Potting, RobertusBranco, GCEmmanuelCosta, DFelipe, RGJoaquim, FRLavoura, LPalomaresRuiz, SRebelo, MNRomao, JCSilva, JPSilvaMarcos, JI2018-12-072018-12-0720131742-6588http://hdl.handle.net/10400.1/12051During the past two decades there has been a growing interest in the possibility that Lorentz and/or CPT might not be exact symmetries of Nature. In this short review, we present the current state of affairs, addressing both theoretical and experimental/observational issues. We pay particular attention to the role that has been played by the so-called Standard Model ExtensionengTestsInvarianceSymmetryGravityRelativitySystemLimitsClockKaonKloeconference object10.1088/1742-6596/447/1/012009