RT Journal T1 Optimal Decay for the N-Dimensional Incompressible Oldroyd-B Model Without Damping Mechanism A1 Qianqian Xie,Xiaoping Zhai,Boqing Dong PB Acta mathematica scientia,Series A FD 2021-06-26 YR 2021 JF Acta mathematica scientia, Series A JO Acta mathematica scientia,Series A VO 41 IS 3 SP 762 DO K1 ;Oldroyd-B model;Time decay estimates;Besov space LK {http://121.43.60.238/sxwlxbA/EN/article/article_16424.shtml}