Mathematics – Logic
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jmp....35.2423b&link_type=abstract
Journal of Mathematical Physics, Vol. 35, No. 5, p. 2423 - 2429
Mathematics
Logic
Cosmological Models: Space-Time
Scientific paper
Study of radial and circular geodesics including those of tachyons in two spherically symmetric vacuum five-dimensional space-time is done. One of them is of Schwarzschild type and the other the so-called soliton solution. The authors obtain results which are different from the usual analogous four-dimensional (4D) ones. It is found that all the circular geodesics irrespective of whether they are timelike, null, or spacelike will be stable in the region r > 6 M. It has also been shown that in a homogeneous cosmological model where the isotropic 3 space expands but the extra space contracts with time, the existence of tachyon is possible. This is in contradiction to the analogous 4D result obtained previously.
Banerjee Anindita
Chatterjee Saikat
Sil Arunansu
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