Initial conditions and sampling for multifield inflation
We investigate the initial conditions problem for multifield inflation. In these scenarios the pre-inflationary dynamics can be chaotic, increasing the sensitivity of the onset of inflation to the initial data even in the homogeneous limit. To analyze physically equivalent scenarios we compare initi...
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| Veröffentlicht in: | Journal of cosmology and astroparticle physics 2013-07, Vol.2013 (7), p.i-17 |
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| container_issue | 7 |
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| container_title | Journal of cosmology and astroparticle physics |
| container_volume | 2013 |
| creator | Easther, Richard Price, Layne C |
| description | We investigate the initial conditions problem for multifield inflation. In these scenarios the pre-inflationary dynamics can be chaotic, increasing the sensitivity of the onset of inflation to the initial data even in the homogeneous limit. To analyze physically equivalent scenarios we compare initial conditions at fixed energy. This ensures that each trajectory is counted once and only once, since the energy density decreases monotonically. We present a full analysis of hybrid inflation that reveals a greater degree of long range order in the set of "successful" initial conditions than was previously apparent. In addition, we explore the effective smoothing scale for the fractal set of successful initial conditions induced by the finite duration of the pre-inflationary phase. The role of the prior information used to specify the initial data is discussed in terms of Bayesian sampling. |
| doi_str_mv | 10.1088/1475-7516/2013/07/027 |
| format | Article |
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| ispartof | Journal of cosmology and astroparticle physics, 2013-07, Vol.2013 (7), p.i-17 |
| issn | 1475-7516 1475-7516 |
| language | eng |
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| source | IOP Publishing Journals; Institute of Physics (IOP) Journals - HEAL-Link |
| subjects | ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Bayesian analysis CHAOS THEORY COMPARATIVE EVALUATIONS COSMOLOGY ENERGY DENSITY Equivalence Fractal analysis FRACTALS Inflation INFLATIONARY UNIVERSE INFLATONS Initial conditions Mathematical analysis Sampling SENSITIVITY Smoothing |
| title | Initial conditions and sampling for multifield inflation |
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