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Do We Need a New Theory of Gravity?
...when we have to open eyes for something new. But we know something is not quite right in Einstein’s theory of general relativity. When it comes to black holes, for...
If the Universe Is a Hologram, This Long-Forgotten Math Could Decode It
...fabric can’t be the whole story. Dying stars puncture it, creating intensely warped regions called black holes where the equations of general relativity break down. And even in calmer parts...
Mass and Angular Momentum, Left Ambiguous by Einstein, Get Defined
...two black holes that are in the process of merging, and they want to determine the mass of each individual black hole prior to the merger, as opposed to that...
New Math Proves That a Special Kind of Space-Time Is Unstable
...black hole will form. Here’s the proof of instability: Moschidis showed that when he adds even a minuscule amount of matter to an AdS space-time, a black hole (or black...
How Gravity Is a Double Copy of Other Forces
...trick in gravity’s repertoire. Black holes famously warp space-time intensely enough to trap light, and spinning black holes drag the warped space-time fabric around with them. The equations are super...
Is Gravity Just Entropy Rising? Long-Shot Idea Gets Another Look.
...Entropy quantifies this growth of disorder. Indeed, when physicists used quantum mechanics to study what happens in the distorted space-time around a black hole, they find that black holes give...
Physicists Create a Holographic Wormhole Using a Quantum Computer
...two black holes is created by EPR-like correlations between the microstates of the two black holes,” and that the duality might be more general than that: “It is very tempting...
Physicists Uncover Geometric ‘Theory Space’
...of space-time in our own universe, and yet gravity there works in much the same way as it does here. Both geometries, for instance, give rise to black holes —...
Physicists Mourn Joe Polchinski, Developer of Deep Ideas and Paradoxes
...share of lasting developments without following trends or getting into ruts. In important recent work, Polchinski reinvigorated an old paradox about black holes. Quantum fluctuations near the horizons of black...