Entangled News

YES

YES

YES

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

NO

Supervoid (a huge void between us and the primordial CMB)

Statistical fluctuation within standard inflation

Cosmic strings or cosmic texture defects

Foreground contamination from nearby galaxies

Primordial gravitational wave signatures

Quantum entanglement imprint from another universe

NO

YES

YES

YES