Summary (tl;dr)

New computer simulations by Russian physicists suggest that colliding wormholes could produce distinct, short bursts of gravitational waves, offering a potential "fingerprint" to help astronomers identify these hypothetical cosmic tunnels if they exist.

Essential Background

Gravitational waves are ripples in the fabric of spacetime, much like waves in a pond, caused by incredibly energetic cosmic events such as the collision of massive black holes. These waves were first directly detected in 2015, opening a new window into observing the universe. Wormholes, on the other hand, are theoretical "shortcuts" or tunnels through spacetime, a concept arising from Albert Einstein's theory of general relativity, though their existence has not yet been confirmed. Most gravitational wave detections to date have been attributed to merging black holes, which produce a characteristic signal known as a "chirp" that increases in frequency and amplitude over time.

The Full Story

The keywords are trending due to recent research by Russian physicists Nikita Shirokov and Ilya Nachevsky, who conducted detailed computer simulations of what might occur when two "Ellis-Bronnikov wormholes"—a specific theoretical type of wormhole—collide. Their simulations revealed that such interactions could generate "short, sharp bursts" of gravitational waves, a distinct "gravitational bark," which would differ significantly from the "chirp" signals produced by colliding black holes. This study, currently a preprint and awaiting peer review, also explored various complex outcomes of these collisions, including scenarios where a common "apparent horizon" formed around the wormholes, which in some cases surprisingly shrank. This shrinking behavior challenges aspects of Stephen Hawking's theorem regarding the non-decreasing area of black hole event horizons.

Why It Matters

This research is significant because it provides astronomers with a novel signature to search for within the vast amounts of gravitational wave data collected by observatories worldwide. By understanding the unique gravitational wave patterns that hypothetical wormhole collisions might produce, scientists gain a new tool to potentially distinguish these exotic objects from more familiar black hole mergers. If such distinct signals are ever detected, it could offer the first observational evidence for the existence of wormholes, revolutionizing our understanding of spacetime, gravity, and the extreme physics of the universe.

Geographic Location

• Moscow Institute of Physics and Technology, Moscow, Moscow Oblast, Russia (research affiliation of Nikita M. Shirokov)
• Higher School of Economics, Moscow, Moscow Oblast, Russia (research affiliation of Ilya Nachevsky)