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| Format: | Artículo científico |
| Sprache: | en |
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Sociedade Brasileira de Física
2005
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| Online-Zugang: | https://www.redalyc.org/articulo.oa?id=46435748 |
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Inhaltsangabe:
- GravitationalWaves: A 100-Year Tool Applied to the Dark Energy Problem E. M. de Gouveia Dal Pino M. Soares-Santos S. V. B. Goncalves J. C. Fabris Física, Astronomía y Matemáticas Recent observations from type Ia Supernovae and from cosmic microwave background (CMB) anisotropieshave revealed that most of the matter of the Universe interacts in a repulsive manner, composing the so-calleddark energy constituent of the Universe. Determining the properties of dark energy is one of the most importanttasks of modern cosmology and this is the main motivation for this work. The analysis of cosmic gravitationalwaves (GW) represents, besides the CMB temperature and polarization anisotropies, an additional approachin the determination of parameters that may constrain the dark energy models and their consistence. In recentwork, a generalized Chaplygin gas model was considered in a flat universe and the corresponding spectrum ofgravitational waves was obtained. In the present work we have added a massless gas component to that modeland the new spectrum has been compared to the previous one. The Chaplygin gas is also used to simulate aL-CDM model by means of a particular combination of parameters so that the Chaplygin gas and the L-CDMmodels can be easily distinguished in the theoretical scenarios here established. We find that the models arestrongly degenerated in the range of frequencies studied. This degeneracy is in part expected since the modelsmust converge to each other when some particular combinations of parameters are considered. 2005 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46435748 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.4B Vol.35