For many years, scientists have been fascinated by one of the biggest mysteries in the universe: how can we truly identify the most extreme objects in space? Black holes are famous for their powerful gravity, where nothing — not even light — can escape. But what if some objects that look like black holes are actually something completely different?
A new theoretical study has explored a strange possibility: a wormhole could sometimes appear exactly like a black hole depending on where the observer is located. This means that the same cosmic object could be identified differently by different observers. One observer might see a wormhole, while another might believe they are looking at a black hole.
The study focuses on a special type of theoretical wormhole called the Harko–Kovács–Lobo wormhole (HKLWH). Researchers Karimov, Izmailov, and Nandi investigated how this wormhole behaves, how it affects light, and why its appearance could change depending on the observer.
What Are Wormholes?
A wormhole is a hypothetical tunnel that connects two different regions of spacetime. Imagine folding a piece of paper and creating a shortcut between two distant points. A wormhole is a similar idea, but instead of paper, it involves the structure of the universe itself.
The idea of wormholes first appeared in the work of Albert Einstein and Nathan Rosen in 1935. Their famous concept, known as the Einstein–Rosen bridge, suggested that spacetime could contain connections between different regions.
Later, scientists developed more detailed wormhole models. However, keeping a wormhole open requires unusual conditions because normal matter cannot support such a structure. According to physics, wormholes need a type of matter or energy that violates the normal rules known as the null energy condition.
The HKL wormhole model is based on two important factors:
The throat size (r₀): This is the narrowest point of the wormhole, the “bridge” connecting two sides of spacetime.
The deviation parameter (γ): This controls how the wormhole differs from a black hole-like object.
The value of γ lies between 0 and 1. A non-zero γ helps create the special conditions needed for the wormhole to exist.
Understanding the Hidden Forces Around a Wormhole
The researchers first studied the energy and gravitational properties of the HKL wormhole.
Gravity around extreme objects behaves in unusual ways. Near a black hole, for example, gravity can stretch objects because the gravitational pull on one side can be much stronger than the other. This effect is called tidal force.
The study showed that the HKL wormhole creates tidal effects that match what scientists expect from a wormhole structure.
The value of γ influences these effects. Changing γ changes the way gravity behaves around the wormhole, affecting how light and objects move near it.
The researchers also found that the gravitational energy of the wormhole could become negative in certain regions. This does not mean the wormhole has “negative energy” in a simple sense, but it represents the unusual gravitational behavior required for such a structure.
The Strange Connection Between Light and Cosmic Identity
The most fascinating part of this research involves light.
Scientists usually study distant objects by observing how light behaves around them. A black hole and a wormhole may produce different effects on light, but the researchers explored a new idea based on the work of Frank Tangherlini.
Tangherlini proposed that instead of thinking of photon behavior as completely predictable, we can describe it using probabilities.
In this approach, photons can have two possible outcomes:
They can be reflected back.
They can pass through.
These possibilities are described using two values:
Reflection (R) — the chance that light bounces back.
Transmission (T) — the chance that light passes through.
If all photons are reflected:
R = 1, T = 0
the object would behave like a black hole because light cannot escape.
If all photons pass through:
R = 0, T = 1
the object would behave like a wormhole because light can travel through its throat.
But the surprising situation happens when both reflection and transmission occur.
A Wormhole That Looks Like a Black Hole
According to the study, the HKL wormhole may not have one fixed appearance for everyone.
A nearby observer close to the wormhole could see photons passing through the structure. From this viewpoint, the object would likely be identified as a wormhole.
However, an observer far away might detect more reflected photons. For that observer, the object could appear similar to a black hole.
This creates a strange possibility:
The object itself does not change — only the observer’s interpretation changes.
The researchers describe this as a probabilistic identification of the object. The wormhole geometry influences how photons behave, and the observer’s location affects the final result.
Even when γ is not zero — meaning the object is technically a wormhole — there is still a possibility that it could be observed as a black hole.
Why This Discovery Is Important
This research changes the way scientists think about identifying cosmic objects.
Usually, scientists ask:
“What is this object?”
Is it a black hole?
Is it a wormhole?
But this study introduces another possibility:
“How would different observers identify the same object?”
This does not mean every black hole could secretly be a wormhole. Instead, it suggests that extreme gravitational objects may be more complicated than they appear.
Future observations using advanced telescopes, gravitational wave detectors, and studies of light around massive objects could help scientists understand whether mysterious objects in space are truly black holes or something even more exotic.
The universe may contain objects that hide their true nature. A cosmic structure that looks like a black hole from far away could, under the right conditions, reveal itself as a gateway through spacetime.
The biggest lesson from this research is simple:
In the universe, what we see may depend not only on what exists — but also on how and where we observe it.
Reference: R. Kh. Karimov, R. N. Izmailov, K. K. Nandi, "On a Class of Harko-Kovacs-Lobo Wormholes", Universe 8, 540 (2022). https://doi.org/10.3390/universe8100540
Technical Terms
1. Wormhole
A wormhole is a theoretical tunnel or shortcut through spacetime that could connect two different places in the universe. Imagine folding a paper so two distant points touch each other and creating a tunnel between them — that is the basic idea of a wormhole.
Scientists have not yet discovered a real wormhole, but they study them using physics equations.
2. Black Hole
A black hole is an extremely dense object where gravity is so strong that nothing can escape, not even light.
It forms when a massive star collapses under its own gravity. The boundary around a black hole, beyond which nothing can return, is called the event horizon.
3. Harko–Kovács–Lobo Wormhole (HKLWH)
This is a mathematical model of a possible wormhole developed by scientists Harko, Kovács, and Lobo.
It describes how a wormhole might behave, how gravity works around it, and how light might travel near it.
It is not a confirmed object in space — it is a theoretical model used to study possibilities.
4. Wormhole Throat (r₀)
The throat is the narrowest part of a wormhole.
Think of a tunnel: the entrance and exit may be wide, but the middle connecting point is the throat. In a wormhole, this is the region where two parts of spacetime are connected.
The value r₀ represents the size of this throat.
5. Deviation Parameter (γ)
The parameter γ tells scientists how different the wormhole is from a normal black hole-like structure.
A higher or lower γ changes the behavior of gravity, light, and forces around the wormhole.
In the HKL wormhole model:
0 < γ < 1
means the wormhole has the special properties needed to remain open.
6. Null Energy Condition (NEC)
The null energy condition is a rule in physics that describes how normal matter behaves under gravity.
It basically says:
“Energy should always have normal positive behavior when measured by light-like paths.”
Wormholes require a violation of this condition because ordinary matter cannot keep a wormhole open. Scientists call this requirement exotic matter or unusual energy conditions.
7. Exotic Matter
Exotic matter is a hypothetical type of matter with unusual properties, especially negative energy behavior.
Scientists think something like this may be needed to prevent a wormhole from collapsing.
It does not mean “alien material”; it simply means matter with properties different from normal matter.
8. Tidal Forces
Tidal forces are differences in gravitational pull across an object.
For example, near a black hole, gravity pulling your feet can be much stronger than gravity pulling your head. This difference stretches objects.
This is why scientists talk about “spaghettification” near black holes.
9. Spacetime
Spacetime is the combination of space and time into one four-dimensional structure.
According to Einstein’s theory of relativity, massive objects like stars and black holes bend spacetime, and this bending creates gravity.
10. Gravitational Energy
Gravitational energy describes the energy associated with gravity.
In the HKL wormhole study, researchers found unusual gravitational energy behavior, including regions where the calculated gravitational energy becomes negative.
This represents the strange gravitational environment needed for wormhole physics.
11. Lorentz-Boosted Frame
A Lorentz-boosted frame means observing something while moving at a high speed compared with another observer.
Einstein’s relativity shows that measurements of space, time, and forces can change depending on the observer’s motion.
12. Photon
A photon is a tiny packet of light energy.
All light — from sunlight to laser beams — is made of photons.
In this research, photons are used as “messengers” to test whether the object behaves like a black hole or wormhole.
13. Effective Optical Medium
Normally, an optical medium is something like glass or water that changes how light travels.
In this study, gravity itself is treated like an “optical medium” because strong gravity can bend and change the path of light.
14. Fresnel Coefficients (R and T)
Fresnel coefficients describe what happens when light reaches a boundary.
There are two main possibilities:
R (Reflection):
The amount of light that bounces back.
T (Transmission):
The amount of light that passes through.
In the study:
R = 1, T = 0 → behaves like a black hole (light cannot escape)
R = 0, T = 1 → behaves like a wormhole (light passes through)
15. Tangherlini’s Pre-Quantum Statistical Approach
Tangherlini proposed a way of describing photon behavior using probability instead of only fixed outcomes.
Instead of saying:
“Every photon will definitely do this.”
The idea says:
“There is a probability that photons will reflect or pass through.”
This helps scientists describe uncertain interactions without directly using full quantum mechanics.
16. Effective Refractive Index (n)
The refractive index tells how much light slows down or changes direction when moving through a material.
For example, light bends when it enters water because water has a different refractive index than air.
In this study, gravity creates a similar effect, changing how light moves around the wormhole.
17. Probabilistic Identification
This means identifying something based on probability rather than a single definite result.
In this research, the same wormhole may have a probability of appearing as:
a wormhole to one observer
a black hole to another observer
depending on where they are located.
18. Einstein’s General Relativity
General relativity is Einstein’s theory explaining gravity.
It says gravity is not simply a pulling force; instead, massive objects bend spacetime, and objects move through this curved spacetime.
This theory predicts black holes and allows scientists to study possible wormholes.
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