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arXiv · 2606.00227

Constraints on the Phenomenology of Dissipative Cosmological Memory from BAO (BOSS + DESI 2024) and Pantheon+ Data

S. M. Ponomarenko
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Abstract

We propose and test a phenomenological model of ``dissipative memory'' in the gravitational field, where early quantum gravitational processes leave a relic signature in the cosmic expansion rate. The model is parameterized by an additional fluid with amplitude $\epsilon$, decay scale $z_*$, and a steepness index $\beta$, decaying according to a Debye law $f(z) = \exp[{-(z/z_*)^\beta}]$. We perform a joint Bayesian analysis using baryon acoustic oscillation data from BOSS DR12 and DESI 2024, photometric distances from Pantheon$+$, and $H_0$ measurements (SHOES and Planck). A global optimization reveals that the best fit is identical to $\Lambda$CDM: the memory correction vanishes across the entire observable range $z \in [0.3,\,2.3]$ ($\Delta\chi^2 < 0.01$ with three extra parameters, $\Delta\mathrm{AIC}=+6.0$, $\Delta\mathrm{BIC}=+9.9$). This establishes an upper bound on the memory amplitude: $\epsilon < 0.05$ for $z_* < 2$ (95% CL). We discuss the physical interpretation of this constraint and point out observational channels where the memory effect could potentially manifest.

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S. M. Ponomarenko. 2026-05-29. Constraints on the Phenomenology of Dissipative Cosmological Memory from BAO (BOSS + DESI 2024) and Pantheon+ Data. https://arxiv.org/abs/2606.00227

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