Penn State Team Extends 50-Year Hawking Black Hole Laws to Dynamic Horizons
Updated
Updated · ScienceDaily · Jul 16
Penn State Team Extends 50-Year Hawking Black Hole Laws to Dynamic Horizons
3 articles · Updated · ScienceDaily · Jul 16
Summary
Physical Review Letters published a Penn State framework that applies black hole thermodynamics to changing black holes, not just idealized equilibrium states.
The team replaces the event horizon with a dynamical horizon, a moment-by-moment boundary that avoids relying on future events to define a black hole's physical entropy.
Abhay Ashtekar's group says the new entropy measure ties more closely to a black hole's spin and energy, allowing the first and second thermodynamic laws to hold far from equilibrium.
That could sharpen models of black hole growth, mergers and evaporation, including gravitational-wave events observed by the LIGO-Virgo-KAGRA collaboration.
The work revises a 1970s Hawking framework that had guided the field for 50 years but could not fully describe real black holes as they evolve.
Is Stephen Hawking's famous black hole theory about to be replaced?
How does a new theory fix the paradox in Hawking's original work?
Black Hole Thermodynamics for Dynamic Systems: The 2026 Penn State Revolution in Entropy and Mergers
Overview
In July 2026, physicists from Penn State, including Abhay Ashtekar, made a major breakthrough by extending black hole thermodynamics beyond static, equilibrium states to dynamic, evolving systems. Their research introduced the concept of dynamical horizon segments, allowing the first law of black hole mechanics to describe real, finite changes during events like black hole mergers—something the traditional framework could not do. This new approach, grounded in Einstein’s theory of general relativity, provides a more accurate and practical way to understand how black holes change over time, marking a significant step forward in theoretical physics.