TL;DR
This comprehensive review covers axion models, their cosmological production, effects on structure formation, and detection methods, highlighting their role in solving fundamental physics problems and dark matter mysteries.
Contribution
It provides an extensive synthesis of axion theory, cosmological implications, and experimental searches, integrating recent advances and highlighting open questions.
Findings
Axions can solve the strong CP problem.
Axions are viable dark matter candidates.
Constraints from CMB and LSS limit axion properties.
Abstract
1. Introduction 2. Models: the QCD axion; the strong CP problem; PQWW, KSVZ, DFSZ; anomalies, instantons and the potential; couplings; axions in string theory 3. Production and I.C.'s: SSB and non-perturbative physics; the axion field during inflation and PQ SSB; cosmological populations - decay of parent, topological defects, thermal production, vacuum realignment 4. The Cosmological Field: action; background evolution; misalignment for QCD axion and ALPs; cosmological perturbation theory - i.c.'s, early time treatment, axion sound speed and Jeans scale, transfer functions and WDM; the Schrodinger picture; simualting axions; BEC 5. CMB and LSS: Primary anisotropies; matter power; combined constraints; Isocurvature and inflation 6. Galaxy Formation; halo mass function; high-z and the EOR; density profiles; the CDM small-scale crises 7. Accelerated expansion: the c.c. problem; axion…
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