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GR: Fachverband Gravitation und Relativitätstheorie

GR 16: Quantum Gravity III

GR 16.1: Vortrag

Freitag, 23. März 2018, 11:00–11:15, NW-Bau - HS3

Pre-inflation from the multiverse and its effect on the cosmic microwave background — Mariam Bouhmadi-López^1,2, •Manuel Krämer³, João Morais¹, and Salvador Robles-Pérez^4,5 — ¹Department of Theoretical Physics, University of the Basque Country UPV/EHU, Bilbao, Spain — ²IKERBASQUE, Basque Foundation for Science, Bilbao, Spain — ³Instytut Fizyki, Uniwersytet Szczeciński, Szczecin, Poland — ⁴Instituto de Física Fundamental, CSIC, Madrid, Spain — ⁵Estación Ecológica de Biocosmología, Medellín, Spain

We present two models of constructing a multiverse in the third quantization formalism, which results from a quantum-field-theoretical formulation of the Wheeler–DeWitt equation. In the first model based on eternal inflation, this formalism converts the eternally inflating universe into an ensemble of sub-universes that exhibit a distinctive pre-inflationary phase. Assuming that our observable universe is represented by such a sub-universe, we calculate the effect of the pre-inflationary phase onto the primordial scalar power spectrum and find that there is a suppression of power on the largest scales followed by a bump leading to an enhancement. In order to get a sizable effect for the suppression to explain the observed quadrupole anomaly in the CMB, the bump is enhanced too much to be compatible with the CMB data. In the second model, which involves an explicit quantum interaction between the sub-universes, we obtain a different pre-inflationary phase that better fits the CMB data and might even lead us towards an explanation of the CMB quadrupole discrepancy.