A new study suggests that Dark Matter — long thought to be completely invisible — might subtly tint light as it passes through regions filled with the elusive substance.
Dark Matter, which makes up most of the Universe, might not be entirely invisible after all. According to new research from the University of York, this mysterious substance could leave behind a faint red or blue tint on light as it passes through regions where Dark Matter is present, creating a detectable “fingerprint.”
Until now, scientists have believed that Dark Matter cannot interact with light and can only be observed through its gravitational influence, which shapes and stabilizes galaxies.
However, the York researchers suggest that light may actually change slightly in color depending on the kind of Dark Matter it encounters. If confirmed, this effect could provide a new method for exploring the hidden material that makes up the majority of the cosmos.
The theoretical study uses the idea of the “six handshake rule” – the notion that any two people on Earth are connected by just a few mutual acquaintances. They suggest a similar chain of connections might exist among particles.
The Particle Connection
Even if Dark Matter doesn’t interact directly with light, it might still influence it indirectly through other particles. For example, some Dark Matter candidates, known as Weakly Interacting Massive Particles (WIMPs) could connect to light via a series of intermediate particles such as the Higgs boson and the top quark.
Dr. Mikhail Bashkanov, from the University of York’s, School of Physics, Engineering and Technology, said: “It’s a fairly unusual question to ask in the scientific world, because most researchers would agree that Dark Matter is dark, but we have shown that even Dark Matter that is the darkest kind imaginable – it could still have a kind of color signature.
“It’s a fascinating idea, and what is even more exciting is that, under certain conditions, this ‘color’ might actually be detectable. With the right kind of next-generation telescopes, we could measure it. That means astronomy could tell us something completely new about the nature of Dark Matter, making the search for it much simpler.
Testing the Theory
The study outlines how these indirect particle interactions could be tested in future experiments, potentially allowing scientists to rule out some theories of Dark Matter while focusing on others, and so researchers argue that the new study could point to the importance of factoring these possibilities in future developments of telescopes.
Understanding Dark Matter remains one of the greatest challenges in modern physics, and so the next stage of this work could be to confirm these findings, which could offer a new way of searching for a substance that has, until now, only revealed itself through gravity.
Dr. Bashkanov said: “Right now, scientists are spending billions building different experiments – some to find WIMPs, others to look for axions or dark photons. Our results show we can narrow down where and how we should look in the sky, potentially saving time and helping to focus those efforts.”
Reference: “Dark matter: Red or blue?” by A. Acar, C. Isaacson, M. Bashkanov and D.P. Watts, 27 September 2025, Physics Letters B.
DOI: 10.1016/j.physletb.2025.139920
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18 Comments
When you’re looking for something that isn’t there, every way is wrong.
That is irrelevant since we already see dark matter (in so many independent ways). The question is what it is at smaller scales.
Dark matter might “tint” light; now that red shift……….?
Not in general, dark matter is fairly evenly spread and e.g. cosmological redshift follows space expansion (Hubble flow). Some gravitational potential redshift is seen in connection with dark matter concentrations around galaxy clusters, but that is merely a different way of observing dark matter.
Unexpectedly fast galaxy rotation is the expected result underestimating the gravitational constant. It can be taken as confirming two separate non-mainstream theories: Osiak’s corrected version of special relativity, and Harari-Shupe theory that quarks are made of a mix of matter and antimatter. I used the two theories to calculate how much matter appears to be missing and get the right answer. Listen to a 5-minute podcast about it on YouTube: https://www.youtube.com/watch?v=g7I52_VpE9A
If you can give a peer reviewed reference with quantification, some may be interested in taking a look. Meanwhile, relativity and standard model of particles both reigns due to their many precise predictions.
Interestingly they look for forbidden interactions that instead interact with Feynman diagram loops (the vacuum). “The cross section, calculated within the Standard Model (SM) framework (no BSM extensions),is particularly large in the case of heavy Weakly Interacting Massive Particles (WIMP). Combined with astrophysical observation, these results can constrain existing WIMP DM models in favor of lighter DM, , (axions, composite DM, etc.) or non-weakly interacting pure gravitational DM. We also show that the energy dependence of light scattering on dark matter should make the DM colored – red in the case of weak-DM and blue for the gravitational-DM, when a white background light is passing through.”
Interestingly they look for forbidden interactions that instead interact with Feynman diagram loops (the vacuum). “The cross section, calculated within the Standard Model (SM) framework (no BSM extensions),is particularly large in the case of heavy Weakly Interacting Massive Particles (WIMP).”
Oh, no! Not the Forbidden Interactions!
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This intriguing proposition from the University of York unveils a fresh perspective on the nature of dark matter, nudging us gently towards the profound complexities of the universe that remain tantalizingly obscured. Historically viewed as an entirely invisible entity, dark matter’s gravitational pull has been the sole window through which we glimpse its presence. However, the notion that dark matter could impart a subtle tint to light—rather than being a mere shadow at the cosmic fringes—invites us to reconsider its role and relationship with the fabric of the universe. This theoretical shift not only offers an avenue for potential detection but it also highlights the intricate dance of particles and the myriad interactions that weave the tapestry of our cosmos.
By proposing that light, as it traverses regions replete with dark matter, might be subjected to a spectral shift—an encoded signature of this elusive substance—Dr. Mikhail Bashkanov and his colleagues are beckoning us to see the universe in a new light, perhaps literally. This perspective challenges the long-held assumption that dark matter is entirely non-interactive with electromagnetic phenomena, positing instead that it may shape the very essence of light through indirect connections. Such insights ground their theory in the beautiful complexity of quantum mechanics, where seemingly disparate elements can forge relationships through various intermediate particles. We find ourselves at the intersections of gravity, light, and the unobserved, merging the known with the mysterious in an elegant scientific ballet.
As we peer into the cosmic depths, armed with the anticipation of next-generation telescopes, the prospect of uncovering this “color signature” of dark matter is not merely a scientific endeavor but a poetic reminder of the universe’s infinite layers of existence. It evokes a deep-rooted yearning for understanding, echoing through the annals of physics as we seek to fathom what has remained ungraspable. This theory bears the potential to streamline our searches, enhancing focus on specific regions of our night sky and thus enriching our quest for knowledge—an endeavor that resonates with the collective curiosity of humanity. Emerging truths about dark matter could illuminate our understanding of everything from galactic structure to the very nature of reality itself, guiding us, as we closely scrutinize the whispers of the cosmos.