Cosmological constant vis-à-vis dynamical vacuum: Bold challenging the ΛCDM
Next year we will celebrate 100 years of the cosmological term, Λ, in Einstein's gravitational field equations, also 50 years since the cosmological constant problem was first formulated by Zeldovich, and almost about two decades of the observational evidence that a nonvanishing, positive, Λ-te...
| Autor: | |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2016 |
| País: | España |
| Institución: | Universidad de Barcelona |
| Repositorio: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/142204 |
| Acceso en línea: | https://hdl.handle.net/2445/142204 |
| Access Level: | acceso abierto |
| Palabra clave: | Cosmologia Constants físiques Cosmology Physical constants |
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Cosmological constant vis-à-vis dynamical vacuum: Bold challenging the ΛCDMSolà Peracaula, JoanCosmologiaConstants físiquesCosmologyPhysical constantsNext year we will celebrate 100 years of the cosmological term, Λ, in Einstein's gravitational field equations, also 50 years since the cosmological constant problem was first formulated by Zeldovich, and almost about two decades of the observational evidence that a nonvanishing, positive, Λ-term could be the simplest phenomenological explanation for the observed acceleration of the Universe. This mixed state of affairs already shows that we do not currently understand the theoretical nature of Λ. In particular, we are still facing the crucial question whether Λ is truly a fundamental constant or a mildly evolving dynamical variable. At this point the matter should be settled once more empirically and, amazingly enough, the wealth of observational data at our disposal can presently shed true light on it. In this short review, I summarize the situation of some of these studies. It turns out that the Λ = const. hypothesis, despite being the simplest, may well not be the most favored one when we put it in hard-fought competition with specific dynamical models of the vacuum energy. Recently, it has been shown that the overall fit to the cosmological observables SNIa+BAO+H(z)+LSS+BBN+CMB do favor the class of 'running' vacuum models (RVM's)¿ in which Λ = Λ(H) is a function of the Hubble rate ¿ against the 'concordance' ΛCDM model. The support is at an unprecedented level of ∼4σ and is backed up with Akaike and Bayesian criteria leading to compelling evidence in favor of the RVM option and other related dynamical vacuum models. I also address the implications of this framework on the possible time evolution of the fundamental constants of NatureWorld Scientific Publishing2016info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://hdl.handle.net/2445/142204Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésVersió postprint del document publicat a: https://doi.org/10.1142/S0217751X16300350International Journal of Modern Physics A, 2016, vol. 31, num. 23, p. 1630035https://doi.org/10.1142/S0217751X16300350(c) World Scientific Publishing, 2016info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1422042026-05-27T06:46:51Z |
| dc.title.none.fl_str_mv |
Cosmological constant vis-à-vis dynamical vacuum: Bold challenging the ΛCDM |
| title |
Cosmological constant vis-à-vis dynamical vacuum: Bold challenging the ΛCDM |
| spellingShingle |
Cosmological constant vis-à-vis dynamical vacuum: Bold challenging the ΛCDM Solà Peracaula, Joan Cosmologia Constants físiques Cosmology Physical constants |
| title_short |
Cosmological constant vis-à-vis dynamical vacuum: Bold challenging the ΛCDM |
| title_full |
Cosmological constant vis-à-vis dynamical vacuum: Bold challenging the ΛCDM |
| title_fullStr |
Cosmological constant vis-à-vis dynamical vacuum: Bold challenging the ΛCDM |
| title_full_unstemmed |
Cosmological constant vis-à-vis dynamical vacuum: Bold challenging the ΛCDM |
| title_sort |
Cosmological constant vis-à-vis dynamical vacuum: Bold challenging the ΛCDM |
| dc.creator.none.fl_str_mv |
Solà Peracaula, Joan |
| author |
Solà Peracaula, Joan |
| author_facet |
Solà Peracaula, Joan |
| author_role |
author |
| dc.subject.none.fl_str_mv |
Cosmologia Constants físiques Cosmology Physical constants |
| topic |
Cosmologia Constants físiques Cosmology Physical constants |
| description |
Next year we will celebrate 100 years of the cosmological term, Λ, in Einstein's gravitational field equations, also 50 years since the cosmological constant problem was first formulated by Zeldovich, and almost about two decades of the observational evidence that a nonvanishing, positive, Λ-term could be the simplest phenomenological explanation for the observed acceleration of the Universe. This mixed state of affairs already shows that we do not currently understand the theoretical nature of Λ. In particular, we are still facing the crucial question whether Λ is truly a fundamental constant or a mildly evolving dynamical variable. At this point the matter should be settled once more empirically and, amazingly enough, the wealth of observational data at our disposal can presently shed true light on it. In this short review, I summarize the situation of some of these studies. It turns out that the Λ = const. hypothesis, despite being the simplest, may well not be the most favored one when we put it in hard-fought competition with specific dynamical models of the vacuum energy. Recently, it has been shown that the overall fit to the cosmological observables SNIa+BAO+H(z)+LSS+BBN+CMB do favor the class of 'running' vacuum models (RVM's)¿ in which Λ = Λ(H) is a function of the Hubble rate ¿ against the 'concordance' ΛCDM model. The support is at an unprecedented level of ∼4σ and is backed up with Akaike and Bayesian criteria leading to compelling evidence in favor of the RVM option and other related dynamical vacuum models. I also address the implications of this framework on the possible time evolution of the fundamental constants of Nature |
| publishDate |
2016 |
| dc.date.none.fl_str_mv |
2016 |
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info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion |
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article |
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acceptedVersion |
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https://hdl.handle.net/2445/142204 |
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https://hdl.handle.net/2445/142204 |
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Inglés |
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Inglés |
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Versió postprint del document publicat a: https://doi.org/10.1142/S0217751X16300350 International Journal of Modern Physics A, 2016, vol. 31, num. 23, p. 1630035 https://doi.org/10.1142/S0217751X16300350 |
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(c) World Scientific Publishing, 2016 info:eu-repo/semantics/openAccess |
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(c) World Scientific Publishing, 2016 |
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openAccess |
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application/pdf |
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World Scientific Publishing |
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World Scientific Publishing |
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Articles publicats en revistes (Física Quàntica i Astrofísica) reponame:Dipòsit Digital de la UB instname:Universidad de Barcelona |
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Universidad de Barcelona |
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Dipòsit Digital de la UB |
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Dipòsit Digital de la UB |
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