TL;DR
This paper proposes adding an evanescent matter component with a fifth force to LCDM cosmology to better explain galaxy formation and the minimal environmental impact observed on ellipticals and spiral galaxies.
Contribution
It introduces a simple model of evanescent matter with evolving mass and a fifth force to address discrepancies in galaxy formation within LCDM.
Findings
Evanescent matter can facilitate early galaxy assembly.
The model suggests a mechanism for isolated protogalaxy formation.
Potential to reconcile galaxy evolution with environmental invariance.
Abstract
The LCDM cosmology offers a picture for galaxy formation that is broadly promising but difficult to reconcile with the evidence that environment has had strikingly little effect on the evolution of ellipticals and pure disk spiral galaxies. Reconciliation might be aided by adding to LCDM an evanescent component of matter with evolving mass and a fifth force large enough to aid early assembly of more nearly isolated protogalaxies. I present a simple illustration.
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