnet Quadrupoles
S. Becker, M. Bussmann, S. Raith +9
The application of quadrupole-devices with high field gradients and small apertures requires precise control over higher order multipole field components. We present a new scheme f…
Nonlinear response of dense colloidal suspensions under oscillatory shear: Mode-coupling theory and FT-rheology experiments
J. M. Brader, M. Siebenbuerger, M. Ballauff +5
Using a combination of theory, experiment and simulation we investigate the nonlinear response of dense colloidal suspensions to large amplitude oscillatory shear flow. The time-de…
Macromolecular theory of solvation and structure in mixtures of colloids and polymers
M. Fuchs, K. S. Schweizer
The structural and thermodynamic properties of mixtures of colloidal spheres and non-adsorbing polymer chains are studied within a novel general two-component macromolecular liquid…
Structural relaxation of polydisperse hard spheres: comparison of the mode-coupling theory to a Langevin dynamics simulation
F. Weysser, A. M. Puertas, M. Fuchs +1
We analyze the slow, glassy structural relaxation as measured through collective and tagged-particle density correlation functions obtained from Brownian dynamics simulations for a…
Quasi-free photoproduction of eta-mesons of the neutron
I. Jaegle, T. Mertens, A. V. Anisovich +69
Quasi-free photoproduction of eta-mesons off nucleons bound in the deuteron has been measured with the CBELSA/TAPS detector for incident photon energies up to 2.5 GeV at the Bonn E…
Competition between glass transition and liquid-gas separation in attracting colloids
A. M. Puertas, M. Fuchs, M. E. Cates
We present simulation results addressing the phenomena of colloidal gelation induced by attractive interactions. The liquid-gas transition is prevented by the glass arrest at high…
Aspects of the dynamics of colloidal suspensions: Further results of the mode-coupling theory of structural relaxation
M. Fuchs, M. R. Mayr
Results of the idealized mode-coupling theory for the structural relaxation in suspensions of hard-sphere colloidal particles are presented and discussed with regard to recent ligh…
Report on the Advanced Linear Collider Study Group (ALEGRO) Workshop 2026
L. Verra, P. Muggli, B. Cross +56
The 7th ALEGRO workshop, hosted by INFN Frascati National Laboratories from 3rd to 5th March 2026, brought together the international Advanced Novel Accelerators (ANA) community to…
Theory and simulation of gelation, arrest and yielding in attracting colloids
M. E. Cates, M. Fuchs, K. Kroy +2
We present some recent theory and simulation results addressing the phenomena of colloidal gelation at both high and low volume fractions, in the presence of short-range attractive…
Gel transitions in colloidal suspensions
J. Bergenholtz, M. Fuchs
The idealized mode coupling theory (MCT) is applied to colloidal systems interacting via short-range attractive interactions of Yukawa form. At low temperatures MCT predicts a slow…
Theory of Thermodynamic Stresses in Colloidal Dispersions at the Glass Transition
D. Hajnal, O. Henrich, J. J. Crassous +4
We discuss the nonlinear rheology of dense colloidal dispersions at the glass transition. A first principles approach starting with interacting Brownian particles in given arbitrar…
Colloidal gelation and non-ergodicity transitions
J. Bergenholtz, M. Fuchs, Th. Voigtmann
Within the framework of the mode coupling theory (MCT) of structural relaxation, mechanisms and properties of non-ergodicity transitions in rather dilute suspensions of colloidal p…
The direct correlation function of a crystalline solid
S. -C. Lin, M. Oettel, J. M. Hring +3
Direct correlation functions (DCFs), linked to the second functional derivative of the free energy with respect to the one-particle density, play a fundamental role in a statistica…
Cooperation between Top-Down and Bottom-Up Theorem Provers
M. Fuchs, D. Fuchs
Top-down and bottom-up theorem proving approaches each have specific advantages and disadvantages. Bottom-up provers profit from strong redundancy control but suffer from the lack…
Shear stresses of colloidal dispersions at the glass transition in equilibrium and in flow
J. J. Crassous, M. Siebenbürger, M. Ballauff +4
We consider a model dense colloidal dispersion at the glass transition, and investigate the connection between equilibrium stress fluctuations, seen in linear shear moduli, and the…
Schematic mode coupling theories for shear thinning, shear thickening, and jamming
M. E. Cates, C. B. Holmes, M. Fuchs +1
Mode coupling theory (MCT) appears to explain several, though not all, aspects of the glass transition in colloids (particularly when short-range attractions are present). Developm…
Cratering of Soil by Impinging Jets of Gas, with Application to Landing Rockets on Planetary Surfaces
Philip T. Metzger, Bruce T. Vu, D. E. Taylor +9
Several physical mechanisms are involved in excavating granular materials beneath a vertical jet of gas. These occur, for example, beneath the exhaust plume of a rocket landing on…
Direct measurement of time-dependent density-density correlations in a solid through the acoustic analog of the dynamical Casimir effect
M. Trigo, M. Fuchs, J. Chen +20
The macroscopic characteristics of a solid, such as its thermal, optical or transport properties are determined by the available microscopic states above its lowest energy level. T…
Dense colloidal suspensions under time-dependent shear
J. M. Brader, T. Voigtmann, M. E. Cates +1
We consider the nonlinear rheology of dense colloidal suspensions under a time-dependent simple shear flow. Starting from the Smoluchowski equation for interacting Brownian particl…