B-Space Cosmology: A Finite-Cosmos Framework with a ΛCDM Limit, Validated by Multi-Survey Dipole Concordance

B-Space Cosmology, is a new theoretical framework proposed by Firas Shrourou, an independent researcher. This framework offers a unified alternative to the prevailing Lambda Cold Dark Matter (ΛCDM)

Description

B-Space Cosmology introduces a paradigm shift in the fundamental architecture of the universe, positing that the observable universe is a FINITE BARYONIC COSMOS (FBC) embedded in an infinite, static Euclidean substrate (B-Space) permeated by a physical DARK MEDIUM SEA (DMS). This framework provides a new and leaner story that addresses foundational puzzles of standard cosmology by reinterpreting phenomena conventionally attributed to dark components:

Core Ontological Departures

1. COSMIC EXPANSION AND ACCELERATION: The framework rejects the premise of an expanding spacetime metric. Instead, late-time cosmic acceleration emerges as a KINEMATIC CONSEQUENCE OF THE FBC’S FINITENESS and its interaction with the DMS (The F_eff Mechanism), which governs the background kinematic evolution (H_B(z)).

2. COSMOLOGICAL REDSHIFT: Cosmological redshift is modeled as a PROPAGATION EFFECT (W-Drag) resulting from achromatic energy loss as waves traverse the DMS, quantified by the Wave-Impedance Coefficient kappa(z). Crucially, the architecture is TWO-CHANNEL BY CONSTRUCTION, separating background kinematics (H_B(z)) from propagation (H_0(z) = c*kappa(z)), while inheriting exact flatness axiomatically (k_B=0). This preserves fundamental propagation invariants like time dilation, Etherington duality, and the Tolman surface brightness relation.

3. STRUCTURE AND DARK MATTER: Large-scale structure is sourced by baryons and GRAVITATING PERTURBATIONS WITHIN THE DMS (rho_DMS_pert), offering an alternative to particle dark matter. The DMS also manifests as the Dark Medium Flow (DMF), which interacts locally with baryons via G-Drag, mediating structure evolution, regulating accretion, and transporting angular momentum.

4. ORIGIN OF THE COSMOS: The horizon problem is addressed without inflation via a CAUSAL, SUBLUMINAL HYDRODYNAMIC EVENT—the primordial Dark Medium Carapace (DMC) shock wave—which forges the FBC with a uniform temperature and sets coherent acoustic initial conditions.

The Central Prediction and Observational Validation

The finite nature of the FBC implies the existence of a geometric center, which reframes the Copernican Principle from an axiom to a testable measurement. Using the CMB dipole speed and the H_B-leg background rate, the observer is inferred to have an off-center offset of d_offset ~ 9.3 Mpc. This small offset (approximately 0.067% of the FBC radius) generates the framework’s core geometric prediction: the existence of CORRELATED ANISOTROPIC SIGNATURES ALIGNED WITH THE CMB KINEMATIC DIPOLE—THE SHROUROU AXIS.

The paper presents compelling multi-tier observational evidence validating this prediction:

• MULTI-EPOCH CONCORDANCE (DOE 1): A directional alignment of approximately ~2.7° is found between the primordial CMB HEMISPHERICAL POWER-ASYMMETRY AXIS and the late-time SPIRAL-GALAXY SPIN-PARITY AXIS. This agreement indicates a shared geometric origin for anisotropies across cosmic time.

• HIGH-REDSHIFT KINEMATIC ANCHOR (DOE 2): A high-redshift number-count dipole (z >= 2) measured using Quaia quasars yields an exceptional 5.4° alignment with the CMB/Solar frame, providing a clean measurement of our bulk motion relative to the cosmic rest frame.

• UNIVERSAL DIPOLE PATTERN: Independent surveys (e.g., NVSS, CatWISE2020) reveal a consistent LARGE-SCALE STRUCTURE DIPOLE PATTERN that aligns directionally with the CMB while exhibiting amplitudes (O(10^-2)) that exceed pure-kinematic expectations, thereby resolving the literature-wide "dipole tension" through the dual-ladder separation.

Relationship to the Standard Model

B-Space Cosmology is a conservative generalization of the standard model. IN THE CENTRAL-OBSERVER LIMIT (v_drift = 0 and H_0(z) = H_B(z)), the framework REDUCES EXACTLY TO FLAT ΛCDM, preserving all its established successes. The convergent, multi-probe evidence presented demonstrates that we are not in this special limit, but instead occupy a measurable position within a finite cosmic domain whose geometric architecture is now testable.

Cite as:
Firas Shrourou (2025), B-Space Cosmology: A Finite-Cosmos Framework with a ΛCDM Limit, Validated by Multi-Survey Dipole Concordance, doi:10.5281/zenodo.17069444