2 papers
math-ph2025
Degree of freedom count in linear gauge invariant PDE systems
Simon Lyakhovich, Dmitri Piontkovski
We consider not necessarily Lagrangian partial linear differential equations (PDE) with constant coefficients. Einstein proposed a definition of the"strength" of such a field theor…
math-ph2024
Gauge symmetry and partially Lagrangian systems
Simon Lyakhovich, Nikita Sinelnikov
We consider a classical field theory whose equations of motion follow from the least action principle, but the class of admissible trajectories is restricted by differential equati…