{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T02:19:32Z","timestamp":1760235572097,"version":"build-2065373602"},"reference-count":50,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2021,9,15]],"date-time":"2021-09-15T00:00:00Z","timestamp":1631664000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Symmetry"],"abstract":"<jats:p>An overview of recent progress on testing Lorentz and CPT symmetry using Penning traps is presented. The theory of quantum electrodynamics with Lorentz-violating operators of mass dimensions up to six is summarized. Dominant shifts in the cyclotron and anomaly frequencies of the confined particles and antiparticles due to Lorentz and CPT violation are derived. Existing results of the comparisons of charge-to-mass ratios and magnetic moments involving protons, antiprotons, electrons, and positrons are used to constrain various coefficients for Lorentz violation.<\/jats:p>","DOI":"10.3390\/sym13091703","type":"journal-article","created":{"date-parts":[[2021,9,15]],"date-time":"2021-09-15T12:00:44Z","timestamp":1631707244000},"page":"1703","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Penning-Trap Searches for Lorentz and CPT Violation"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7046-5864","authenticated-orcid":false,"given":"Yunhua","family":"Ding","sequence":"first","affiliation":[{"name":"W.M. Keck Science Department, Claremont McKenna, Pitzer, and Scripps Colleges, Claremont, CA 91711, USA"},{"name":"Department of Physics, Gettysburg College, Gettysburg, PA 17325, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Teague D.","family":"Olewiler","sequence":"additional","affiliation":[{"name":"Department of Physics, Gettysburg College, Gettysburg, PA 17325, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mohammad Farhan","family":"Rawnak","sequence":"additional","affiliation":[{"name":"Department of Physics, Gettysburg College, Gettysburg, PA 17325, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,9,15]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"120801","DOI":"10.1103\/PhysRevLett.100.120801","article-title":"New measurement of the electron magnetic moment and the fine structure constant","volume":"100","author":"Hanneke","year":"2008","journal-title":"Phys. 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