On the Hubble expansion in a Big Bang quantum cosmology
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866916519087177728 |
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| author | van Putten, Maurice H. P. M. |
| author_facet | van Putten, Maurice H. P. M. |
| contents | The Hubble expansion of the Universe is considered in the classical limit of a Big Bang quantum cosmology. In an IR-consistent coupling to the the bare cosmological constant, we infer a dark energy as a relic of the Big Bang by loss of time-translation invariance on a Hubble time-scale. This dark energy is identified with the trace $J$ of the Schouten tensor permitting an analytic solution $H(z)$. Anchored by the {\em Baryonic Accoustic Oscillations}, $J$CDM predicts a Hubble constant $H_0=\sqrt{6/5}\,H_0^Λ$ alleviating $H_0$-tension between the Local Distance Ladder and $H_0^Λ$ in $Λ$CDM, whose dark energy $Λ$ is a constant. Emulated by $w(a)Λ$CDM, a CAMB analysis shows a $J$CDM fit to the {\em Planck} 2018 $C_l^{TT}$ power spectrum on par with $Λ$CDM with small positive curvature consistent with {\em Planck}-$Λ$CDM with no extra relativistic degrees of freedom. In late-time cosmology, $J$CDM is also consistent with the BAO recently measured by DESI. { $J$CDM offers a novel framework to address $H_0$-tension, predicting background quantities consistent with the uncertainties in BAO measurements and early-Universe observations.} It predicts a deceleration parameter $q_0\simeq-1$, that may be tested with upcoming low-redshift galaxy surveys. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_10865 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | On the Hubble expansion in a Big Bang quantum cosmology van Putten, Maurice H. P. M. Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology The Hubble expansion of the Universe is considered in the classical limit of a Big Bang quantum cosmology. In an IR-consistent coupling to the the bare cosmological constant, we infer a dark energy as a relic of the Big Bang by loss of time-translation invariance on a Hubble time-scale. This dark energy is identified with the trace $J$ of the Schouten tensor permitting an analytic solution $H(z)$. Anchored by the {\em Baryonic Accoustic Oscillations}, $J$CDM predicts a Hubble constant $H_0=\sqrt{6/5}\,H_0^Λ$ alleviating $H_0$-tension between the Local Distance Ladder and $H_0^Λ$ in $Λ$CDM, whose dark energy $Λ$ is a constant. Emulated by $w(a)Λ$CDM, a CAMB analysis shows a $J$CDM fit to the {\em Planck} 2018 $C_l^{TT}$ power spectrum on par with $Λ$CDM with small positive curvature consistent with {\em Planck}-$Λ$CDM with no extra relativistic degrees of freedom. In late-time cosmology, $J$CDM is also consistent with the BAO recently measured by DESI. { $J$CDM offers a novel framework to address $H_0$-tension, predicting background quantities consistent with the uncertainties in BAO measurements and early-Universe observations.} It predicts a deceleration parameter $q_0\simeq-1$, that may be tested with upcoming low-redshift galaxy surveys. |
| title | On the Hubble expansion in a Big Bang quantum cosmology |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2403.10865 |