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Alho, A. & Uggla, C. (2015). Global dynamics and inflationary center manifold and slow-roll approximants. Journal of Mathematical Physics. 56 (1)

A. C. Alho and C. Uggla,  "Global dynamics and inflationary center manifold and slow-roll approximants", in Journal of Mathematical Physics, vol. 56, no. 1, 2015

@article{alho2015_1775212328467,
	author = "Alho, A. and Uggla, C.",
	title = "Global dynamics and inflationary center manifold and slow-roll approximants",
	journal = "Journal of Mathematical Physics",
	year = "2015",
	volume = "56",
	number = "1",
	doi = "10.1063/1.4906081",
	url = "http://aip.scitation.org/doi/10.1063/1.4906081"
}

TY  - JOUR
TI  - Global dynamics and inflationary center manifold and slow-roll approximants
T2  - Journal of Mathematical Physics
VL  - 56
IS  - 1
AU  - Alho, A.
AU  - Uggla, C.
PY  - 2015
SN  - 0022-2488
DO  - 10.1063/1.4906081
UR  - http://aip.scitation.org/doi/10.1063/1.4906081
AB  - We consider the familiar problem of a minimally coupled scalar field with quadratic potential in flat Friedmann-Lemaitre-Robertson-Walker cosmology to illustrate a number of techniques and tools, which can be applied to a wide range of scalar field potentials and problems in, e.g., modified gravity. We present a global and regular dynamical systems description that yields a global understanding of the solution space, including asymptotic features. We introduce dynamical systems techniques such as center manifold expansions and use Pade approximants to obtain improved approximations for the "attractor solution" at early times. We also show that future asymptotic behavior is associated with a limit cycle, which shows that manifest self-similarity is asymptotically broken toward the future and gives approximate expressions for this behavior. We then combine these results to obtain global approximations for the attractor solution, which, e.g., might be used in the context of global measures. In addition, we elucidate the connection between slow-roll based approximations and the attractor solution, and compare these approximations with the center manifold based approximants.
ER  -