Emergent Expansion Research (E²R)

👋 Who I Am

I’m Eric Petersen, an independent Canadian researcher building an alternative cosmology in which late‑time cosmic expansion emerges as a delayed geometric response to black‑hole‑driven mass redistribution. In this picture, dark matter and dark energy are not two separate mysterious substances but two phases of one effective cosmic medium,  a fabric that has been stretched across cosmic history by the relentless redistribution of mass into the deepest gravitational wells.

Modern cosmology explains the universe by adding invisible ingredients on top of the standard model of gravity. My work asks a different question: what if the large‑scale behaviour of the universe is not driven by unseen fluids, but by geometry itself responding to how mass moves, clumps, and reorganises over time?

🌀 What I’m Working On

At the heart of my research is Mass Redistribution Expansion Theory — MRET. The core idea remains what it has always been: black holes are the engine. As matter flows into the deepest gravitational reservoirs over billions of years, spacetime doesn’t just sit still; it responds. That response, delayed and accumulated, produces the acceleration we observe today; not as a permanent vacuum energy, but as the memory of mass redistribution written into the cosmic fabric.

Earlier versions of the theory (MRET v5.2 and before) established the basic framework: one dark sector, two behaviours (clumped and smooth), linked by a conservative exchange triggered by black‑hole accretion. But the work has now moved decisively forward.

The new Saturated Fabric Framework (June 2026) is the most complete and rigorously tested version of this idea. It treats the dark sector as a single cosmic fabric that has been driven toward a saturated limit, locked to the ΛCDM background, while leaving behind a tiny residual ripple; a shape predicted in advance by the causal memory kernel derived from the black‑hole accretion history.

This shift is significant. The project is no longer just about building the theory; it is now about confronting it with real data.

✨ What’s New

Two linked papers now define the project:

• Paper I — The Saturated Fabric Framework lays out the full theoretical architecture: the exchange law, the causal memory kernel, holographic saturation, nonlinear screening, and predictions for supernovae, growth, voids, and environmental expansion.

• Paper II — Delayed Black‑Hole Accretion Kernel Test puts the framework to the fire. It presents:

  • A full‑covariance binned analysis of the Pantheon+ supernova compilation, yielding a clean null (Δχ2 = 0.19, ASN <0.14 mag at 95% CL), exactly as the saturated‑fabric prediction requires.

  • A growth‑rate test using BOSS/eBOSS data, where the MRET kernel shape is disfavoured relative to a generic suppression; consistent with nonlinear screening.

  • A comparison with the DESI 2024 evolving‑dark‑energy hint: the causal memory kernel, with no parameter tuning, predicts an effective dark‑energy equation of state that crosses w=−1 at z≈0.45 — right where DESI sees a hint.

The empirical work is also documented in two fully reproducible Jupyter notebooks, now publicly archived alongside the papers. For the first time, the project includes a converged MCMC exploration of the key parameters; a personal and scientific milestone that moves the work from conceptual sketches toward genuine statistical confrontation with the data.

All of this is available as a single, citable package on Zenodo.
https://zenodo.org/records/20636692 

📈 Why It Matters

What excites me about this work is that it tries to replace cosmic mystery with causal structure. Instead of assuming the universe accelerates because of a permanent vacuum‑like ingredient we do not yet understand, this line of work asks whether acceleration could be the large‑scale response to structure formation, black‑hole growth, and the long‑term redistribution of mass itself.

If that picture is even partly right, it changes how we think about the dark sector. Dark matter, dark energy, structure growth, black holes, and cosmic history stop looking like separate problems patched together and start looking more like different expressions of one underlying process. The deeper ambition is not just to tweak cosmology, but to make it feel more physically connected.

🧭 What’s Next

The theory is now built, and the first round of tests is complete. The results are honest: supernovae see nothing, growth sees a shape mismatch consistent with screening, and a unique, parameter‑free prediction — the DESI crossing redshift — is on the table for future surveys to confirm or refute.

The next steps are clear: push the residual searches to the next generation of data (DESI, Euclid), refine the growth tests with nonlinear and environmental probes, and continue building the statistical infrastructure that turns a framework into a fully quantitative competitor.

Maybe the universe is not expanding because something mysterious is pushing it apart.
Maybe it’s expanding because mass moves, geometry responds, and we’ve been reading the story backwards.

All work is open access. I welcome engagement from researchers, skeptics, and curious explorers alike. If you’re looking for a fresh way to think about expansion, gravity, black holes, and the dark sector, E²R is an invitation to look again.