Cosmological consequences of statistical inhomogeneity
Fuente:
arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866913669338628096 |
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| author | Ragavendra, H. V. Mukherjee, Dipayan Sethi, Shiv K. |
| author_facet | Ragavendra, H. V. Mukherjee, Dipayan Sethi, Shiv K. |
| contents | A space-dependent mean for cosmological perturbations negates the ansatz of statistical homogeneity and isotropy, and hence ergodicity. In this work, we construct such a primordial mean of scalar perturbations from an alternative quantum initial state (coherent state) and examine the associated power and bi-spectra. A multitude of cosmological tests based on these spectra are discussed. We find that current cosmological data doesn't favor a primordial mean over large scales and strong constraints arise from the limit on bispectrum from Planck data. At small scales, this hypothesis can be tested by future observables such as $μ$-distortion of CMB. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_01331 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Cosmological consequences of statistical inhomogeneity Ragavendra, H. V. Mukherjee, Dipayan Sethi, Shiv K. Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology A space-dependent mean for cosmological perturbations negates the ansatz of statistical homogeneity and isotropy, and hence ergodicity. In this work, we construct such a primordial mean of scalar perturbations from an alternative quantum initial state (coherent state) and examine the associated power and bi-spectra. A multitude of cosmological tests based on these spectra are discussed. We find that current cosmological data doesn't favor a primordial mean over large scales and strong constraints arise from the limit on bispectrum from Planck data. At small scales, this hypothesis can be tested by future observables such as $μ$-distortion of CMB. |
| title | Cosmological consequences of statistical inhomogeneity |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2411.01331 |