High-Energy Interactions and Radiation Balance in the Intergalactic Medium

Abstract: This theoretical note extends the Universal Cosmic Homeostasis paradigm developed in previous contributions (DOI: 10.5281/zenodo.23218095; DOI: 10.5281/zenodo.23670425) by analyzing the macroscopic quantum interactions that manifest when the high-energy radiant energy spectrum and particle fluxes intercept the nascent baryonic hadron cloud during its post-transition hyperbolic expansion phase. It is suggested that the background electromagnetic and gluonic field, generated by the activation of Quantum Degeneracy Pressure at the Planck scale, does not interact exclusively with photons in the optical and infrared spectrum (the Gray Dust mechanism), but operates as a ubiquitous energetic converter for the extreme radiation spectrum. Specifically, a qualitative and conceptual interpretation is provided for the pure absorption processes of gamma and X-ray photons emitted by remote cosmic sources and extragalactic supernovae, proposing a physical explanation for the exponential attenuation of high-energy radiation over cosmological distances (background optical depth). Furthermore, the in situ production of charged pions and the contextual cross-section enhancement in coherent neutrino-nucleus scattering during the peak temporal compaction phase of nascent quarks are analyzed, suggesting a combined, localized source for the high-energy cosmic neutrino spectrum and for proton fluxes beyond the energy cutoff limit. Finally, a unified reading is proposed for the genesis of intergalactic fast radio bursts, the positron excess detected in cosmic rays, and the dispersion of residual ultra-cold axions, demonstrating the preservation of net charge neutrality and global entropic homeostasis in full compliance with the symmetry constraints and conservation laws of the Standard Model.