Spherically symmetric dark energy structures in the context of Chaplygin gas model

This paper investigates the existence of spherically symmetrical dark energy structures under the context of Chaplygin gas. A scaling solution of the form r -2/3 is found for the density and then we calculated the corresponding rotational curve and it turns out to be unrealistic implying that such objects don't exist. Finally we modified the equation of state of the Chaplygin gas to an equation of state of the form P = (j 2 P - A and compared p with observational data to see to what physical extent this equation works and it isdetermined that it works as far as a couple of hundred Mpc while the physical length of galaxies is in Kpc. implying the modified Chaplygin equation fits the observed rotational curves.

Grantor dc:publisher.institution

Department of Physics

Year dc:date.issued

2006

Author dc:creator

• Tekola, Abiy G

Advisors dc:contributor.advisor

• Tupper, Gary B
• Viollier, Raoul D

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/11427/6518

OAI identifier oai:identifier

oai:open.uct.ac.za:11427/6518