[4]Hinshaw G et al 2008 arXiv:0803.0732[astro-ph]

[5]Komatsu E and Dunkley J et al 2008
arXiv:0803.0547[astro-ph]

[6]Perlmutter S et al 2003 Astrophys. J. 598 102
[arXiv:astro-ph/0309368]

[7]Carroll S M 2001 Living Rev. Rel. 4 1
[arXiv:astro-ph/0004075]

[8]Peebles P J E and Ratra B 2003 Rev. Modern Phys.
75 559 [arXiv:astro-ph/0207347]

[9]Caldwell R R, Dave R and Steinhardt P J 1998 Phys.
Rev. Lett. 80 1582 [arXiv:astro-ph/9708069]

[10]Peebles P J E and Ratra B 1998 Astrophys. J.
325 L17

[11]Caldwell R R 2002 Phys. Lett. B 545 23
[arXiv:astro-ph/9908168]

[12]Carroll S M, Hoffman M and Trodden M 2003 Phys. Rev.
D 68 023509 [arXiv:astro-ph/0301273]

[13]Alam U and Sahni V 2002 [arXiv:astro-ph/0209443]

[14]Kamenshchik A, Moschella U and Pasquier V 2001 Phys.
Lett. B 511 265 [arXiv:gr-qc/0103004]

[15]Zhu Z 2004 Astron Astrophys. 423 421
[arXiv:astro-ph/0411039]

[16]Bilic N, Tupper G B and Viollier R D 2002 Phys.
Lett. B 535 17 [arXiv:astro-ph/0111325]

[17]Bento M C, Bertolami O and Sen A A 2002 Phys. Rev. D
66 043507 [arXiv:gr-qc/0202064]

[18] Li M 2004 Phys. Lett. B 603 1
[arXiv:hep-th/0403127]

[19]Huang Q G and Li M 2004 J. Cosmol. Astropart. Phys.
0408 013 {[arXiv:astro-ph/0404229]

[20]Li M, Lin C S and Wang Y 2008 J. Cosmol. Astropart.
Phys. 05 023 arXiv:0801.1407[astro-ph]

[21]Cohen A, Kaplan D and Nelson A 1999 Phys. Rev. Lett.
82 4971 [arXiv:hep-th/9803132]

[22]Wang B, Gong Y G and Abdalla E 2005 Phys. Lett. B
624 141 [arXiv:hep-th/0506069]

[23]Benaoum H B 2002 [arXiv:hep-th/0205140]

[24]Chimento L P 2004 Phys. Rev. D 69 123517
[arXiv:astro-ph/0311613]

[25]Chimento L P and Lazkoz R 2005 Phys. Lett. B
615 146-152 [arXiv:astro-ph/0411068]

[26]Debnath U, Banerjee A and Chakraborty S 2004 Class.
Quant. Grav. 21 5609 [arXiv:gr-qc/0411015]

[27]Wu Y B and Li S et al 2007 Mod. Phys. Lett. A
22 783

[28]Wu Y B and Li S et al 2007 Gen. Relat. Grav.
39 653

[29]Li X Z and Liu D J 2005 Chin. Phys. Lett. 22 7