Pre-inflation from the multiverse: can it solve the quadrupole problem in the cosmic microwave background?

Area of Science:

• Cosmology
• Quantum Gravity
• Theoretical Physics

Background:

• Eternal inflation proposes continuous universe creation.
• The Wheeler-DeWitt equation is a key tool in quantum cosmology.
• The cosmic microwave background (CMB) exhibits anomalies on large scales, like the quadrupole issue.

Purpose of the Study:

• To analyze a quantized toy model of eternal inflation.
• To investigate the pre-inflationary phase of sub-universes within a multiverse.
• To determine if this pre-inflationary phase can explain CMB anomalies, specifically the quadrupole issue.

Main Methods:

• Utilizing a quantum-field-theoretical formulation of the Wheeler-DeWitt equation.
• Applying the 'third quantization' method to model universe creation.
• Calculating the influence of the pre-inflationary phase on the CMB power spectrum.

Main Results:

• The eternally inflating universe is modeled as a multiverse with distinct sub-universe phases.
• The pre-inflationary phase of a sub-universe was analyzed from its perspective.
• The specific model analyzed did not resolve the CMB quadrupole issue.

Conclusions:

• The analyzed pre-inflationary phase does not explain the CMB quadrupole anomaly.
• The study suggests potential avenues for resolving the CMB quadrupole issue.
• The third quantization method provides a framework for multiverse cosmology.