TY - JOUR

T1 - Cosmic voids and filaments from quantum gravity

AU - Ambjorn, J.

AU - Drogosz, Z.

AU - Gizbert-Studnicki, J.

AU - Gorlich, A.

AU - Jurkiewicz, J.

AU - Nemeth, D.

PY - 2021/8

Y1 - 2021/8

N2 - Using computer simulations, we study the geometry of a typical quantum universe, i.e., the geometry one might expect before a possible period of inflation. We display it using coordinates defined by means of four classical scalar fields satisfying the Laplace equation with nontrivial boundary conditions. They are a close analogue of the harmonic coordinate condition used in the context of GR (Kuchar and Torre in Phys Rev D 43:419-441, 1991). It is highly nontrivial that these ideas can be applied to understand the structures which appear in very irregular and fluctuating geometries. The field configurations reveal cosmic web structures surprisingly similar to the ones observed in the present-day universe.

AB - Using computer simulations, we study the geometry of a typical quantum universe, i.e., the geometry one might expect before a possible period of inflation. We display it using coordinates defined by means of four classical scalar fields satisfying the Laplace equation with nontrivial boundary conditions. They are a close analogue of the harmonic coordinate condition used in the context of GR (Kuchar and Torre in Phys Rev D 43:419-441, 1991). It is highly nontrivial that these ideas can be applied to understand the structures which appear in very irregular and fluctuating geometries. The field configurations reveal cosmic web structures surprisingly similar to the ones observed in the present-day universe.

U2 - 10.1140/epjc/s10052-021-09468-z

DO - 10.1140/epjc/s10052-021-09468-z

M3 - Journal article

VL - 81

JO - The European Physical Journal C: Particles and Fields

JF - The European Physical Journal C: Particles and Fields

SN - 1434-6044

IS - 8

M1 - 708

ER -