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The search for dark matter (DM) is one of the most active and challengingareas of current research. Possible DM candidates are ultralight fields such asaxions and weak interacting massive particles (WIMPs). Axions piled up in thecenter of stars are supposed to generate matter/DM configurations withoscillating geometries at a very rapid frequency, which is a multiple of theaxion mass $m_B$ [1,2]. Borra and Trottier recently found peculiar ultrafastperiodic spectral modulations in $236$ main sequence stars in the sample of$2.5$ million spectra of galactic halo stars of the Sloan Digital Sky Surveythat were interpreted as optical signals from extraterrestrial civilizations,possible candidates for the search for extraterrestrial intelligence (SETI)program [3]. We argue, instead, that this could be the first indirect evidenceof bosonic axion-like DM fields inside main sequence stars, with a stableradiative nucleus, where a stable DM core can be hosted. These oscillationswere not observed in earlier stellar spectral classes probably because of theimpossibility of starting a stable oscillatory regime due to the presence ofchaotic motions in their convective nuclei. The axion mass values, $(50 < m_B <2.4 \times 10^{3})~ \mathrm{\mu eV}$, obtained from the frequency rangeobserved by Borra and Trottier, $(0.6077< f <0.6070$) THz, agree with therecent theoretical results from high-temperature lattice quantum chromodynamics[4,5].

Can the periodic spectral modulations of the 236 SETI candidate Sloan Survey stars be due to Dark Matter effects?