{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,14]],"date-time":"2026-03-14T05:30:23Z","timestamp":1773466223010,"version":"3.50.1"},"reference-count":61,"publisher":"AIP Publishing","issue":"5","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2009,5,1]]},"abstract":"<jats:p>We discuss various aspects of multi-instanton configurations in generic multicut matrix models. Explicit formulas are presented in the two-cut case and, in particular, we obtain general formulas for multi-instanton amplitudes in the one-cut matrix model case as a degeneration of the two-cut case. These formulas show that the instanton gas is ultradilute due to the repulsion among the matrix model eigenvalues. We exemplify and test our general results in the cubic matrix model, where multi-instanton amplitudes can be also computed with orthogonal polynomials. As an application, we derive general expressions for multi-instanton contributions in two-dimensional quantum gravity, verifying them by computing the instanton corrections to the string equation. The resulting amplitudes can be interpreted as regularized partition functions for multiple ZZ-branes, which take into full account their backreaction on the target geometry. Finally, we also derive structural properties of the trans-series solution to the Painlev\u00e9 I equation.<\/jats:p>","DOI":"10.1063\/1.3097755","type":"journal-article","created":{"date-parts":[[2009,5,4]],"date-time":"2009-05-04T22:39:27Z","timestamp":1241476767000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":69,"title":["Multi-instantons and multicuts"],"prefix":"10.1063","volume":"50","author":[{"given":"Marcos","family":"Mari\u00f1o","sequence":"first","affiliation":[{"name":"Universit\u00e9 de Gen\u00e8ve 1 Section de Math\u00e9matiques et D\u00e9partement de Physique Th\u00e9orique, , CH-1211 Gen\u00e8ve, Switzerland"}]},{"given":"Ricardo","family":"Schiappa","sequence":"additional","affiliation":[{"name":"Instituto Superior T\u00e9cnico 2 CAMGSD, Departamento de Matem\u00e1tica, , 1049-001 Lisboa, Portugal"}]},{"given":"Marlene","family":"Weiss","sequence":"additional","affiliation":[{"name":"CERN 3 Department of Physics, Theory Division, , CH-1211 Gen\u00e8ve 23, Switzerland"},{"name":"ETH Z\u00fcrich 4 ITP, , CH-8093 Z\u00fcrich, Switzerland"}]}],"member":"317","published-online":{"date-parts":[[2009,5,4]]},"reference":[{"key":"2023080105365873900_c1a","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1016\/0370-1573(94)00084-G","volume":"254","year":"1995","journal-title":"Phys. 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