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VacuSIP, an Improved InEx Method for In Situ Measurement of Particulate and Dissolved Compounds Processed by Active Suspension Feeders

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Vacuum sampling in the landscape during inflation.

Hooman Davoudiasl¹, Saswat Sarangi, Gary Shiu

¹Department of Physics, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.

Physical Review Letters

|November 13, 2007

Summary

This summary is machine-generated.

Sampling multiple vacua during cosmic inflation can create domain walls. Big Bang Nucleosynthesis success requires the energy scale of these walls to exceed 10 TeV, or 10^-5 MP if black holes form and reheat the universe.

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Area of Science:

Cosmology
Particle Physics
Theoretical Physics

Background:

Cosmic inflation is a leading theory for the early universe.
The concept of a landscape suggests a vast number of possible vacuum states.
Domain walls can form when different regions of the universe settle into distinct vacuum states.

Purpose of the Study:

To investigate the cosmological consequences of sampling multiple vacua during inflation.
To determine the constraints on the energy scale of domain wall barriers.
To ensure consistency with Big Bang Nucleosynthesis (BBN) observations.

Main Methods:

Phenomenological analysis of vacuum sampling during inflation.
Calculation of domain wall properties and their energy scale (mu).
Assessment of BBN constraints on cosmological models.

Main Results:

The success of Big Bang Nucleosynthesis (BBN) constrains the domain wall energy scale to mu >= 10 TeV.
If domain walls dominate and form black holes, a lower bound of mu >= 10^-5 MP is derived.
These black holes must reheat the universe sufficiently for BBN and cannot contribute to dark matter.

Conclusions:

The energy scale of domain wall barriers is tightly constrained by early universe cosmology.
The model is consistent with BBN, provided specific conditions on vacuum non-degeneracy or black hole reheating are met.
The study rules out certain cosmological scenarios involving domain walls and black holes contributing to dark matter.