This boundary-layer paradigm modifies traditional cosmological assumptions in the following ways:
Bulk spacetime geometry is emergent, not fundamental.
Cosmic dynamics may be governed by inter-layer information flow, manifesting as effective field interactions and curvature variations.
Topological phases and entanglement structures at the boundaries determine observable features such as anisotropies, Hubble gradients, or even preferred directions in the cosmic microwave background (CMB).
2. Cosmological Implications of the Holographic Paradigm
Applying holographic logic to cosmology entails reconceptualizing regions of space not as local evolutions from common initial data but as projections from dynamically coupled boundary manifolds. These boundaries may be physical (such as causal horizons) or topological (emergent phase transitions or geometric defects). In the context of a multilayered Universe, each layer's boundary can act as a holographic screen encoding the physics of its adjacent interior layer.
Such a setup:
Naturally accommodates anisotropic expansion histories, as the encoding layer may vary with spatial location;
Provides a mechanism for dark energy suppression, since vacuum energy becomes an emergent property of entanglement entropy rather than a fundamental input;
Generates nonlocal correlations, consistent with observed low-\ell CMB anomalies and cosmic hemispherical asymmetry.
3. AdS/CFT as Inspiration, Not Template
