Constraining quantum collapse inflationary models with current data: The semiclassical approach
The hypothesis of the self-induced collapse of the inflaton wave function was introduced as a candidate for the physical process responsible for the emergence of inhomogeneity and anisotropy at all scales. In particular, we consider different proposal for the precise form of the dynamics of the infl...
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2019
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02182718_v28_n2_p_Piccirilli http://hdl.handle.net/20.500.12110/paper_02182718_v28_n2_p_Piccirilli |
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paper:paper_02182718_v28_n2_p_Piccirilli2023-06-08T15:21:31Z Constraining quantum collapse inflationary models with current data: The semiclassical approach Cosmological parameters from CMB inflation physics of the early universe The hypothesis of the self-induced collapse of the inflaton wave function was introduced as a candidate for the physical process responsible for the emergence of inhomogeneity and anisotropy at all scales. In particular, we consider different proposal for the precise form of the dynamics of the inflaton wave function: (i) the GRW-type collapse schemes proposals based on spontaneous individual collapses which generate nonvanishing expectation values of various physical quantities taken as ansatz modifications of the standard inflationary scenario; (ii) the proposal based on a Continuous Spontaneous Localization (CSL) type modification of the Schrödinger evolution of the inflaton wave function, based on a natural choice of collapse operator. We perform a systematic analysis within the semi-classical gravity approximation, of the standing of those models considering a full quasi-de Sitter expansion scenario. We note that the predictions for the Cosmic Microwave Background (CMB) temperature and polarization spectrum differ slightly from those of the standard cosmological model. We also analyze these proposals with a Bayesian model comparison using recent CMB and Baryonic Acoustic Oscillations (BAO) data. Our results show a moderate preference of the joint CMB and BAO data for one of the studied collapse schemes model over the ACDM one, while there is no preference when only CMB data are considered. Additionally, analysis using CMB data provide the same Bayesian evidence for both the CSL and Standard Models, i.e. the data have no preference between the simplicity of the LCDM model and the complexity of the collapse scenario. © 2019 World Scientific Publishing Company. 2019 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02182718_v28_n2_p_Piccirilli http://hdl.handle.net/20.500.12110/paper_02182718_v28_n2_p_Piccirilli |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Cosmological parameters from CMB inflation physics of the early universe |
| spellingShingle |
Cosmological parameters from CMB inflation physics of the early universe Constraining quantum collapse inflationary models with current data: The semiclassical approach |
| topic_facet |
Cosmological parameters from CMB inflation physics of the early universe |
| description |
The hypothesis of the self-induced collapse of the inflaton wave function was introduced as a candidate for the physical process responsible for the emergence of inhomogeneity and anisotropy at all scales. In particular, we consider different proposal for the precise form of the dynamics of the inflaton wave function: (i) the GRW-type collapse schemes proposals based on spontaneous individual collapses which generate nonvanishing expectation values of various physical quantities taken as ansatz modifications of the standard inflationary scenario; (ii) the proposal based on a Continuous Spontaneous Localization (CSL) type modification of the Schrödinger evolution of the inflaton wave function, based on a natural choice of collapse operator. We perform a systematic analysis within the semi-classical gravity approximation, of the standing of those models considering a full quasi-de Sitter expansion scenario. We note that the predictions for the Cosmic Microwave Background (CMB) temperature and polarization spectrum differ slightly from those of the standard cosmological model. We also analyze these proposals with a Bayesian model comparison using recent CMB and Baryonic Acoustic Oscillations (BAO) data. Our results show a moderate preference of the joint CMB and BAO data for one of the studied collapse schemes model over the ACDM one, while there is no preference when only CMB data are considered. Additionally, analysis using CMB data provide the same Bayesian evidence for both the CSL and Standard Models, i.e. the data have no preference between the simplicity of the LCDM model and the complexity of the collapse scenario. © 2019 World Scientific Publishing Company. |
| title |
Constraining quantum collapse inflationary models with current data: The semiclassical approach |
| title_short |
Constraining quantum collapse inflationary models with current data: The semiclassical approach |
| title_full |
Constraining quantum collapse inflationary models with current data: The semiclassical approach |
| title_fullStr |
Constraining quantum collapse inflationary models with current data: The semiclassical approach |
| title_full_unstemmed |
Constraining quantum collapse inflationary models with current data: The semiclassical approach |
| title_sort |
constraining quantum collapse inflationary models with current data: the semiclassical approach |
| publishDate |
2019 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02182718_v28_n2_p_Piccirilli http://hdl.handle.net/20.500.12110/paper_02182718_v28_n2_p_Piccirilli |
| _version_ |
1768542311985184768 |