Spatial Curvature and Thermodynamics

Abstract

Reasonable parametrizations of the current Hubble data set of the expansion rate of our homogeneous and isotropic universe, after suitable smoothing of these data, strongly suggests that the area of the apparent horizon increases irrespective of whether the spatial curvature of the metric is open, flat or closed. Put in another way, any sign of the spatial curvature appears consistent with the second law of thermodynamics.

arXiv comment9 pages, 7 sets of figures, Version published in MNRAS

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• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Model-independent cosmological inference post DESI DR1 BAO measurements
• A thorough investigation of the prospects of eLISA in addressing the Hubble tension: Fisher Forecast, MCMC and Machine Learning
• Non-parametric reconstruction of cosmological observables using Gaussian Processes Regression
• Analytical Gaussian Process Cosmography: Unveiling Insights into Matter-Energy Density Parameter at Present
• Checking the second law at cosmic scales
• A possible late-time transition of $M_B$ inferred via neural networks
• A comprehensive data-driven odyssey to explore the equation of state of dark energy
• Thermodynamics of the Primordial Universe
• Exploring thermodynamics inconsistencies in unimodular gravity: a comparative study of two energy diffusion functions