morteza soltani

Particle Creation in Presence of Medium

In this work particle creation is extended to a dissipative massless scalar field in 1+1 dimension satisfying a Robin boundary condition(BC) at a non-relativistic moving boundary. For this purpose we define a Lagrangian for scalar field and then constitutive equations for the scalar field and medium are
obtained as the Euler-Lagrange equations using the Lagrangian of a total system. We derive input and output bosonic field operators. Which allows us to calculate the spectral distribution of created particles. In addition we applied our result for particle creation in presence of a dissipative medium by using Lorentzoscillator model of medium. And we will show that particle emission in presence of medium for Dirichlet boundary condition can be considerably increased and for Neumann one it can be decreased.