Gravitational Waves from Rapid Structure Formation on Microscopic Scales before Matter-Radiation Equality

Area of Science:

• Cosmology and astrophysics
• Fundamental physics

Background:

• Scalar fields are hypothetical entities that can mediate forces.
• These forces can be significant in the early Universe, influencing structure formation.
• Gravitational instability is a known mechanism for structure growth.

Purpose of the Study:

• To investigate the potential for scalar fields to drive structure formation.
• To identify a unique observational signature of scalar field activity.
• To assess the detectability of this signature in future gravitational wave experiments.

Main Methods:

• Theoretical modeling of scalar field interactions and their cosmological effects.
• Analysis of potential gravitational wave signals generated by scalar field-driven instabilities.
• Comparison of predicted signals with the sensitivity of future gravitational wave detectors.

Main Results:

• Scalar fields can mediate attractive forces stronger than gravity on small scales.
• These forces can lead to an instability that promotes the growth of cosmic structures.
• A distinct gravitational wave signature associated with these processes has been identified.

Conclusions:

• Scalar fields offer a novel mechanism for early Universe structure formation.
• The predicted gravitational wave signature is a promising target for future cosmological observations.
• Detection of this signature would provide evidence for the existence and influence of scalar fields.