Researchers at the Advanced Science Research Center at the City University of New York Graduate Center (CUNY-ASRC) have made a significant breakthrough by validating a theory put forth by Sir Roger Penrose over five decades ago. This theory posits that energy can be extracted from a rapidly spinning (Kerr) black hole by inserting an object into the ergosphere, the region just beyond its event horizon. The object, upon entering this region, would be accelerated and ejected, carrying away more energy than it initially possessed.
Building on Penrose’s work, Soviet physicist Yakov Zeldovich expanded this concept in 1971, suggesting that waves interacting with a rapidly spinning object could not only extract energy but also amplify it. In a recent publication in Nature, the CUNY-ASRC team introduced a novel approach for amplifying waves through their interaction with rotating bodies.
Experimental Setup
The researchers utilized a radio-frequency device designed to simulate ultrafast rotation, achieving speeds far beyond mechanical limitations. This device comprises a ring-shaped network of electronic resonators, whose properties were modulated in a timed sequence to create a traveling pattern around the ring. Although the device remained stationary, the electromagnetic waves produced a synthetic motion that mimicked an object rotating at ultra-fast speeds.
Key Findings
According to Andrea Alù, Distinguished and Einstein Professor of Physics at CUNY and director of the Photonics Initiative, their method enables a new form of wave-matter interaction. Waves with specific rotational properties can extract energy from this synthetic rotation, resulting in a form of broadband selective amplification. The lead author, Hadiseh Nasari, emphasized that the experiment successfully demonstrated the theoretical possibility of electromagnetic waves behaving as if they were interacting with an object rotating at ultrafast speeds.
Implications for Science and Technology
This experiment not only transitions theoretical concepts of extreme rotational dynamics into practical applications but also establishes a versatile platform for exploring various phenomena at the intersection of astrophysics, wave physics, and quantum science. The implications are vast, potentially advancing fundamental science and applications in communications, optics, and photonics.
Moreover, the ability to simulate motion faster than the speed of light provides researchers with a powerful tool for studying extreme physics in controlled environments. The team envisions that their findings could lead to technological adaptations in both classic and quantum optics, as well as wireless communications. Co-lead author Hady Moussa noted that their approach, which relies on engineered metamaterials, effectively reproduces the essential physics of the Penrose-Zel’dovich process.
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