Universe from a Wine Glass: How Wormholes Ignite Inflation ✦

Original: "Before the Bang: Wormholes at the Dawn of the Universe"

· Panos Betzios, Paul Ghiringhelli, Ioannis D. Gialamas, Olga Papadoulaki

arXiv:2605.13777v2 · 2026-05-13 · CC BY 4.0 · ⏱ 1 min · HEP Theory General Relativity

Euclidean wormholes shaped like wine glasses serve as natural saddle points for the birth of an inflationary Universe, solving the initial conditions problem without fine-tuning.

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The quantum birth of the Universe is not a smooth beginning, but a narrow neck. Euclidean wormholes shaped like wine glasses turn out to be ideal funnels for triggering inflation. This changes our view of cosmic fine-tuning and possibly leaves imprints in the cosmic microwave background. Future telescopes will help distinguish between genesis scenarios.

🎯 The geometry of a wormhole is likened to a wine glass: in Euclidean time, it resembles a narrow neck between two anti-de Sitter abysses. When switched to real time, the neck becomes the starting point of hot expansion — like champagne bursting from a bottle.

🎬 The image of a tunnel connecting 'nothing' to our Universe echoes the fictional portals of 'Interstellar,' but here it gains rigorous mathematical flesh in quantum cosmology.

ds_E^2 = d\tau^2 + a^2(\tau) d\Omega_3^2

Euclidean time τ and scale factor a(τ) describe the geometry of a closed Universe.

\frac{a'^2}{a^2} - \frac{1}{a^2} + \frac{1}{3M_P^2} \left(V(\phi) - \frac{\phi'^2}{2}\right) - \frac{\tilde{\rho}_i}{a^{n_i}} = 0

The sum of curvature, potential, kinetic energy, and matter density contributions determines the evolution of the scale factor.

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Universe from a Wine Glass: How Wormholes Ignite Inflation ✦