The Universe: Don't Come Any Closer!

"But there's another way. Maybe we can find a shortcut."

On deck.

At Yang Zhenning's words, Huang Kun instinctively gripped the edge of the table.

"What way? Does it have something to do with a donkey?"

Yang Zhenning had been about to answer, but the word "donkey" made him pause in surprise. He stopped mid-sentence.

"A donkey? What does that have to do with a donkey?"

Only then did Huang Kun realize he'd apparently reacted without thinking. He quickly gave an awkward cough.

"Oh, nothing, nothing. I just got my thoughts crossed. Old Yang, go on, go on."

Yang Zhenning gave Huang Kun a strange look, wondering if his old classmate had been kicked by a donkey before boarding the ship.

Then he quickly took a deep breath and brought both his attention and the conversation back to where they'd been.

"Old Huang, the method I'm talking about is unfamiliar to you—or perhaps to the country as a whole."

"Actually, if Old Zhao and the others' paper hadn't given me some inspiration, I might never have thought of this approach myself."

After preparing Huang Kun for what was coming,

Yang Zhenning paused, then continued:

"Old Huang, how much do you know about AdS spacetime?"

"AdS spacetime?"

Huang Kun raised his eyebrows slightly and quickly replied:

"Old Yang, do you mean Anti-de Sitter spacetime?"

Yang Zhenning nodded lightly.

As mentioned earlier,

the most complete theory currently available for describing gravity was general relativity. The framework was called a "theory," but its theoretical core was actually a system of equations.

Namely, the Einstein field equation.

This was a highly complex system of nonlinear partial differential equations. The unknown functions to be solved for included both the metric components gμν and the components of the energy-momentum tensor Tμν.

As everyone knew,

the flat