Built on

P. Brax and E. Cluzel, Perturbation Theory in k-Inflation Coupled to Matter
Original
1917
Earlier work this paper cites.
Dover, New York, ninth dover printing, tenth gpo printing ed., 1965
M. Abramowitz and I. A. Stegun, Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables · 1965
Earlier work this paper cites.
C. Armendariz-Picon, T. Damour, and V. F. Mukhanov, k-Inflation
1999
Earlier work this paper cites.
J. Garriga and V. F. Mukhanov, Perturbations in k-inflation
1999
Earlier work this paper cites.
E. Silverstein and D. Tong, Scalar Speed Limits and Cosmology: Acceleration from D- cceleration
2004
Earlier work this paper cites.
M. Alishahiha, E. Silverstein, and D. Tong, DBI in the sky
2004
Earlier work this paper cites.
C. Burgess, R. Easther, A. Mazumdar, D. F. Mota, and T. Multamaki, Multiple inflation, cosmic string networks and the string landscape
2005
Earlier work this paper cites.
S. Kecskemeti, J. Maiden, G. Shiu, and B. Underwood, DBI inflation in the tip region of a warped throat
2006
Earlier work this paper cites.
Cambridge University Press, 2006
A. R. Liddle and D. H. Lyth, Cosmological Inflation and Large-Scale Structure · 2006
Earlier work this paper cites.
R. Bean, S. E. Shandera, S. H. Henry Tye, and J. Xu, Comparing Brane Inflation to WMAP
2007
Earlier work this paper cites.
H. V. Peiris, D. Baumann, B. Friedman, and A. Cooray, Phenomenology of D-Brane Inflation with General Speed of Sound
Original
2007
Earlier work this paper cites.

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Then

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2009
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Original
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P. Brax, C. van de Bruck, L. M. Hall, and J. M. Weller, Slow-Roll Inflation in the Presence of a Dark Energy Coupling
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2011

Inflationary predictions in scalar-tensor DBI inflation

Weller, Joel M., van de Bruck, Carsten, Mota, David F.

Understand

The scalar-tensor Dirac-Born-Infeld (DBI) inflation scenario provides a simple mechanism to reduce the large values of the boost factor associated with single field models with DBI action, whilst still being able to drive 60 efolds of inflation.

Using a slow-roll approach, we obtain an analytical expression for the spectral index of the perturbations and, moreover, determine numerically the regions of the parameter space of the model capable of giving rise to a power spectrum with amplitude and spectral index within the observed bounds.
We find that regions that exhibit significant DBI effects throughout the inflationary period can be discarded by virtue of a blue-tilted spectral index, however, there are a number of viable cases --- associated with a more red-tilted spectral index --- for which the boost factor is initially suppressed by the effect of the coupling between the fields, but increases later to moderate values.

Built on

P. Brax and E. Cluzel, Perturbation Theory in k-Inflation Coupled to Matter
Original
1917
Earlier work this paper cites.
Dover, New York, ninth dover printing, tenth gpo printing ed., 1965
M. Abramowitz and I. A. Stegun, Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables · 1965
Earlier work this paper cites.
C. Armendariz-Picon, T. Damour, and V. F. Mukhanov, k-Inflation
1999
Earlier work this paper cites.
J. Garriga and V. F. Mukhanov, Perturbations in k-inflation
1999
Earlier work this paper cites.
E. Silverstein and D. Tong, Scalar Speed Limits and Cosmology: Acceleration from D- cceleration
2004
Earlier work this paper cites.
M. Alishahiha, E. Silverstein, and D. Tong, DBI in the sky
2004
Earlier work this paper cites.
C. Burgess, R. Easther, A. Mazumdar, D. F. Mota, and T. Multamaki, Multiple inflation, cosmic string networks and the string landscape
2005
Earlier work this paper cites.
S. Kecskemeti, J. Maiden, G. Shiu, and B. Underwood, DBI inflation in the tip region of a warped throat
2006
Earlier work this paper cites.
Cambridge University Press, 2006
A. R. Liddle and D. H. Lyth, Cosmological Inflation and Large-Scale Structure · 2006
Earlier work this paper cites.
R. Bean, S. E. Shandera, S. H. Henry Tye, and J. Xu, Comparing Brane Inflation to WMAP
2007
Earlier work this paper cites.
H. V. Peiris, D. Baumann, B. Friedman, and A. Cooray, Phenomenology of D-Brane Inflation with General Speed of Sound
Original
2007
Earlier work this paper cites.