Emergent Expansion Research (E²R)
👋 Who I Am
I’m Eric Petersen, an independent Canadian researcher building an alternative cosmology in which late-time expansion emerges as a delayed geometric response to black-hole-driven mass redistribution, with dark matter and dark energy reinterpreted as two behaviours of one effective geometric medium.
Most modern cosmology explains that expansion using dark matter and dark energy, two powerful ideas that fit the data well, but still leave the deeper physical picture unresolved. My work asks a different question: what if the universe’s large-scale behaviour is not being driven by invisible ingredients added on top, but by geometry itself responding to how mass moves, clumps, and redistributes over time?
🌀 What I’m Working On
At the heart of my research is Mass Redistribution Expansion Theory, or MRET. In this picture, cosmic expansion is not caused by a mysterious repulsive fluid. Instead, it emerges as a delayed geometric response to the way matter reorganizes itself across cosmic time, especially as more matter falls into deep gravitational reservoirs like black holes.
The newest paper, MRET v5.2, presents the clearest baseline version of that idea so far. It treats the dark sector as one effective geometric medium with two behaviours: a clumped, dust-like mode that plays the role usually assigned to dark matter, and a smooth, horizon-coupled mode that plays the role usually assigned to dark energy. Rather than treating them as separate substances, MRET treats them as two faces of the same underlying cosmic bookkeeping.
A big part of the v5.2 framework is timing. The theory does not say black hole growth and cosmic acceleration happen in lockstep. It says the expansion response is delayed. In the baseline model, black-hole-driven redistribution happens first, then spacetime responds later through a causal buildup-decay kernel. That lag is one of the main features that makes the theory distinct and testable.
More broadly, E²R is where I develop this whole line of work in public: the theory papers, the explainers, the refinements, and the ongoing effort to connect the framework to real observations without abandoning standard General Relativity. The goal is not to be contrarian for its own sake. The goal is to see whether the expansion of the universe can be understood in a more physical, causal, and unified way.
✨ What’s New in v4.2
MRET v5.2 is the clearest and most complete version of the theory I’ve written so far. In this paper, I’m trying to show that late-time cosmic expansion may not need a separate dark-energy fluid at all. Instead, the idea is that expansion could be the large-scale geometric response to mass being redistributed over time, especially as more of it ends up in deep gravitational reservoirs like black holes. This version lays that picture out more cleanly, with clearer definitions, tighter math, and a more concrete framework for how the whole mechanism fits inside standard General Relativity rather than replacing it.
What I’m really trying to accomplish with v5.2 is to take the bigger intuition behind MRET and turn it into something much more focused and usable. That means spelling out how the two effective behaviours of the dark sector work, showing how black hole growth can act as the driver of a delayed cosmic response, and building a model that connects those ideas to actual late-time observations in a realistic way. The goal is not to overturn cosmology with wild departures, but to offer a more physical and unified explanation for the same universe we already observe.
It also gives the theory a much sharper observational shape. Rather than predicting dramatic changes everywhere, v5.2 points to small, meaningful late-time effects: a slight low-redshift H₀ uplift, a subtle supernova residual feature in the middle redshift range, and modest shifts in structure growth, all while keeping standard lensing behaviour intact. In other words, I’m trying to show that you can keep the strengths of the current cosmological picture, but reinterpret the cause beneath it in a way that is more connected to structure formation, black holes, and the evolving geometry of the universe.
📈 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 understand, MRET asks whether that acceleration could be the large-scale response to structure formation itself. That opens the door to a different way of thinking about dark matter, dark energy, black holes, and cosmic history as parts of one connected system rather than disconnected patches.
If that picture is even partly right, it could help explain why late-time acceleration turns on when structure becomes important, why black-hole growth may matter more to cosmology than usually assumed, and why the best clues might live in subtle low-redshift signals rather than dramatic departures from the standard model.
🧭 What’s Next
The next step is straightforward: keep confronting the theory with data. Right now that means pushing harder on black-hole growth reconstructions, supernova residuals, low-redshift expansion measurements, growth observables, and underdense environments like cosmic voids. The aim is not to endlessly add moving parts. It is to test a fixed baseline idea and find out whether the sky supports it.
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 and published through my Zenodo archive, and I welcome engagement from researchers, skeptics, and curious explorers alike.
If you’re looking for a fresh way to understand why the universe expands, and how geometry, gravity, and information may be part of the same equation, E²R is your invitation to look again.