  A search for a new scalar field, called moduli, has been performed using the
cryogenic resonant-mass AURIGA detector. Predicted by string theory, moduli may
provide a significant contribution to the dark matter (DM) component of our
universe. If this is the case, the interaction of ordinary matter with the
local DM moduli, forming the Galaxy halo, will cause an oscillation of solid
bodies with a frequency corresponding to the mass of moduli. In the sensitive
band of AURIGA, some $100\,\mathrm{Hz}$ at around $1\,\mathrm{kHz}$, the
expected signal, with a $Q=\tfrac{\triangle f}{f}\sim10^{6}$, is a narrow peak,
$\triangle f\sim1\,\mathrm{mHz}$. Here the detector strain sensitivity is
$h_{s}\sim2\times10^{-21}\,\mathrm{Hz^{-1/2}}$, within a factor of $2$. These
numbers translate to upper limits at $95\%\,C.L.$ on the moduli coupling to
ordinary matter $d_{e}\lesssim10^{-5}$ around masses
$m_{\phi}=3.6\cdot10^{-12}\,\mathrm{eV}$, for the standard DM halo model with
$\rho_{DM}=0.3\,\mathrm{GeV/cm^{3}}$.
