|
| |
FIZIKA B 14 (2005) 3, 327 - 332
 
SEMI-CLASSICAL GRAVITATIONAL EFFECTS NEAR COSMIC STRING IN LYRA
GEOMETRY
F. RAHAMAN, S. MAL, S. SHEKHAR, P. GHOSH and T. RAY
Department of Mathematics, Jadavpur University, Kolkata-700032, India
E-mail address: [email protected]
Received 13 February 2003;
Accepted 6 June 2005
Online 16 February 2005
In recent past, W. A. Hiscock [Phys. Lett. B 188 (1987) 317] studied the semi-classical
gravitational effects near cosmic strings. He obtained the vacuum expectation value of the
stress-energy tensor of an arbitrary collection of conformal massless free-quantum fields
(scalar, spinor and vectors) in the presence of a static, cylindrically symmetric cosmic
string. With this stress-energy tensor, we study the semi-classical gravitational effects
of a cosmic string in the context of Lyra geometry.
PACS numbers: 98.80.Cq, 11.27.+d, 04.50.+h
UDC 539.12
Keywords: cosmic string, gravitational effects, semi-classical approach, Lyra geometry
|
