AustralieFrV1, Main, Exploration, bibRecord, 008414

Constraining Fundamental Constants of Physics with Quasar Absorption Line Systems

Identifieur interne : 008414 ( Main/Exploration ); précédent : 008413; suivant : 008415

Constraining Fundamental Constants of Physics with Quasar Absorption Line Systems

Auteurs : Patrick Petitjean [France] ; Raghunathan Srianand [Inde] ; Hum Chand [Inde] ; Alexander Ivanchik [Russie] ; Pasquier Noterdaeme [Inde] ; Neeraj Gupta [Australie]

Source :

Space science reviews [ 0038-6308 ] ; 2009.

RBID : Pascal:10-0118248

Descripteurs français

Pascal (Inist)
- Constante fondamentale, Quasar, Raie absorption, Borne supérieure, Déplacement vers le rouge, Constante structure fine, Proton, Rapport masse, Rapport gyromagnétique, Analyse sensibilité, Rapport signal bruit, Galaxies.

English descriptors

KwdEn :
- Absorption line, Fine structure constant, Fundamental constants, Galaxies, Gyromagnetic ratio, Mass ratio, Protons, Quasars, Red shift, Sensitivity analysis, Signal-to-noise ratio, Upper bound.

Abstract

We summarize the attempts by our group and others to derive constraints on variations of fundamental constants over cosmic time using quasar absorption lines. Most upper limits reside in the range 0.5-1.5 x 10-⁵ at the 3σ level over a redshift range of approximately 0.5-2.5 for the fine-structure constant, α, the proton-to-electron mass ratio, μ and a combination of the proton gyromagnetic factor and the two previous constants, g_p(α²/μ)^v, for only one claimed variation of α. It is therefore very important to perform new measurements to improve the sensitivity of the numerous methods to at least <0.1 × 10-⁵ which should be possible in the next few years. Future instrumentations on ELTs in the optical and/or ALMA, EVLA and SKA pathfinders in the radio will undoutedly boost this field by allowing to reach much better signal-to-noise ratios at higher spectral resolution and to perform measurements on molecules in the ISM of high redshift galaxies.

Affiliations:

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Le document en format XML

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Constraining Fundamental Constants of Physics with Quasar Absorption Line Systems

Constraining Fundamental Constants of Physics with Quasar Absorption Line Systems

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri