UniSa - IRIS Institutional Research Information System
IRIS è la soluzione IT che facilita la raccolta e la gestione dei dati relativi alle attività e ai prodotti della ricerca. Fornisce a ricercatori, amministratori e valutatori gli strumenti per monitorare i risultati della ricerca, aumentarne la visibilità e allocare in modo efficace le risorse disponibili.
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.
| Titolo: | Cosmological Perturbations from a New-Physics Hypersurface |
| Autori: | |
| Data di pubblicazione: | 2003 |
| Rivista: | |
| 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 |
File in questo prodotto:
http://hdl.handle.net/11386/1066248
Copyright © 2021