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The Galileo for Science Project (G4S₂. 0) is funded by the Italian Space Agency and hasseveral goals in the field of Fundamental Physics to be achieved by exploiting the satellitesof the Galileo-FOC Constellation and the accuracy of their onboard atomic clocks. Inparticular, the clock-bias, estimated in the data reduction of the tracking observationsallows to place constraints on the possible presence of Dark Matter in our galaxy in theform of Domain Walls (DW) eventually produced in the very early Universe by ultralightscalar field (s). The impact of the DW on an atomic clock would provide a delta-liketransient shift on the pseudo-derivative of the clock-bias. Such signal depends both on thenature of the clock and the characteristics of the ultralight scalar comprising the DW. Ongoing work on the clock-bias will be introduced as regards to data pre-processing andsimulations on false alarm and detection efficiency.
Marco et al. (Mon,) studied this question.
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