Signatures of Moat Regimes in Heavy-Ion Collisions

Area of Science:

• Nuclear Physics
• Quantum Chromodynamics (QCD)
• High-Energy Physics

Background:

• Exploring the QCD phase structure at low temperatures and nonzero densities is crucial.
• Heavy-ion collisions at low beam energies offer a unique window into this regime.
• Spatially modulated phases with "moat" energy spectra are theoretical possibilities.

Purpose of the Study:

• To investigate the observable consequences of matter freezing out in spatially modulated QCD phases.
• To determine if these phases lead to unique signatures in particle production and correlations.
• To provide guidance for experimental searches in heavy-ion collisions.

Main Methods:

• Theoretical analysis of particle number and correlation distributions.
• Modeling the freeze-out process in hypothetical spatially modulated regimes.
• Comparing predictions for particle spectra and multiparticle correlations.

Main Results:

• Matter freezing out in a spatially modulated phase exhibits particle number and correlation peaks at nonzero momentum.
• This momentum-space signature is significantly more pronounced in multiparticle correlations than in single-particle spectra.
• The predicted effects offer a distinct experimental signature.

Conclusions:

• The study provides a theoretical framework for identifying spatially modulated QCD phases.
• Observed peaks in particle correlations at nonzero momentum could indicate such phases.
• These findings serve as a guide for future experimental searches in heavy-ion collision experiments.