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các nhà vật lý lý thuyết tính toán cách quay về quá khứ qua... ring wormhole

recently, a team of theoretical physicists (vật lý lý thuyết) published (xuất bản) a paper on exactly what laws of physics (định luật vật lý) could be stretched just far enough to make it happen.

The key to the whole idea is wormholes—specifically, a type of wormhole called a ring wormhole. Now, wormholes are already entirely theoretical, so this discussion (tranh luận) is going to get weird (lạ lùng). And ring wormholes get even weirder than “normal” wormholes.

Your average, run-of-the-mill wormholes, as we tend to think of them, are basically holes punched in the fabric of spacetime (kết cấu không gian, thời gian) by the immense gravity (trọng lực) of black holes. The gravity well at the center of these objects is so intense that scientists have often theorized they could act as tunnels to another universe, or another time.

But ring wormholes aren’t black-hole dependent. Instead, the (again, highly theoretical) objects are caused by circles of mass (khối) that have negative energy (năng lượng âm), something only made possible by the strange effects of the quantum realm (thế giới lượng tử). This circle of negative energy would basically create a portal to another universe without the need to go through a black hole tunnel.

“You could go through and not even notice that you went to another universe,” Andrei Zelnikov, one of the authors on the recent paper, told New Scientist.

The paper—published in the journal Physical Review D by Zelnikov and his team—puts forth calculations that claim a ring wormhole could not only act as a universe-to-universe teleport (dịch chuyển), but as a time machine (máy thời gian).

According to the heavy-duty number-crunching (xử lý số liệu), the ring wormholes could generate something called a “closed timelike curve” if one “mouth” of the wormhole near a bunch of mass and the other “mouth” was far away from any significant amount of mass. If the conditions are right around the mouths of the wormhole, the closed timelike curves generated are then able to turn a portal into a time machine.