I wouldn't call it a technolgy, but everyone has heard of such things. They are called black holes and you don't want to be within a million miles of one because they tear the atoms in your body apart while you fall into the everlasting VOID of nothingness inside never to escape again - which is why it is called a blackhole.
And per the equivalence principle if space-time is bent to the degree you describe then the local properties are identical to a very very strong black hole, meaning it is a black hole and the physicist who invtented the technology is now locked inside the VOID he created.
Others have a different take. And, they assert that it IS a technology. And from where I sit, they know far far more about such topics than you seem to.