Its been quite a while since I read this, but some info is better than none! Its rather like "Rama" - a big asteroid appears over the earth in the near future. It was obviously made to be inhabited but seems empty. Various groups battle over it, and then they realise there's singularity at one end so that it goes on forver. There's some maths describing this but mainly it's about the two societies. (Ours and the one which made the asteroid)

While it was a great read, and grandly mind bending due to the spacetime bending, the math content is really minimal beyond advanced jargon that sounds cool. The idea that in curved spacetime a circle's circumference isn't a certain popular number times the radius - yes that idea is there, but really the novel is about Humankind's history and future in a very big way. The seemingly infinite space tunnel in the asteroid plays a role similar to the cosmic trip in Contact - a mechanism to connect faraway places, times. Still, readers who like a bit of technical math or physics jargon will enjoy its occasional appearances the way a fine diner enjoys parsley decorating a bowl of soup.