Mathematics
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988cqgra...5l..47l&link_type=abstract
Classical and Quantum Gravity (ISSN 0264-9381), vol. 5, Feb. 1, 1988, p. L47-L51. CNPq-supported research.
Mathematics
13
Chaos, Cosmology, Domain Wall, Einstein Equations, String Theory, Superposition (Mathematics), Gravitational Effects, Scalars, Singularity (Mathematics)
Scientific paper
The solutions to the Einstein equations representing the superposition of a particle and a ring are studied. The appearance of strut-type and membrane-type singularities is analyzed. These objects are compared with cosmic strings and domain walls. It is found that, unlike the usual domain walls, the membranes have null effective gravitational mass, as have struts and strings. The relationship of these membranes with walls associated with sigma-model-type field theories is indicated.
Letelier Patricio S.
Oliveira Samuel R.
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