A team of scientists has proposed a revolutionary idea to explain one of the greatest contradictions in our understanding of the universe: the discrepancy in measuring its rate of expansion, known as the Hubble Tension. According to a study published in the journal Monthly Notices of the Royal Astro
They expand if they have matter falling into them.
What’s the “they” that you mean? The event horizon, the transition point where light can’t escape?
That doesn’t sound like what they were saying. The actual “hole” supposedly remains infinitely small. And the event horizon radius would expand at a pretty slow rate as matter fell into the black hole. Exponentially smaller as it gains mass.
So I’m still trying to understand in what case a black hole ever “expands rapidly”.