27 citations · 94 across the 15 of their papers we have counts for
15 papers
Lindbladian quantization of mechanical systems with nonholonomic constraints
Daniel Schubring, Sriram Ganeshan
Nonholonomic mechanics describes systems subject to non-integrable velocity constraints, such as rolling bodies and skating motion. These systems generally lack a canonical Hamilto…
Loop diagrams in the kinetic theory of waves
Vladimir Rosenhaus, Daniel Schubring, Md Shaikot Jahan Shuvo +1
Recent work has given a systematic way for studying the kinetics of classical weakly interacting waves beyond leading order, having analogies with renormalization in quantum field…
Classical and quantum aspects of non-linear sigma models with a squashed sphere target space
Daniel Schubring
Various aspects of non-linear sigma models with an symmetric target space are considered. In the case , three-dimensional topological defects are discussed…
Skyrmions and Hopfions in 3D Frustrated Magnets
Carlos Naya, Daniel Schubring, Mikhail Shifman +1
A model of an inversion-symmetric frustrated spin system is introduced which hosts three-dimensional extensions of magnetic Skyrmions. In the continuum approximation this model red…
The Yukawa interaction in ordinary quantum mechanics
Daniel Schubring
The Yukawa interaction is considered in 0+1 dimensions as a pedagogical example to illustrate quantum field theory methods. From the quantum mechanical point of view the system is…
Lessons from models in one dimension
Daniel Schubring
Various topics related to the model in one spacetime dimension (i.e. ordinary quantum mechanics) are considered. The focus is on a pedagogical presentation of quantum field…
Treating Divergent Perturbation Theory: Lessons from Exactly Solvable 2D Models at Large
Daniel Schubring, Chao-Hsiang Sheu, Mikhail Shifman
We consider the operator product expansion (OPE) of correlation functions in the supersymmetric non-linear sigma model at sub-leading order in the large limit in order t…
Sigma model on a squashed sphere with a Wess-Zumino term
Daniel Schubring, Mikhail Shifman
A class of two-dimensional sigma models interpolating between and the principal chiral model is discussed. We add the Wess-Zumino-Novikov-Witten term and examine the…
Interpolating Between and Target Spaces
Daniel Schubring, Mikhail Shifman
Some magnetic phenomena in correlated electron systems were recently shown to be described in the continuum limit by a class of sigma models which present a U(1) Hopf fibration ove…
Dissipative String Fluids
Daniel Schubring
Systems of interacting networks of strings such as cosmic strings or quantum vortices can be approximated in a certain regime as an anisotropic fluid with an equation of state depe…
Field Theory for Perfect String Fluids
Daniel Schubring, Vitaly Vanchurin
We develop a field theory description of non-dissipative string fluids and construct an explicit mapping between field theory degrees of freedom and hydrodynamic variables. The the…
String Fluid in Local Equilibrium
Daniel Schubring, Vitaly Vanchurin
We study the solutions of string fluid equations under assumption of a local equilibrium which was previously obtained in the context of the kinetic theory. We show that the fluid…
Transport Equation for Nambu-Goto Strings
Daniel Schubring, Vitaly Vanchurin
We consider a covariant approach to coarse-graining a network of interacting Nambu-Goto strings. A transport equation is constructed for a spatially flat Friedmann universe. In Min…
Fluid Mechanics of Strings
Daniel Schubring, Vitaly Vanchurin
We consider conserved currents in an interacting network of one-dimensional objects (or strings). Singular currents localized on a single string are considered in general, and a fo…
Density-Independent Model of Self-Propelled Particles
Daniel Schubring, Paul R. Ohmann
We examine a density-independent modification of the Vicsek model in which a particle interacts with neighbors defined by Delaunay triangulation. To feasibly simulate the model, an…