Collapsing stars could give rise to mini-universes and open up a new path to gravastars

The Boundaries of Black Holes and the Singularity Puzzle

The radiation emitted by stars is fueled by the fusion of atoms within them, a process that releases a massive amount of energy. However, when a particularly massive star exhausts its nuclear fuel, the radiation pressure can no longer provide sufficient counterforce to gravity. The star then collapses under its own weight until only a single point remains: the singularity.

Although the formation of a black hole seems plausible, these cosmic objects continue to pose major challenges to science, as reported in a press release by Markus Bernards for Goethe University in Frankfurt am Main. Scientists struggle to understand how a mass equivalent to ten billion solar masses can be concentrated into a single tiny point. At this precise stage of the collapse, spacetime is curved to infinity and the fundamental laws of physics break down, making any prediction impossible.

The mystery deepens because black holes conceal all information from external observation. Anything that crosses the event horizon—including light—disappears irrevocably. This theoretical impasse is driving researchers to explore new avenues to explain the ultimate fate of ultra-compressed matter.

The Gravastar Alternative and the Role of Dark Energy

Given these theoretical difficulties, it is conceivable that black holes are actually entirely different entities, much like ultra-compact stars. These cosmic objects, invisible due to their intense gravity, are referred to by the scientific community as gravastars.

Unlike classical black holes, these hypothetical celestial bodies are thought to possess a unique internal structure. In addition to the ordinary matter present in their outer layers, their cores would be filled with dark energy. This mysterious component would exert an outward pressure capable of stabilizing the star’s mass—a mass that would otherwise tend to collapse in on itself.

Physicists find the concept of gravastars easier to accept because they lack singularities and event horizons, while remaining nearly as massive and compact as true black holes. However, the specific mechanism allowing for the formation of such objects during the collapse of ordinary matter remained a blind spot in cosmology and had been the subject of debate for twenty-five years.

A New Mathematical Solution to Einstein’s Equations

A major breakthrough has now dispelled this long-standing uncertainty thanks to the work of theoretical physicists Daniel Jampolski and Professor Luciano Rezzolla. For the very first time, these researchers have presented a dynamic solution to Albert Einstein’s field equations of general relativity, describing a stellar collapse process capable of generating a gravastar.

According to the study detailed in 2026 in the scientific journal Physical Review D, the solution revealed that this collapse could trigger the creation of a mini-universe within the collapsing matter itself. This remarkable phenomenon would not be very different from the Big Bang from which our own universe emerged. Like our own cosmos, the expansion of this miniature universe would be driven by the presence of dark energy.

In this way, the rapid expansion of this new universe directly counteracts gravitational forces and manages to halt the star’s collapse before a black hole can fully form. In this specific process, a lasting equilibrium is established between the expanding mini-universe and the collapsing matter. It is this delicate state of equilibrium that gives rise to a stable gravastar.

Extreme compression: the breeding ground for a new physics

The genesis of this discovery is rooted in a tradition of academic excellence. Daniel Jampolski identified this elegant mathematical solution during his master’s thesis, a research project conducted under the direct supervision of Professor Rezzolla at Goethe University.

The researcher pinpoints the timeline of this cosmic process with precision. “The Big Bang of the emerging universe can occur once the star has already collapsed nearly to the point of becoming a black hole,” explains the young physicist, describing the critical phase of the gravastar’s birth.

The behavior of matter when subjected to such pressure opens the door to the exploration of new physics. Jampolski elaborates on this innovative hypothesis: “It is easier to imagine that the Big Bang occurs only at a very late stage, when matter has already been compressed to an extreme degree, thereby giving rise to new effects.”

Maintaining an Impartial Approach to Cosmic Exploration

Although this theory offers a highly sophisticated alternative, the study’s authors emphasize the importance of not immediately dismissing well-established models. Luciano Rezzolla, a professor of theoretical astrophysics, points out that academic rigor requires cultivating both caution and intellectual boldness in the face of the cosmic immensity.

The professor precisely contextualizes the philosophical and scientific scope of their research: “Seeking alternatives to black holes should not imply skepticism toward black holes, which still represent the most natural and simplest solution to the fate of gravitational collapse. However, as scientists in general—and as theoretical physicists in particular—it is essential to maintain an impartial approach toward what we do not know and thus to explore both accepted wisdom and more exotic interpretations. History teaches us that it is not unusual for the latter to become the former.”

All technical details of this work, titled “Formation of gravastars,” are rigorously documented. The study is publicly available under its official DOI (10.1103/c6lw-nx7k) in Physical Review D, as well as on the physics community’s preprint platform, arXiv, under the DOI: 10.48550/arxiv.2509.15302.

Source: phys.org

Collapsing stars could give rise to mini-universes and open up a new path to gravastars