7.4.1 Axiverse

^[1]<ol><li>Johnson:2023onr</li><li>Hashimoto:2012vsa</li><li>Bachas:2023ixh</li><li>Johnson:1998pc</li><li>Lu:2025awh</li><li>Recknagel:2013uja</li></ol> \subsection{Effective actions} \subsection{As BPS SUGRA solitons} \subsection{D-branes moving and merging} \subsection{Creation/Annihilation of D-branes} \subsection{Multiple coincident D-branes} \subsection{D-brane geometry} ^[2]<ol><li>Douglas:1999ge</li></ol> \subsection{Stringy AdS/CFT from $D$-branes} \subsubsection{The decoupling limit}

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