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Conformal Cyclic Cosmology (CCC) vs Loop Quantum Big Bounce

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Cyclic & Bouncing Cosmologies· within family

	Conformal Cyclic Cosmology (CCC) Speculative	Loop Quantum Big Bounce Speculative
Proposed	2005	2001
Key figures	Roger Penrose	Abhay Ashtekar, Martin Bojowald, Parampreet Singh
In one sentence	A previous "aeon" existed. Its conformally smooth heat-death geometry became our Big Bang.	A previous contracting universe bounced, quantum geometry prevented the collapse from becoming a singularity.
Predictions	Concentric CMB rings (Hawking points) Smooth conformal transition, no [[singularity]] Massless [[dark matter]] required at aeon boundary	Quantum bounce at Planck density Modified CMB power spectrum at large angular scales Pre-Bang contracting universe phase
Where it breaks	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.	Effects only at Planck scale, not currently testable LQG itself is incomplete CMB corrections sub-dominant to cosmic variance
Key unresolved problem	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.	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.
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Conformal Cyclic Cosmology (CCC)

2005 · Speculative

Loop Quantum Big Bounce

2001 · Speculative

Proposed

2005

2001

Key figures

Roger Penrose

Abhay Ashtekar, Martin Bojowald, Parampreet Singh

In one sentence

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

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

Predictions

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

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

Where it breaks

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.

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

Key unresolved problem

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.

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.

Reader vote

0% · 0 votes

100% · 1 vote