English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

Axion-like fields are naturally generated by a mechanism of anomalycancellation of one or more anomalous gauge abelian symmetries at the Planckscale, emerging as duals of a two-form from the massless bosonic sector ofstring theory. This suggests an analogy of the Green-Schwarz mechanism ofanomaly cancellation, at field theory level, which results in one or moreStueckelberg pseudoscalars. In the case of a single Stueckelberg pseudoscalar$b$, vacuum misalignments at phase transitions in the early Universe at the GUTscale provide a small mass - due to instanton suppression of the periodicpotential - for a component of $b$, denoted as $\chi$ and termed the"axi-Higgs", which is a physical axion-like particle. The coupling of theaxi-Higgs to the gauge sector via Wess-Zumino terms is suppressed by the Planckmass, which guarantees its decoupling, while its angle of misalignment isrelated to $M_{GUT}$. We build a gauged $E_6\times U(1)$ model with anomalous$U(1)$. It contains both an automatic invisible QCD axion and an ultra-lightaxi-Higgs. The invisible axion present in the model solves the strong CPproblem and has mass in the conventional range while the axi-Higgs, which canact as dark matter, is sufficiently light ($10^{-22} \textrm{ eV} < m_{\chi} <10^{-20} \textrm{ eV}$) to solve short-distance problems which confront othercold dark matter candidates.

Dark Matter as Ultralight Axion-Like particle in $E_6 \times U(1)_X$ GUT with QCD Axion