Finite N from resurgent large N
Abstract
Due to instanton effects, gaugetheoretic large N expansions yield asymptotic series, in powers of 1 /N^{2}. The present work shows how to generically make such expansions meaningful via their completion into resurgent transseries, encoding both perturbative and nonperturbative data. Large N resurgent transseries compute gaugetheoretic finite N results nonperturbatively (no matter how small N is). Explicit calculations are carried out within the gauge theory prototypical example of the quartic matrix model. Due to integrability in the matrix model, it is possible to analytically compute (fixed integer) finite N results. At the same time, the large N resurgent transseries for the free energy of this model was recently constructed. Together, it is shown how the resummation of the large N resurgent transseries matches the analytical finite N results up to remarkable numerical accuracy. Due to lack of Borel summability, Stokes phenomena has to be carefully taken into account, implying that instantons play a dominant role in describing the finite N physics. The final resurgence results can be analytically continued, defining gauge theory for any complex value of N.
 Publication:

Annals of Physics
 Pub Date:
 May 2015
 DOI:
 10.1016/j.aop.2015.02.019
 arXiv:
 arXiv:1501.01007
 Bibcode:
 2015AnPhy.356....1C
 Keywords:

 Large N limit;
 Resurgent transseries;
 Multiinstantons;
 Stokes phenomena;
 BorelPadéÉcalle resummation;
 Finite N results;
 High Energy Physics  Theory;
 Condensed Matter  Statistical Mechanics;
 High Energy Physics  Phenomenology;
 Mathematical Physics
 EPrint:
 34 pages, 15 figures, jheppubnosort.sty