One step closer to real warp drives?

The video explores the concept of warp drives, inspired by Star Trek, which theoretically allow faster-than-light travel without breaking physical laws. It discusses Einstein's theory of relativity and how space can be warped using gravity. Alcubierre's hypothesis proposed a warp bubble using mass, but required negative mass, which violates physics laws. Eric Lentz's 2021 study suggested using positive mass to create a similar effect, but challenges remain, including the need for massive amounts of mass and accelerating the warp bubble.

What is the significance of negative mass in the context of warp drives, and why is it problematic?

How did Eric Lentz's research in 2021 contribute to the concept of warp drives?