T. Davis, P. Davies, and C. Lineweaver. (2003)cite arxiv:astro-ph/0305121Comment: 14 pages, including 6 figures, to appear in Classical and Quantum Gravity, reference added.
N. Barnaby, T. Biswas, and J. Cline. (2006)cite arxiv:hep-th/0612230
Comment: 34 pages, 4 figures; altered normalization of inflaton fluctuations
which changes the parameter values for which the model is compatible with CMB
observations, one figure removed, added references and clarifying comments.
N. Barnaby, and J. Cline. (2008)cite arxiv:0802.3218
Comment: 26 pages, 5 figures; references added, sign convention for f_NL
clarified, minor corrections.