Galaxy clusters, type Ia supernovae and the fine structure constant
| Autor: | Susana J. Landau, L. R. Colaço, R. F. L. Holanda, V. C. Busti, Jailson S. Alcaniz |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO) 010308 nuclear & particles physics Ciencias Físicas Angular diameter distance FOS: Physical sciences Astronomy and Astrophysics Fine-structure constant Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Redshift Astronomía Supernova 0103 physical sciences Cluster (physics) SUPERNOVAS Dilaton Surface brightness GALAXY CLUSTERS 010303 astronomy & astrophysics MODIFIED GRAVITY CIENCIAS NATURALES Y EXACTAS Galaxy cluster Astrophysics - Cosmology and Nongalactic Astrophysics |
| DOI: | 10.48550/arxiv.1605.02578 |
| Popis: | As is well known, measurements of the Sunyaev-Zeldovich effect can be combined with observations of the X-ray surface brightness of galaxy clusters to estimate the angular diameter distance to these structures. In this paper, we show that this technique depends on the fine structure constant, $\alpha$. Therefore, if $\alpha$ is a time-dependent quantity, e.g., $\alpha=\alpha_0 \phi(z)$, where $\phi$ is a function of redshift, we argue that current data do not provide the real angular diameter distance, $D_{\rm{A}}(z)$, to the cluster but instead $D_A^{data}(z) = \phi(z)^2 D_{\rm{A}}(z)$. We use this result to derive constraints on a possible variation of $\alpha$ for a class of dilaton runaway models considering a sample of 25 measurements of $D_A^{data}(z)$ in redshift range $0.023 < z < 0.784$ and estimates of $D_{\rm{A}}(z)$ from current type Ia supernovae observations. We find no significant indication of variation of $\alpha$ with the present data. Comment: 8 pages, 4 figures, To appear in JCAP |
| Databáze: | OpenAIRE |
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