New Cosmology Model Explains Galaxy Seeds Without Inflaton, Using 2nd-Order Quantum Gravity Effects
Updated
Updated · Neowin · Aug 14
New Cosmology Model Explains Galaxy Seeds Without Inflaton, Using 2nd-Order Quantum Gravity Effects
1 articles · Updated · Neowin · Aug 14
Summary
Researchers proposed a cosmological model in which the early Universe generated the density seeds of galaxies without an inflaton field, relying instead on De Sitter space and quantum fluctuations in space-time.
Second-order interactions among tensor fluctuations—gravitational-wave ripples in space-time—produce scalar perturbations, the density variations that later grow into galaxies and larger cosmic structure.
The team calculated a near scale-invariant power spectrum, matching a key feature long associated with inflation models, and said the scalar fluctuations can become much stronger than the original tensor modes.
The proposal also includes a natural transition to a radiation-dominated phase, removing the need for a separate mechanism to end rapid early expansion.
The model remains theoretical and will stand or fall on future tests against cosmic microwave background data, gravitational-wave signals and the observed distribution of matter.