3 papers
math-ph2026
Boundaries in the Instantaneous Formulation of Field Theories
Silvester G. A. Borsboom
We study boundary conditions in GiMmsy's covariant and instantaneous formulations of classical field theories and show that the instantaneous state space in the presence of a const…
hep-th2026
Black hole equations of state and response functions
Silvester G. A. Borsboom, Manus R. Visser
We systematically develop a framework for equilibrium thermodynamics in terms of thermodynamic representations, which are choices of thermodynamic potential and independent variabl…
physics.hist-ph2026
Symmetry Breaking through Superselection by Boundary Conditions
Silvester G. A. Borsboom, José P. Dupont
Spontaneous symmetry breaking (SSB) is central to modern physics but is conventionally defined only for infinite systems, raising challenges for its interpretation in finite, real-…