Rotating Wormhole Without Exotic Matter ⚡ экспресс
In Einstein's general relativity, wormholes usually require exotic matter that violates energy conditions. However, in f(R,T)-gravity, where gravity is coupled to the energy and momentum of matter, rotating wormholes can be built from ordinary anisotropic fluid. Remarkably, such solutions satisfy the null and strong energy conditions, meaning no exotic matter is needed. The effects of rotation are also explored: frame-dragging of spacetime (like a vortex), particle motion, and gravitational lensing, offering possible observational clues. It's like an arch that stays up without unnatural supports.
A wormhole is a tunnel in curved spacetime that shortens the path between distant regions. In Einstein's theory, such a tunnel collapses instantly: to keep it open, you need a 'strut' of negative-energy matter (antigravity). No such matter has been found, so wormholes were considered fantasy.
In a new study, scientists revised the laws of gravity: in their model, rotation itself pries the walls apart. Think of a whirlpool in a river — the swirling flow creates a funnel that stays open as long as it spins. Calculations show that nothing exotic is needed — ordinary matter does the job. The rotation also drags spacetime along, making light loop around the tunnel.
Most surprising: such a wormhole could act as a time machine. Spacetime around it twists so much that a traveler emerges from the other end before they even entered. For an Earth observer, the object would cast a double shadow with a bright ring, unlike black holes or neutron stars. Future telescopes could spot such a signature.
🎯 The name was coined by physicist [scientist:John Archibald Wheeler]John Wheeler[/scientist]: he compared spacetime to an apple, with a worm chewing a shortcut through its interior instead of crawling along the skin.
🎬 Like in 'Interstellar': a wormhole near Saturn sent heroes to other worlds. Now physicists say such a thing might work without mysterious antigravity — just rotation.