Search for light scalar Dark Matter candidate with AURIGA detector

Abstract

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 $Q=\frac{△f}{f}\sim 10^6$, is a narrow peak, $△f\sim 1\mathrm{mHz}$. Here the detector strain sensitivity is $h_s\sim 2\times 10^{-21}\mathrm{H}{\mathrm{z}}^{-1/2}$, within a factor of $2$. These numbers translate to upper limits at $95\%C.L.$ on the moduli coupling to ordinary matter $d_e\lesssim 10^{-5}$ around masses $m_{\varphi }=3.6\cdot 10^{-12}\mathrm{eV}$, for the standard DM halo model with ${\rho }_{DM}=0.3GeV/c{\mathrm{m}}^3$.

arXiv comment5 pages, 5 figures

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