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EnglishWithin a broad class of inflationary models we critically analyse the way initial quantum fluctuations on a new-physics hypersurface (NPH) affect standard predictions for large-scale cosmological perturbations. We find that these so-called trans-Planckian effects crucially depend on the definition of the 'vacuum state', in particular on which Hamiltonian is minimized on the NPH in order to select such a state. Trans-Planckian effects can be made much smaller than previously suggested if sufficiently 'adiabatic' Hamiltonians are minimized.
http://hdl.handle.net/11386/1066248| Titolo: | Cosmological Perturbations from a New-Physics Hypersurface |
| Autori interni: | BOZZA, Valerio |
| Data di pubblicazione: | 2003 |
| Rivista: | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS |
| Abstract: | Within a broad class of inflationary models we critically analyse the way initial quantum fluctuations on a new-physics hypersurface (NPH) affect standard predictions for large-scale cosmological perturbations. We find that these so-called trans-Planckian effects crucially depend on the definition of the 'vacuum state', in particular on which Hamiltonian is minimized on the NPH in order to select such a state. Trans-Planckian effects can be made much smaller than previously suggested if sufficiently 'adiabatic' Hamiltonians are minimized. |
| Handle: | http://hdl.handle.net/11386/1066248 |
| Appare nelle tipologie: | 1.1.2 Articolo su rivista con ISSN |
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