( ( According ( to Chopra ) ) ( , ( ( quantum mechanics ) ( ( teaches ( that ( ( in ( the ( subatomic world ) ) ) ( there ( are ( ( no ( objects ( , ( only ( oscillating possibilities ) ) ) ) ) ( that ( simultaneously exist ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (VBG According) (PP (TO to) (NP (NNP Chopra)))) (, ,) (NP (NN quantum) (NNS mechanics)) (VP (VBZ teaches) (SBAR (IN that) (S (PP (IN in) (NP (DT the) (JJ subatomic) (NN world))) (NP (EX there)) (VP (VBP are) (NP (NP (DT no) (NNS objects) (, ,) (RB only) (JJ oscillating) (NNS possibilities)) (SBAR (WHNP (WDT that)) (S (ADVP (RB simultaneously)) (VP (VBP exist))))))))) (. .)))
According to Chopra, quantum  mechanics teaches that in the subatomic world there are no objects, only oscillating possibilities that simultaneously exist.
(ROOT (S (NP (NP (DT The) (JJ specialized) (NN study)) (PP (IN of) (NP (NP (DT the) (NN motion)) (PP (IN of) (NP (NP (NNS objects)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (ADJP (JJ atomic/subatomic) (PP (IN in) (NP (NN size)))))))))))) (VP (VBZ is) (VP (VBN called) (NP (NN quantum) (NNS mechanics)))) (. .)))
The specialized study of the motion of objects that are atomic/subatomic in size is called quantum mechanics.