Brief and simplified discernment to complement the following exploration No trace of dark matter halos (phys.org). And all related explorations and quests. And as well as to inspire and encourage global inspiration, aspiration, emancipation, collaboration, efforts, individual-shared-collective common and greater good and responsibilities, and solutions forward:
Since currently dark matter (parts of dark spectra-field) can neither be measured nor detected or can only be inferred though gravity. And as such, currently cannot be inferred though gravity when existed at low concentration. However, when exploring dark matter, dark spectra-field such as dark photon or equivalent should also be explored in parallel or in conjunction since they are irreducible or knowing one can give insights to the other. And vice versa.
Dark matter and energy need to be analyzed not only as irreducible parts of Dark spectra-field. Rather, also as irreducible dark spectra-field of Unified spectra-field. And of Universal Unified spectra-field of Universal process and mechanism of Being and Becoming as parts of sum of parts of Wholeness since there are subtle and hidden or underlying processes and mechanism as had discerned in diverse ways in diverse past discernmnts such as most recent On The Nature of Duality and Non-Duality - EPISTEMOLOGY OF LIFE AND ONTOLOGY OF EXISTENCE FOUNDATION AND INSTITUTE (epistemologyontologyfoundationinstitute.org), On Universal Unified Spectra-Field - EPISTEMOLOGY OF LIFE AND ONTOLOGY OF EXISTENCE FOUNDATION AND INSTITUTE (epistemologyontologyfoundationinstitute.org), On The Nature of Duality and Non-Duality - EPISTEMOLOGY OF LIFE AND ONTOLOGY OF EXISTENCE FOUNDATION AND INSTITUTE (epistemologyontologyfoundationinstitute.org), and among past others.
Otherwise, explore either as reducible dark matter or dark energy and reducible from observable from observable spectra-field and reducible from unified sepctra-field and reducible from universal unified spectra-field would lead to incorrecct and false analyses. And therefore, incorrect results and false empirical data
And as an exploration illustration: TGD diary: The mysterious precession of the Earth's spin axis from the TGD point of view (matpitka.blogspot.com)
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Epistemology of Life and Ontology of Existence Foundation and Institute