ΛCDM evolves a hot, dense, expanding state forward in time with great success, but it cannot say what produced that state. Traced backward the model hits a singularity where general relativity fails, the Borde-Guth-Vilenkin theorem shows inflating spacetimes are past-incomplete, and the required low-entropy starting point carries Penrose's fine-tuning of one part in 10^(10^123). What banged, and what came before, sit outside the model.
The assumption is that the hot dense state was the beginning of everything: a universe-wide singular origin at which time itself starts. Once that is locked in, no prior cause can exist even in principle, every initial condition becomes an unexplained input at the boundary, and the model has nowhere to put the answer.
SCT replaces the hot-dense-center with a superluminal collision between two pre-existing spacetime pockets and the thermalized debris field that became our visible universe. From this single change the origin question becomes ordinary causal physics: the Big Bang is t = 0 of our local thermal history, not t = 0 of existence (P1). When two pockets formed in causally disconnected regions intersect at relative velocity above c, the intersection front engulfs the overlap volume before any internal signal can respond, depositing the bulk kinetic energy of both pockets essentially simultaneously (P22). The governing physics is the junction-condition formalism of general relativity; no energy condition is violated.
Nothing was created from nothing. The matter in our universe existed before the collision as the content of the two parent pockets, carrying compositions, density profiles, angular momenta, and magnetic field configurations inherited from prior collision generations (P25). Only the overlap volume was thermalized; beyond our horizon at 46.5 gigalight-years SCT predicts not empty space but the continuation of parent pocket structure (P26). The low-entropy puzzle dissolves with the same move: a collision is a localized, ordered injection of bulk kinetic energy into one small region of an eternal manifold, not a random draw from a global phase space, so no 10^(10^123) miracle is required.
In an infinite, eternal universe with nonzero mass-energy density and a nonzero collision rate, big bang events are a mathematical necessity, and there are infinitely many of them (P27); ours is distinguished only by being the one whose products we inhabit. This is the same single change that resolves the horizon and flatness problems without inflation and supplies the collision geometry that seeds structure, inherited angular momentum, and the CMB anomaly axes. There is no need to invoke an inflaton field, a quantum-gravity creation event, or a beginning of time.
A confirmed detection of primordial B-mode polarization with r > 0.01 at 3σ or better (CMB-S4, LiteBIRD, Simons Observatory) would establish the inflationary gravitational-wave background and falsify the no-inflation collision origin, since the collision cascade requires r < 10⁻⁵. Independently, if the gigaparsec-scale structures the first collision stage predicts (the Big Ring and Giant Arc) are shown by DESI and Euclid to be projection or selection artifacts, the collision-geometry signature of the origin is removed.