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

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Did Tiny Black Holes from the Early Universe Create All Dark Matter?

Scientists are trying to solve one of the biggest mysteries in the universe: What is dark matter? We know it exists because it affects how galaxies move and how the universe is structured. But we still don’t know what it is made of.

A new study by Franciolini, Ijaz, and Peloso suggests a surprising answer. Dark matter might not be made of unknown particles at all. Instead, it could be made of tiny black holes formed in the early universe, called primordial black holes (PBHs).

This idea is not completely new, but this study improves earlier work using better methods and more realistic calculations. Let’s break it down.

The Early Universe and Inflation

Right after the Big Bang, the universe went through a phase called inflation. During this time, space expanded extremely fast—much faster than it is expanding today.

We have strong evidence for inflation from observations like the Cosmic Microwave Background (CMB), which is the leftover light from the early universe. However, these observations only tell us about the early part of inflation.

What happened later during inflation is still unclear. To study this, scientists look at small-scale effects, such as:

  • Tiny density variations in matter

  • Gravitational waves (ripples in space)

  • Formation of primordial black holes

These small effects act like clues, helping us understand the hidden part of cosmic history.

What Are Primordial Black Holes?

Primordial black holes are very different from the black holes we usually hear about.

Normal black holes form when massive stars collapse. But PBHs form much earlier, directly from dense regions in the young universe.

If some regions became extremely dense, gravity could cause them to collapse into black holes. These black holes could be very small—some with masses similar to asteroids.

Interestingly, scientists have found that black holes in this asteroid-mass range could still exist today and are not ruled out by observations. This makes them strong candidates for dark matter.

How Are These Black Holes Created?

To understand how PBHs form, scientists study models of inflation. One interesting model is called axion inflation.

In this model:

  • A special field called the axion drives inflation

  • This axion interacts with another field called a gauge field (similar to the electromagnetic field)

This interaction creates a powerful effect. As the axion changes over time, it boosts or amplifies the gauge field.

This amplification depends on a parameter called xi (ξ). As inflation continues, ξ increases, making the effect stronger.

Because of this:

  • The gauge field becomes very strong

  • It creates large density fluctuations

  • Some regions become dense enough to form black holes

The Problem with Older Calculations

Earlier studies tried to calculate this process using simplified methods. One common assumption was that the gauge field reacts instantly to changes in the axion field.

This is called local backreaction.

But this assumption is not accurate.

In reality, the system has a memory effect. This means:

  • The behavior of the gauge field depends on its past history

  • Growth does not happen instantly

  • The system evolves over time in a more complex way

Ignoring this leads to errors, especially when the effects become strong.

A Better Method: Homogeneous Backreaction

To solve this problem, the new study uses a better method called homogeneous backreaction.

Instead of using simple formulas, the researchers:

  • Use computers to calculate how the gauge field evolves over time

  • Track how energy is distributed in the system

  • Make sure their method stays within a valid range

This approach is more realistic and gives more accurate results.

They also check something important:

  • The gradient energy (energy from spatial changes)

  • The kinetic energy (energy from motion of the field)

As long as gradient energy stays much smaller, their method is reliable. In this study, it remained safely low.

Why Statistics Matter

Another key part of the study is understanding the statistics of density fluctuations.

Not all fluctuations are simple or evenly distributed. Some can have more extreme values than others.

This matters because:

  • Only the extreme fluctuations can form black holes

  • Small changes in statistics can lead to huge differences in results

The researchers considered two possibilities:

  1. Gaussian distribution (normal bell curve)

  2. Chi-squared (χ²) distribution (more extreme values)

The real situation might lie somewhere between these two. Since we don’t know for sure, studying both helps estimate uncertainty.

Improved Black Hole Calculations

The study also improves how scientists calculate black hole formation.

They used more advanced methods that:

  • Consider realistic shapes of dense regions

  • Include effects from Einstein’s theory of gravity

  • Avoid errors from large-scale effects

This makes their predictions much more reliable than before.

Main Result: Black Holes Can Explain Dark Matter

The most exciting result is this:

Primordial black holes could make up all of the dark matter in the universe.

This is possible in the asteroid-mass range and works within a controlled and realistic setup.

Even better:

  • The method remains valid throughout the calculations

  • The system does not break down or become unstable

This gives strong confidence in the results.

A Big Bonus: Gravitational Waves

This process doesn’t just create black holes—it also produces gravitational waves.

These are ripples in space-time that travel across the universe.

The study predicts a stochastic gravitational wave background, which is like a random background noise of gravitational waves.

Here’s why this is exciting:

  • These waves could be detected by a future mission called LISA (Laser Interferometer Space Antenna)

  • The signal strength depends on the type of statistical distribution

For example:

  • Gaussian case → stronger signal

  • χ² case → weaker signal

This means future observations could actually tell us which model is correct.

Why This Study Is Important

This research is important for several reasons:

  1. It uses more accurate and realistic methods

  2. It considers uncertainties properly

  3. It provides clear predictions that can be tested

  4. It offers a new explanation for dark matter

Instead of searching for unknown particles, we might already know what dark matter is—it could be black holes formed long ago.

Final Thoughts

The idea that dark matter is made of primordial black holes is becoming more serious and scientifically testable.

This new study shows that:

  • The idea works under realistic conditions

  • The predictions are strong and reliable

  • Future experiments can confirm or reject it

If missions like LISA detect the predicted gravitational waves, we could finally solve the mystery of dark matter.

And if that happens, it would not just change our understanding of dark matter—it would also reveal new secrets about the very beginning of the universe.

Reference: Gabriele Franciolini, Nadir Ijaz, Marco Peloso, "Primordial black hole dark matter from axion inflation", Arxiv, 2026. https://arxiv.org/abs/2604.27496


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