Resolution of the Conceptual and Philosophical Challenge in Ginestra Bianconi’s “Gravity from Entropy” Framework: Insights from Obidi’s Theory of Entropicity (ToE) - Part II
The Bianconi Paradox (BP), Bianconi's Vicarious Induction (BVI), and ToE's Charismatic Hypothesis (TCH)
Preamble
Abstract
Ginestra Bianconi’s information‑theoretic approach to gravity proposes that gravitational dynamics emerge from the quantum relative entropy between two spacetime metrics. While mathematically elegant (and complex), Bianconi's construction raises a conceptual challenge: Why should the entropy difference between a spacetime metric and a matter‑induced metric generate gravitational attraction between bodies? This dualistic comparison appears structurally mismatched (one is natural and the other is induced - epistemic duality). This is ToE's framing of Bianconi's Paradox (BP).
Obidi’s Theory of Entropicity (ToE) resolves this tension by replacing Bianconi’s dual‑metric ontology with a monistic entropic substrate. In ToE, spacetime and matter metrics are not primitive objects but emergent manifestations of the curvature of a single entropic field . Distinguishability is measured not between metrics but between configurations of this entropic field. This shift eliminates the paradox inherent in Bianconi’s construction and provides a unified, pre‑geometric foundation for gravity, matter, and quantum behaviour.
This work presents the conceptual challenge in Bianconi’s model, articulates the monistic resolution offered by ToE, and clarifies the philosophical and mathematical implications of grounding physical reality in entropic curvature rather than metric comparison.
1. Introduction
Information‑theoretic approaches to gravity have gained prominence as physicists seek deeper unifying principles beneath spacetime geometry. Among these, Ginestra Bianconi’s proposal that gravity emerges from the quantum relative entropy between two metrics has attracted attention for its conceptual novelty and mathematical structure and beauty.
Yet this framework introduces a subtle but significant conceptual difficulty: the comparison is made between two different kinds of geometric objects, a background spacetime metric and a matter‑perturbed metric. This dualistic structure raises the question of why the entropy difference between these heterogeneous entities should produce gravitational attraction between bodies.
Obidi’s Theory of Entropicity (ToE) offers a resolution by shifting the ontological foundation from metrics to a single entropic field. In ToE, spacetime and matter metrics are emergent, not fundamental. Distinguishability is measured within the entropic field itself, eliminating the need for dual metrics and resolving the conceptual mismatch.
In this paper we analyze the challenge in Bianconi’s model and present the ToE‑based resolution.
2. The Structure of Bianconi’s “Gravity from Entropy” Framework
Bianconi’s proposal interprets gravity as emerging from the quantum relative entropy between two metrics:
g₀: a reference (background) metric
g: a matter‑perturbed metric
The gravitational interaction is then associated with the relative entropy:
S(g || g₀)
This construction is mathematically well‑defined and draws on the deep relationship between information geometry and quantum field theory. However, it implicitly assumes:
the existence of two distinct metrics
the existence of a Hilbert‑space representation of these metrics
the existence of density operators associated with each metric
This makes the framework dualistic: physical meaning arises only through comparison between two pre‑existing geometric structures.
3. The Conceptual Challenge: A Category Mismatch
The central conceptual difficulty is the following:
Why should the entropy difference between a spacetime metric and a matter‑induced metric generate gravitational attraction between two bodies?
The two metrics are not of the same ontological category:
The spacetime metric describes the geometry of the vacuum.
The matter metric describes the geometry perturbed by matter.
Comparing them is akin to comparing:
the temperature of a room
with the mass of a rock
The comparison is mathematically possible but physically opaque.
The intuitive expectation is that gravitational attraction between two bodies should arise from the difference between their matter configurations, not from the difference between matter and vacuum geometry.
This is the Bianconi Paradox:
Gravity is derived from the relative entropy between two metrics, but the metrics themselves are not explained—they are presupposed.
This reveals a deeper issue: Bianconi’s model explains gravity within geometry but does not explain the origin of [that] geometry itself.
4. Obidi’s Theory of Entropicity (ToE): A Monistic Foundation
ToE begins from a fundamentally different premise. Instead of assuming the existence of two metrics, ToE posits a single entropic field:
S(x)
Everything else—spacetime, matter, curvature, identity—emerges from the curvature of this entropic field.
4.1 Monistic Ontology
ToE is monistic because:
There is one fundamental field.
There is one curvature structure.
There is one variational principle.
There is one invariant (ln 2).
Metrics are not primitive; they are derived from the entropic geometry.
4.2 Distinguishability in ToE
In ToE, distinguishability is measured not between metrics but between entropic configurations:
D(x) = S(x) ln( S(x) / S₀(x) ) − S(x) + S₀(x)
This is the continuum analogue of Kullback–Leibler (or Umegaki) divergence. It is a scalar, defined on the same manifold, and conceptually coherent.
4.3 The Obidi Curvature Invariant (OCI)
The smallest distinguishable curvature fold is:
ln 2
This invariant governs:
emergence of spacetime
emergence of matter
gravitational interaction
quantum transitions
causal structure
Thus, ToE provides a unified, pre‑geometric foundation.
5. Resolution of the Bianconi Paradox
The paradox arises because Bianconi compares:
a spacetime metric
a matter metric
But ToE shows that both metrics are emergent, not fundamental.
Thus, the comparison is ill‑posed via the lens of ToE.
5.1 The Correct Ontological Comparison
In ToE, the meaningful comparison is:
S(x) vs S₀(x)
not:
g vs g₀
This resolves the paradox because:
both S and S₀ are entropic fields
both live on the same manifold (and no need for Bianconi's Vicarious Induction - BVI)
both have the same ontological status
distinguishability is intrinsic, not relational
5.2 Gravity as Entropic Curvature
In ToE:
gravity is not the entropy difference between two metrics
gravity is the curvature of the entropic field
spacetime metrics are shadows of entropic curvature
Thus, ToE explains:
why metrics exist
why curvature exists
why gravity exists
Bianconi explains gravity given metrics. ToE explains metrics themselves.
6. Philosophical Implications
6.1 Dualism vs Monism
Bianconi: dualistic, comparative, geometric
ToE: monistic, generative, pre‑geometric
6.2 Ontological Priority
Bianconi: Geometry → Relative Entropy → Gravity
ToE: Entropy Field → Curvature → Geometry + Matter + Gravity
6.3 Conceptual Coherence
ToE avoids the category mismatch by grounding all physical structures in a single entropic substrate.
7. Conclusion
The conceptual challenge in Bianconi’s “gravity from entropy” framework arises from its dualistic comparison between two metrics of different ontological types (Bianconi's Paradox and Bianconi's Vicarious Induction). This leads to a paradox: gravity is derived from the relative entropy between structures whose existence is not explained (this is Bianconi's Paradox). But Bianconi compels the two structures to be comparable by avoiding the categorical mismatch through her use of an induced metric on matter - this is Bianconi's Vicarious Induction (BVI).
Obidi’s Theory of Entropicity (ToE) resolves these two problems (Bianconi's Paradox - BP and Bianconi's Vicarious Induction - BVI) by replacing the dual‑metric ontology with a monistic entropic field. Distinguishability is measured within this field, and spacetime metrics emerge from its curvature. Gravity becomes a manifestation of entropic geometry rather than a comparison between geometric objects.
Thus, ToE provides a deeper, more coherent foundation for the relationship between entropy, geometry, and gravitation.