Centro de Excelencia Severo Ochoa
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IFT Seminar Room/Red Room
The role of the exact solutions in gravitational theories is impossible to overestimate. But the intrinsically
nonlinear character of gravitational equations makes solving them a very difficult and problemtic task.
This is why the investigations of the hypersurfaces where the matter energy-momentum tensor undergoes some discontinuities are so important. The physically interesting discontinuities are jumps (they can be viewed as an idealization of the shock waves) and thin shells (i.e., $\delta$-function distributions, describing some
idealized matter sources including the potential barriers between two different phases during cosmological phase
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