dorsal/arxiv
View SchemaLaboratory spectroscopy and the search for space-time variation of the fine structure constant using QSO spectra
| Authors | J. C. Berengut, V. A. Dzuba, V. V. Flambaum, M. G. Kozlov, M. V. Marchenko, M. T. Murphy, J. K. Webb |
|---|---|
| Categories | |
| ArXiv ID | physics/0408017 |
| URL | https://arxiv.org/abs/physics/0408017 |
Abstract
Theories unifying gravity with other interactions suggest spatial and temporal variation of fundamental ``constants'' in the Universe. A change in the fine structure constant, alpha, could be detected via shifts in the frequencies of atomic transitions in quasar absorption systems. Previous studies of three independent samples of data, containing 143 absorption systems spread from 2 to 10 billion years after big bang, hint that alpha was smaller 7 - 11 billion years ago. To continue this study we urgently need accurate laboratory measurements of atomic transition frequencies. In this paper, we present a current list of transitions of importance to the search for alpha variation. They are E1 transitions to the ground state in several different atoms and ions, with wavelengths ranging from around 900 - 6000 Angstroms, and require an accuracy of better than 10^(-4) Angstroms. We also discuss isotope shift measurements that are needed in order to resolve systematic effects in the study. Researchers who are interested in performing these measurements should contact the authors directly.
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"abstract": "Theories unifying gravity with other interactions suggest spatial and\ntemporal variation of fundamental ``constants\u0027\u0027 in the Universe. A change in\nthe fine structure constant, alpha, could be detected via shifts in the\nfrequencies of atomic transitions in quasar absorption systems. Previous\nstudies of three independent samples of data, containing 143 absorption systems\nspread from 2 to 10 billion years after big bang, hint that alpha was smaller 7\n- 11 billion years ago.\n To continue this study we urgently need accurate laboratory measurements of\natomic transition frequencies. In this paper, we present a current list of\ntransitions of importance to the search for alpha variation. They are E1\ntransitions to the ground state in several different atoms and ions, with\nwavelengths ranging from around 900 - 6000 Angstroms, and require an accuracy\nof better than 10^(-4) Angstroms. We also discuss isotope shift measurements\nthat are needed in order to resolve systematic effects in the study.\n Researchers who are interested in performing these measurements should\ncontact the authors directly.",
"arxiv_id": "physics/0408017",
"authors": [
"J. C. Berengut",
"V. A. Dzuba",
"V. V. Flambaum",
"M. G. Kozlov",
"M. V. Marchenko",
"M. T. Murphy",
"J. K. Webb"
],
"categories": [
"physics.atom-ph"
],
"title": "Laboratory spectroscopy and the search for space-time variation of the fine structure constant using QSO spectra",
"url": "https://arxiv.org/abs/physics/0408017"
},
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