Collapsing stars could spawn mini-universes, offering new path to gravastars
Theoretical physicists Daniel Jampolski and Professor Luciano Rezzolla of Goethe University Frankfurt have proposed that collapsing stars may form “gravastars” rather than black holes. According to their research published in Physical Review D, a mini-universe driven by dark energy emerges during the collapse, creating an outward pressure that prevents the formation of a singularity.
How do gravastars form during stellar collapse?
A star collapses when it runs out of nuclear fuel and radiation pressure can no longer fight gravity. Traditionally, this leads to a black hole. However, Jampolski and Rezzolla’s new solution to Albert Einstein’s general relativity field equations suggests a different path.
The research indicates that as matter compresses to an extreme degree, it can trigger the creation of a mini-universe. This internal expansion is driven by dark energy, similar to the Big Bang that started our own universe. This expansion pushes outward, counteracting gravitational forces and halting the collapse before a black hole forms.
This process establishes an equilibrium between the collapsing outer matter and the expanding interior. According to the researchers, this balance results in a stable gravastar.
Why are gravastars different from black holes?
The primary difference lies in what happens at the center. Black holes contain a singularity—a single point where 10 billion solar masses could theoretically concentrate, causing spacetime to curve infinitely. According to the provided study, this is where the known laws of physics break down.
Gravastars avoid this breakdown. They don’t have a singularity or an event horizon. Because they lack an event horizon, they don’t “trap” information or light in the same irretrievable way black holes do. Instead, they’re filled with dark energy that stabilizes the mass.
| Feature | Black Hole | Gravastar |
|---|---|---|
| Center | Singularity (Infinite Density) | Expanding Mini-Universe |
| Boundary | Event Horizon | Ultra-compact shell |
| Internal Force | Gravity (Collapse) | Dark Energy (Expansion) |
What does this mean for the future of astrophysics?
This discovery addresses a 25-year-old debate about how gravastars could actually form from ordinary matter. Jampolski discovered the solution during his master’s thesis. He explains that the “Big Bang” of this emerging universe happens only after the star has already collapsed nearly to the point of becoming a black hole.
Professor Rezzolla notes that while black holes remain the simplest solution to gravitational collapse, it’s essential for physicists to explore exotic interpretations. He argues that history shows exotic theories often become the accepted wisdom.
If gravastars are common, it changes how we view the “dark” objects in our galaxy. It suggests that some of the most massive objects in the universe might actually be gateways to mini-universes rather than bottomless pits of no return.
Frequently Asked Questions
What is a gravastar?
A gravastar is a theoretical ultra-compact star stabilized by an interior of dark energy, preventing it from collapsing into a singularity.
Do black holes still exist?
Yes. Professor Rezzolla states that black holes are still the most natural and simplest solution to gravitational collapse, but gravastars offer a viable alternative.
Who published this research?
The findings were published in the journal Physical Review D by Daniel Jampolski and Professor Luciano Rezzolla of Goethe University Frankfurt.
Can we see gravastars?
They’re difficult to observe because their intense gravity makes them look almost identical to black holes from the outside.
For more on the intersection of general relativity and quantum mechanics, check out our guide on spacetime curvature or read the full paper at Phys.org.