Traversability in relation with tides across thin-shell wormholes is analyzed. Conditions for a safe travel through wormhole throat are established terms of the parameters characterizing geometries and reasonable assumptions regarding travellers motion. Most convenient turn to include physically interesting example connecting locally flat submanifolds as those associated gauge cosmic strings. A...

There are several possible choices of the time parameter for canonical description a self-gravitating thin shell, but quantum thories built on different parameters lead to unitarily inequivalent descriptions. We compare collapse dust shell in two times {\it viz.,} coordinate interior (originally addressed \cite{hajicek92a}) and comoving observer (proper time). In each case, we obtain exact solu...

During its early evolution, a pulsar wind nebula (PWN) sweeps the inner part of supernova ejecta and forms thin massive shell. Later on, when shell has been reached by reverse shock remnant, evolution becomes more complex, in most cases reverting expansion into compression: this later phase is called "reverberation". Computations done so far to understand have mostly performed thin-shell approx...