Damghan University Press Journal of Holography Applications in Physics 2783-4778 7 1 2026 07 01 The Big Bang Firewall and the Emergence of Spacetime 142 161 2124 10.22128/jhap.2026.3270.1198 EN Faical Barzi LPTHE, Physics Department, Faculty of Sciences, Ibnou Zohr University, Agadir, Morocco; CRMEF, Regional Center for Education and Training Professions, Marrakesh, Morocco Hasan El Moumni LPTHE, Physics Department, Faculty of Sciences, Ibnou Zohr University, Agadir, Morocco 0000-0001-7408-0910 Karima Masmar LPTHE, Physics Department, Faculty of Sciences, Ibnou Zohr University, Agadir, Morocco Journal Article 2026 02 18 We propose that the Big Bang can be understood as a cosmic-scale entanglement transition occurring in a pre-geometric quantum state. Motivated by the black hole information paradox and the AMPS argument, we interpret the pre-Bang phase as an over-constrained entanglement structure producing a monogamy tension, rather than a fundamental violation of quantum mechanics. The resulting cosmic firewall is not a localized destructive barrier, but a global reorganization of quantum correlations that preserves fine-grained unitarity while allowing the emergence of semiclassical spacetime. We model the pre-Bang substrate as a quantum graph whose highly connected phase encodes dense pre-geometric correlations. Within a semiclassical approximation, the replica trick applied to the gravitational path integral leads to an entanglement--cosmology scaling relation linking variations of entanglement entropy to variations of the effective cosmological constant through the normalized spacetime volume of the emergent background. This scaling is consistent with the known dependence of de Sitter entropy on the cosmological constant. The framework provides a unitary information-theoretic mechanism for spacetime emergence, connects the thermodynamic arrow of time to post-transition entanglement growth, and extends the firewall paradigm from black hole horizons to cosmological initial conditions. It also suggests possible observational windows in primordial non-Gaussianities, stochastic gravitational-wave backgrounds, and ultra-slow variations of effective couplings. https://jhap.du.ac.ir/article_2124_019b68e92c3e5dac9bce571c332b7a02.pdf