Compare · Before the Universe

Loop Quantum Big Bounce vs Conformal Cyclic Cosmology (CCC)

Cyclic & Bouncing Cosmologies· within family

	Loop Quantum Big Bounce Speculative	Conformal Cyclic Cosmology (CCC) Speculative
Proposed	2001	2005
Key figures	Abhay Ashtekar, Martin Bojowald, Parampreet Singh	Roger Penrose
In one sentence	A previous contracting universe bounced, quantum geometry prevented the collapse from becoming a singularity.	A previous "aeon" existed. Its conformally smooth heat-death geometry became our Big Bang.
Predictions	Quantum bounce at Planck density Modified CMB power spectrum at large angular scales Pre-Bang contracting universe phase	Concentric CMB rings (Hawking points) Smooth conformal transition, no [[singularity]] Massless [[dark matter]] required at aeon boundary
Where it breaks	Effects only at Planck scale, not currently testable LQG itself is incomplete CMB corrections sub-dominant to cosmic variance	Independent analyses find rings consistent with noise Requires massless dark matter, not established Community consensus is largely skeptical Bodnia et al. (2024) find no statistically significant low-variance circles or Hawking points in Planck/WMAP data using a ResNet18 ML pipeline, contradicting earlier Gurzadyan-Penrose claims.
Key unresolved problem	The out-of-reach test: the bounce in loop quantum cosmology only shows up at Planck-scale densities, energies far beyond any experiment we can imagine building, so the prediction stays untestable for now.	The missing fingerprint: other teams cannot find the predicted Hawking-point rings, faint circles in the cosmic microwave background, leaving CCC's one big observational claim statistically unsupported.
Reader vote	100% · 1 vote	0% · 0 votes

Loop Quantum Big Bounce

2001 · Speculative

Conformal Cyclic Cosmology (CCC)

2005 · Speculative

Proposed

2001

2005

Key figures

Abhay Ashtekar, Martin Bojowald, Parampreet Singh

Roger Penrose

In one sentence

A previous contracting universe bounced, quantum geometry prevented the collapse from becoming a singularity.

A previous "aeon" existed. Its conformally smooth heat-death geometry became our Big Bang.

Predictions

Quantum bounce at Planck density
Modified CMB power spectrum at large angular scales
Pre-Bang contracting universe phase

Concentric CMB rings (Hawking points)
Smooth conformal transition, no [[singularity]]
Massless [[dark matter]] required at aeon boundary

Where it breaks

Effects only at Planck scale, not currently testable
LQG itself is incomplete
CMB corrections sub-dominant to cosmic variance

Independent analyses find rings consistent with noise
Requires massless dark matter, not established
Community consensus is largely skeptical
Bodnia et al. (2024) find no statistically significant low-variance circles or Hawking points in Planck/WMAP data using a ResNet18 ML pipeline, contradicting earlier Gurzadyan-Penrose claims.

Key unresolved problem

The out-of-reach test: the bounce in loop quantum cosmology only shows up at Planck-scale densities, energies far beyond any experiment we can imagine building, so the prediction stays untestable for now.

The missing fingerprint: other teams cannot find the predicted Hawking-point rings, faint circles in the cosmic microwave background, leaving CCC's one big observational claim statistically unsupported.

Reader vote

100% · 1 vote

0% · 0 votes