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The phase-integral approximation devised by Fr\"oman and Fr\"oman, is used for computing cosmological perturbations in the quartic chaotic inflationary model.
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E. D. Stewart and J. Gong, The density perturbation power spectrum to second-order corrections in the slow-roll expansion
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S. Habib, A. Heinen, K. Heitmann, G. Jungman, and C. Molina-París, Caracterizing inflationary perturbations: The uniform approximation
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R. Casadio, F. Finelli, A. Kamenshchik, M. Luzzi, and G. Venturi, The method of comparison equations for cosmological perturbations
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C. Rojas and V. M. Villalba, Computation of inflationary cosmological perturbations in the power-law inflatioary model using the phase-integral method
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2004
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J. O. Gong, General slow-roll spectrum for gravitational waves
2004
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R. Casadio, F. Finelli, M. Luzzi, and G. Venturi, Improved wkb analysis of cosmological perturbations
2005
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R. Casadio, F. Finelli, M. Luzzi, and G. Venturi, Higher order slow-roll predictions for inflation
2005
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R. Casadio, F. Finelli, M. Luzzi, and G. Venturi, Improved wkb analysis of slow-roll inflation
2005
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S. Habib, A. Heinen, K. Heitmann, and G. Jungman, Inflationary perturbations and precision cosmology
2005
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E. Komatsu, J. Dunkley, M. R. Nolta, C. L. Bennet, B. Gold, G. Hinshaw, N. Jarosik, D. Larson, M. Limon, L. Page, D. N. Spergel, M. Halpern, R. S. Hill, A. Kogut, S. S. Meyer, G. S. Tucker, J. L. Weiland, E. Wollack, and E. L. Wright, Five-year wilkinson microwave anisotropy probe observations: cosmological interpretation
2009
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E. Ramirez and D. J. Schwarz, ϕ 4 \phi^{4} inflation is not excluded
2009
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L. Alabidi and I. Huston, An update on single field models of inflation in light of wmap7
2010
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E. Komatsu, K. M. Smith, J. Dunkley, C. L. Bennet, B. Gold, G. Hinshaw, N. Jarosik, D. Larson, M. R. Nolta, L. Page, D. N. Spergel, M. Halpern, R. S. Hill, A. Kogut, M. Limon, S. S. Meyer, N. Odegard, G. S. Tucker, J. L. Weiland, E. Wollack, and E. L. Wright, Seven-year wilkinson microwave anisotropy probe (wmap? ) observations: Cosmological interpretation
2011
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D. Larson, J. Dunkley, G. Hinshaw, E. Komatsu, M. R. Nolta, C. L. Bennett, B. Gold, M. Halpern, R. S. Hill, N. Jarosik, A. Kogut, M. Limon, S. S. Meyer, N. Odegard, L. Page, K. M. Smith, D. N. Spergel, G. S. Tucker, J. L. Weiland, E. Wollack, and E. L. Wright, Seven-year wilkinson microwave anisotropy probe (wmap) observations. power spectra and wmap-derived parameters
2011
Closest in time.