Cosmology News

The existence of Dark Matter explains the anomaly in galaxy rotation curves (85%)

COVID-19 was natural in origin (80%).

The Lost Colony of Roanoke colonists have living decedents (55%)

The Mar Saba letter discovered by Morton Smith and containing excerpts from the "Secret Gospel of Mark" is a modern forgery (25%)

D.B. Cooper survived his parachute jump and escaped (30%)

The Hubble Tension can be resolved without new physics or changes to cosmological models (55%)

JonBenét Ramsey was killed by a member of her family (10%)

Lizzie Borden killed her parents (10%)

Aaron Kosminski was Jack the Ripper (35%)

Current Cosmic Ladder estimates are wrong

Current Cosmic Microwave Background estimates are wrong

YES

YES

13.787 ± 1 Gy

Infinite (Big Bounce)

Between 12.5 and 13 billion years

Other

YES

Evolving dark energy with time-dependent properties

Systematic errors in distance measurement techniques

Relativistic backreaction / timescape cosmology (breakdown of global FLRW averaging)

Early dark energy in the early universe

Local cosmic void (KBC void) around the Milky Way

Measurement errors in CMB calibration

Interactions between dark matter and dark energy

New relativistic particles in early universe

Rotating universe model

Vacuum phase transition in early universe

Modified gravity theory (MOND/Milgromian dynamics)

NO

Quantum Mechanics (includes Quantum Computing)

Astrophysics or Cosmology

Condensed Matter Physics

Optics or Photonics

Atomic or Molecular Physics

Geophysics, Climate or Atmospheric Physics

Biophysics

Fluid dynamics

Semiconductor Physics

Superconductivity

Particle Physics

Different observers may have time's arrows pointing in different directions

Anthropic selection: observers necessarily find themselves in regions with increasing entropy

The arrow reflects brute initial conditions; there is no deeper explanation to be had

Growth of quantum entanglement under unitary dynamics explains thermodynamic irreversibility

Gravitational instability and cosmological expansion generate the observed thermodynamic arrow

Inflationary cosmology dynamically selects special low-entropy initial conditions, explaining the arrow

Entropy increase is emergent from coarse-graining and typicality; no deeper micro-physical asymmetry is needed

Time’s arrow arises from asymmetric boundary conditions at both temporal ends (two-time boundary conditions)

The Past Hypothesis is a fundamental lawlike assumption, and a low-entropy beginning fixes the arrow

Landauer’s principle and information-erasure costs make entropy increase a consequence of information processing constraints

Computational irreversibility and algorithmic complexity growth are the deeper source of the arrow

Penrose’s Weyl curvature hypothesis: near-vanishing initial Weyl curvature sets the gravitational arrow

YES

Systematics - Clustering

Systematics - Lensing

New Physics - Late Universe

Other

New Physics - Early Universe

Projection effects