Status: Bibliographieeintrag
Standort: ---
Exemplare:
---
| Online-Ressource |
Verfasst von: | Amendola, Luca [VerfasserIn]  |
Titel: | Coupled quintessence |
Verf.angabe: | Luca Amendola, Osservatorio Astronomico di Roma, Viale Parco Mellini 84, 00136 Roma, Italy |
Fussnoten: | Gesehen am 17.11.2017 |
Titel Quelle: | Enthalten in: De.arxiv.org |
Jahr Quelle: | 1999 |
Band/Heft Quelle: | (1999) Artikel-Nummer 9908023, 18 Seiten |
Abstract: | A new component of the cosmic medium, a light scalar field or ''quintessence '', has been proposed recently to explain cosmic acceleration with a dynamical cosmological constant. Such a field is expected to be coupled explicitely to ordinary matter, unless some unknown symmetry prevents it. I investigate the cosmological consequences of such a coupled quintessence (CQ) model, assuming an exponential potential and a linear coupling. This model is conformally equivalent to Brans-Dicke Lagrangians with power-law potential. I evaluate the density perturbations on the cosmic microwave background and on the galaxy distribution at the present and derive bounds on the coupling constant from the comparison with observational data. A novel feature of CQ is that during the matter dominated era the scalar field has a finite and almost constant energy density. This epoch, denoted as $\phi $MDE, is responsible of several differences with respect to uncoupled quintessence: the multipole spectrum of the microwave background is tilted at large angles, the acoustic peaks are shifted, their amplitude is changed, and the present 8Mpc$/h$ density variance is diminished. The present data constrain the dimensionless coupling constant to $|\beta |\leq 0.1$. |
URL: | Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.
Kostenfrei: Verlag: http://arxiv.org/abs/astro-ph/9908023 |
Datenträger: | Online-Ressource |
Sprache: | eng |
K10plus-PPN: | 1565459792 |
Verknüpfungen: | → Sammelwerk |
Coupled quintessence / Amendola, Luca [VerfasserIn] (Online-Ressource)
68191815