Journal
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
Volume 20, Issue 12, Pages 2369-2381Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S021827181102041X
Keywords
Ghost; dark energy; instability
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Funding
- Research Institute for Astronomy and Astrophysics of Maragha, Iran
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We investigate the instability of the ghost dark energy model against perturbations in different cases. To this goal we use the squared sound speed v(s)(2) whose sign determines the stability of the model. When v(s)(2) < 0 the model is unstable against perturbation. At first we discuss the noninteracting ghost dark energy model in a flat FRW universe and find out that such a model is unstable due to the negativity of the v(s)(2) in all epoches. The interacting ghost dark energy model in both flat and nonflat universe are studied in the next parts and in both cases we find that the squared sound speed of ghost dark energy is always negative. This implies that the perfect fluid for ghost dark energy is classically unstable against perturbations. In both flat and non flat cases we find that the instability of the model increases with increasing the value of the interacting coupling parameter.
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