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From new results presented in the literature we discuss the hypothesis thatthe ultrafast periodic spectral modulations at $f_S \simeq 0.607$ THz found inthe spectra of $236$ stars of the Sloan Digital Sky Survey (SDSS) [1] were dueto oscillations induced by dark matter (DM) cores in their centers [2] behavingas oscillating boson stars [3,4]. Two additional frequencies in theredshift-corrected SDSS galactic spectra were found [5], $ f_{1,G} \simeq 9.5$THz, the beating between $f_S$ and a spurious frequency, $f_{2,G} \simeq 8.9$THz, introduced during the data analysis [6]. The indication that $f_S$ can bereal is its detection in a real solar spectrum but not in the Kurucz'sartificial solar spectrum [6,7,8]. Then, independent SETI observations of fourof these stars could not confirm with high confidence, but not completelyexclude, the presence of $f_S$ in their power spectra [9] while the radio SETIdeep-learning analysis with artificial intelligence confirmed indirectly $f_S$detecting a narrowband Doppler drifting of radio signals in two of these starsover a sample of $7$ with a high S/N [10]. Numerical simulations suggest thatthe drifting can be due to frequency and phase modulation in time of theobserved frequencies at $1.3-1.7$ GHz with $f_S$. This would imply a DM uppermass limit $m_a \lesssim 2.4 \times 10^{3}~ \mathrm{\mu eV}$ [2] which alsoagrees with the results from the gamma ray burst GRB221009A [11,12,13], laserinterferometry [14], suggesting new physics for the muon g-2 anomaly [15].

Ultrafast modulations in stellar, solar and galactic spectra: Dark Matter and numerical ghosts, stellar flares and SETI