According to research published in Physical Review Letters, the total surface area of a black hole’s event horizon cannot decrease, offering new empirical backing for a foundational physics concept originally proposed by Stephen Hawking. When two black holes collide and release energy through gravitational waves, the combined final surface area still expands beyond the sum of the initial areas.
How Advanced Detectors Measured Black Hole Area Expansion
Scientists estimated that the two colliding black holes possessed a combined surface area of approximately 240 mil km² before their merger. Following the collision and the subsequent release of gravitational waves, that total expanded to roughly 400 mil km² square kilometers, according to the study published on September 10.
This measurement achieved a statistical confidence level of 99,999%. The new findings successfully surpass a preliminary test conducted in 2021, which relied on data that researchers described as considerably noisier and less precise.
Did you know? Modern gravitational-wave detectors can spot changes in space-time smaller than one-tenth of a thousandth of the size of a proton, enabling measurements previously thought impossible.
Testing Fundamental Physics Through Space-Time Precision
The breakthrough was made possible by technical advancements in the Laser Interferometer Gravitational-Wave Observatory (LIGO) over the past decade. These upgrades allow for exceptionally sensitive measurements of variations in space-time.
Katerina Chatziioannou, a professor of physics at Caltech and a member of the research team, stated that the gravitational-wave signal can now be heard with remarkable clarity.
Frequently Asked Questions
What is Hawking’s area theorem for black holes?
First proposed by Stephen Hawking, the theorem states that the total surface area of a black hole’s event horizon can never decrease over time, even when two black holes merge.
How much did the black hole surface area increase during the observed merger?
According to the study published in Physical Review Letters, the combined surface area grew from approximately 240 mil km² before the collision to about 400 mil km² afterward.
What technology enabled this precise measurement?
Upgrades to the LIGO detectors over the past decade enabled extremely sensitive recordings of space-time alterations, registering variations smaller than a fraction of a proton’s size.
Want to stay updated on the latest breakthroughs in astrophysics and gravitational-wave astronomy? Subscribe to our weekly newsletter for more deep dives into space research, or explore our physics news archive for related stories.
Worth a look