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On a high level, our result shows that the usual spectral gap condition, which concerns the system as a whole, is not a necessary condition for understanding local properties of the system. More precisely, we say that an equilibrium state\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$\\rho _0$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:msub>\n                            <mml:mi>\u03c1<\/mml:mi>\n                            <mml:mn>0<\/mml:mn>\n                          <\/mml:msub>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    of a Hamiltonian\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$H_0$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:msub>\n                            <mml:mi>H<\/mml:mi>\n                            <mml:mn>0<\/mml:mn>\n                          <\/mml:msub>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    is locally gapped in\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$${\\varLambda ^{\\textrm{gap}}}\\subset \\varLambda $$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mrow>\n                            <mml:msup>\n                              <mml:mi>\u039b<\/mml:mi>\n                              <mml:mtext>gap<\/mml:mtext>\n                            <\/mml:msup>\n                            <mml:mo>\u2282<\/mml:mo>\n                            <mml:mi>\u039b<\/mml:mi>\n                          <\/mml:mrow>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    , whenever the Liouvillian\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$- \\textrm{i}\\, [H_0, \\, \\cdot \\, ]$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mrow>\n                            <mml:mo>-<\/mml:mo>\n                            <mml:mtext>i<\/mml:mtext>\n                            <mml:mspace\/>\n                            <mml:mo>[<\/mml:mo>\n                            <mml:msub>\n                              <mml:mi>H<\/mml:mi>\n                              <mml:mn>0<\/mml:mn>\n                            <\/mml:msub>\n                            <mml:mo>,<\/mml:mo>\n                            <mml:mspace\/>\n                            <mml:mo>\u00b7<\/mml:mo>\n                            <mml:mspace\/>\n                            <mml:mo>]<\/mml:mo>\n                          <\/mml:mrow>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    is almost invertible on local observables supported in\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$${\\varLambda ^{\\textrm{gap}}}$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:msup>\n                            <mml:mi>\u039b<\/mml:mi>\n                            <mml:mtext>gap<\/mml:mtext>\n                          <\/mml:msup>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    when tested in\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$\\rho _0$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:msub>\n                            <mml:mi>\u03c1<\/mml:mi>\n                            <mml:mn>0<\/mml:mn>\n                          <\/mml:msub>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    . To put this into context, we provide other alternative notions of a local gap and discuss their relations. The validity of response theory is based on the construction of\n                    <jats:italic>non-equilibrium almost stationary states<\/jats:italic>\n                    (NEASSs). By controlling locality properties of the NEASS construction, we show that response theory holds to any order, whenever the perturbation\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$\\varepsilon V$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mrow>\n                            <mml:mi>\u03b5<\/mml:mi>\n                            <mml:mi>V<\/mml:mi>\n                          <\/mml:mrow>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    acts in a region which is further than\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$|\\log \\varepsilon |$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mrow>\n                            <mml:mo>|<\/mml:mo>\n                            <mml:mo>log<\/mml:mo>\n                            <mml:mi>\u03b5<\/mml:mi>\n                            <mml:mo>|<\/mml:mo>\n                          <\/mml:mrow>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    away from the non-gapped region\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$\\varLambda \\backslash \\varLambda \\textrm{gap}$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mrow>\n                            <mml:mi>\u039b<\/mml:mi>\n                            <mml:mo>\\<\/mml:mo>\n                            <mml:mi>\u039b<\/mml:mi>\n                            <mml:mtext>gap<\/mml:mtext>\n                          <\/mml:mrow>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    .\n                  <\/jats:p>","DOI":"10.1007\/s10955-026-03703-1","type":"journal-article","created":{"date-parts":[[2026,10,12]],"date-time":"2026-10-12T17:40:16Z","timestamp":1791826816000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Response Theory for Locally Gapped Systems"],"prefix":"10.1007","volume":"193","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1106-327X","authenticated-orcid":false,"given":"Joscha","family":"Henheik","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7593-0913","authenticated-orcid":false,"given":"Tom","family":"Wessel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,10,12]]},"reference":[{"issue":"3","key":"3703_CR1","doi-asserted-by":"publisher","first-page":"835","DOI":"10.1007\/s00220-011-1380-0","volume":"309","author":"S Bachmann","year":"2012","unstructured":"Bachmann, S., Michalakis, S., Nachtergaele, B., Sims, R.: Automorphic equivalence within gapped phases of quantum lattice systems. 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