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Scientists Discover Way to Send Information into Black Holes Without Using Energy

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What If Dark Matter Has Two Forms?

For decades, scientists have been chasing one of the greatest mysteries of modern science—dark matter. We know it exists. We know it makes up a large portion of the universe. But surprisingly, we still don’t know what it actually is.

Now, a new study published in the Journal of Cosmology and Astroparticle Physics proposes a bold and exciting idea: what if dark matter doesn’t come in just one form, but two?

This simple question could completely change how scientists search for it—and how they interpret the signals they observe in space.

The Mystery of Dark Matter

Dark matter is invisible. It doesn’t emit, absorb, or reflect light, which makes it impossible to see directly. Scientists only know it exists because of its gravitational effects on galaxies and stars.

For example, galaxies rotate much faster than they should based on visible matter alone. Something unseen must be adding extra mass—and that “something” is what we call dark matter.

For years, researchers have tried to detect dark matter particles directly or indirectly. One popular method is to look for signals created when dark matter particles collide and destroy each other, a process known as annihilation.

A Strange Signal from Our Galaxy

One of the most intriguing clues comes from the center of our galaxy, the Milky Way.

Scientists using the Fermi Gamma-ray Space Telescope have detected an unusual excess of gamma rays—high-energy light—coming from this region. This glow appears roughly spherical and surrounds the galactic center.

Some scientists believe this could be a sign of dark matter particles annihilating and producing gamma rays.

However, there’s a problem.

The Missing Signal Problem

If dark matter is responsible for this gamma-ray excess, then similar signals should appear in other places too—especially in dwarf galaxies.

Dwarf galaxies are small, faint galaxies that contain a lot of dark matter but very few stars. This makes them perfect “clean laboratories” for studying dark matter, since there is less background noise from other sources.

But here’s the puzzle: scientists don’t see the same gamma-ray signal in these dwarf galaxies.

This has led many researchers to question whether the Milky Way signal is really caused by dark matter—or something else, like pulsars (rapidly spinning neutron stars).

A New Idea: Two Types of Dark Matter

This is where the new study introduces a fresh perspective.

Instead of assuming that dark matter is made of just one type of particle, researchers suggest it might consist of two slightly different particles.

These particles would need to find each other in order to annihilate and produce gamma rays.

Why This Changes Everything

In this new model, the key factor is not just the presence of dark matter, but the balance between the two types of particles.

  • In galaxies like the Milky Way, the two types of particles might exist in similar amounts.
    👉 This increases the chances of collisions and produces a detectable gamma-ray signal.

  • In dwarf galaxies, one type of particle might dominate while the other is rare.
    👉 This makes collisions extremely unlikely, so no gamma-ray signal appears.

This means the absence of a signal in dwarf galaxies is no longer a contradiction—it actually fits the theory.

Rethinking Old Assumptions

Traditional models usually assume one of two things:

  1. Dark matter particles annihilate at a constant rate everywhere

  2. The annihilation rate depends on particle speed

In both cases, scientists expected consistent signals across different galaxies. When those signals didn’t appear, it created doubt.

But the two-particle model introduces a new factor—environmental dependence.

In simple words, dark matter behavior might change depending on where it is in the universe.

The Role of Future Observations

To test this theory, scientists will need more precise data—especially from dwarf galaxies.

The Fermi Gamma-ray Space Telescope is still collecting data, and future observations could help answer key questions:

  • Do dwarf galaxies emit faint gamma rays that we haven’t detected yet?

  • Is the particle balance different in different galaxies?

  • Could other astrophysical sources explain the signals instead?

The answers will help scientists confirm or reject this new model.

Not the Final Answer—But a Big Step Forward

It’s important to understand that this idea doesn’t prove what dark matter is. Instead, it offers a new way of thinking.

Science often progresses not by finding immediate answers, but by asking better questions.

This model shows that:

  • A missing signal doesn’t always mean failure

  • Complex systems may require more flexible explanations

  • The universe might be more diverse than we imagined

Why This Matters

Understanding dark matter isn’t just about solving a cosmic puzzle. It’s about understanding the very structure of the universe.

Dark matter:

  • Shapes galaxies

  • Influences cosmic evolution

  • Makes up about 85% of all matter

If it truly has multiple states or components, it could open the door to entirely new physics beyond our current theories.

Final Thoughts

The idea that dark matter might come in two different forms is both simple and revolutionary.

It explains why we see signals in some places but not others. It challenges long-standing assumptions. And most importantly, it reminds us that the universe still holds many secrets.

As new data arrives and technology improves, we may finally get closer to answering one of the biggest questions in science:

What is dark matter really made of?

Until then, theories like this keep the search alive—and more exciting than ever.

Reference: Asher Berlin et al, dSph-obic dark matter, Journal of Cosmology and Astroparticle Physics (2026). On arXiv DOI: 10.48550/arxiv.2504.12372

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