Related papers: Redacted

This paper has been withdrawn by the author because the conclusions reached in it are incorrect.

This paper has been withdrawn because the content has been substantially improved in a later paper, arXiv:0806.1165.

Redacted by arXiv admins

This paper has been withdrawn by the author due to text overlap with arXiv:1102.5004, as well as omission of proper citations to arXiv:1110.4655 and arXiv:1111.0313

This paper has been withdrawn by the author due to similarity to Author's other paper

This article has been replaced by arXiv:0807.3093

Paper has been withdrawn.

This submission has been withdrawn at the request of the author.

This paper has been withdrawn by the author due a few mistakes in the paper.

This paper was removed by arXiv admin due to 94% plagiarism from uncited reference hep-th/0507153.

This paper has been withdrawn by the author: it was a too preliminary version.

This paper was withdrawn by arXiv admin due to authors' misrepresentation of identity/affiliation.

This submission has been withdrawn by the author.

The authors are not satisfied about the analysis.

The paper was retracted.

This paper has been withdrawn by the author due to extremely unscientific errors.

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors.

This paper has been withdrawn by the author: it was a too preliminary version

This paper has been removed by arXiv administrators because it plagiarizes gr-qc/0203084, gr-qc/0607138, gr-qc/0011087, gr-qc/0102070, gr-qc/0607138, gr-qc/0109017, gr-qc/0212018, and gr-qc/9409039.