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Singularities in geodesic surface congruence

Title
Singularities in geodesic surface congruence
Authors
Cho Y.S.Hong S.-T.
Ewha Authors
조용승홍순태
SCOPUS Author ID
조용승scopus; 홍순태scopus
Issue Date
2008
Journal Title
Physical Review D - Particles, Fields, Gravitation and Cosmology
ISSN
1550-7998JCR Link
Citation
vol. 78, no. 6
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
In the stringy cosmology, we investigate singularities in geodesic surface congruences for the timelike and null strings to yield the Raychaudhuri type equations possessing correction terms associated with the novel features owing to the strings. Assuming the stringy strong energy condition, we have a Hawking-Penrose type inequality equation. If the initial expansion is negative so that the congruence is converging, we show that the expansion must pass through the singularity within a proper time. We observe that the stringy strong energy conditions of both the timelike and null string congruences produce the same inequality equation. © 2008 The American Physical Society.
DOI
10.1103/PhysRevD.78.067301
Appears in Collections:
자연과학대학 > 수학전공 > Journal papers
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