what new authors are proposeing the best or most radical concepts of science.im only familiar with old school.like harlan ellison

Welcome to sciforums!
(yay, that teh first time Ive said that.)

Umm, I cant think of many just now. Gregory Benford is worth a look at. Robert reed and Adam Roberts are quite good. Is it hard scifi your after? Harlan Ellison is going back a long way. Have you read any Arthur C Clarke?