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자연과학대학
수학전공
Journal papers
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Singularities in geodesic surface congruence
Title
Singularities in geodesic surface congruence
Authors
Cho Y.S.
;
Hong S.-T.
Ewha Authors
조용승
;
홍순태
SCOPUS Author ID
조용승
; 홍순태
Issue Date
2008
Journal Title
Physical Review D - Particles, Fields, Gravitation and Cosmology
ISSN
1550-7998
Citation
Physical Review D - Particles, Fields, Gravitation and Cosmology vol. 78, no. 6
Indexed
SCIE; SCOPUS
Document Type
Article
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
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