title: Exactification of the Poincaré asymptotic expansion of the Hankel integral: spectacularly accurate asymptotic expansions and non-asymptotic scales.
abstract: We obtain an exactification of the Poincaré asymptotic expansion (PAE) of the Hankel integral, [Formula: see text] as [Formula: see text], using the distributional approach of McClure & Wong. We find that, for half-integer orders of the Bessel function, the exactified asymptotic series terminates, so that it gives an exact finite sum representation of the Hankel integral. For other orders, the asymptotic series does not terminate and is generally divergent, but is amenable to superasymptotic summation, i.e. by optimal truncation. For specific examples, we compare the accuracy of the optimally truncated asymptotic series owing to the McClure-Wong distributional method with owing to the Mellin-Barnes integral method. We find that the former is spectacularly more accurate than the latter, by, in some cases, more than 70 orders of magnitude for the same moderate value ofb. Moreover, the exactification can lead to a resummation of the PAE when it is exact, with the resummed Poincaré series exhibiting again the same spectacular accuracy. More importantly, the distributional method may yield meaningful resummations that involve scales that are not asymptotic sequences.
authors: Theoretical Physics Group, National Institute of Physics , University of the Philippines , Diliman Quezon City, 1101 The Philippines.
authors: Eric A
authors: EA
authors: Galapon
authors: Theoretical Physics Group, National Institute of Physics , University of the Philippines , Diliman Quezon City, 1101 The Philippines ; Siliman University , Dumaguete City, 6200 The Philippines.
authors: Kay Marie L
authors: KM
authors: Martinez
keywords: Hankel integral; asymptotics; distributional approach