{"product_id":"cptera-cpt-theorem","title":"Cptera – The CPT Theorem \/ CPT Physics Sticker","description":"\u003cp\u003eCptera, a hooded keeper of symmetries, holds three glowing violet orbs joined around a bright centre.\u003c\/p\u003e\u003ch3\u003eThe Physics\u003c\/h3\u003e\u003cp\u003eFlip all charges (C), mirror space (P) and run time backwards (T), all at once, and any local, Lorentz-invariant quantum field theory looks exactly the same. This CPT theorem was worked out by Julian Schwinger (1951), Gerhart Lüders (1954) and Wolfgang Pauli (1955). It forces a particle and its antiparticle to have exactly equal mass and lifetime.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCPT: C × P × T is an exact symmetry\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eC: charge conjugation, particle ↔ antiparticle\u003c\/li\u003e\n\u003cli\u003eP: parity, mirror reflection of space\u003c\/li\u003e\n\u003cli\u003eT: time reversal\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThe separate symmetries can break. In 1957 Wu showed P is violated, and in 1964 Christenson, Cronin, Fitch and Turlay found CP violation in neutral kaon decays (Phys. Rev. Lett. 13, 138). Because CPT holds, CP violation means T violation as well.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eHonest caveat:\u003c\/em\u003e CPT is a theorem about a class of theories, not a proof about nature; experiments test it, for instance by comparing kaon and antikaon or proton and antiproton masses, and so far it holds.\u003c\/p\u003e\u003ch3\u003eOn the sticker\u003c\/h3\u003e\u003cp\u003eCptera cups a bright point of light circled by three glowing violet orbs. Printed text: \u003cstrong\u003eCPTERA\u003c\/strong\u003e with the line \u003cstrong\u003eCPT\u003c\/strong\u003e. Pixel-art kiss-cut vinyl sticker, white, in 2″, 3″, 4″ and 6″ sizes.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"2\" × 2\" \/ White","offer_id":50964269727847,"sku":"16524080603557535992","price":4.99,"currency_code":"USD","in_stock":true},{"title":"3\" × 3\" \/ White","offer_id":50964269760615,"sku":"37020673988244805527","price":6.99,"currency_code":"USD","in_stock":true},{"title":"4\" × 4\" \/ White","offer_id":50964269793383,"sku":"26663106118540279314","price":8.99,"currency_code":"USD","in_stock":true},{"title":"6\" × 6\" \/ White","offer_id":50964269826151,"sku":"96922994850227658567","price":11.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/822107823454653601_1200.jpg?v=1793663933","url":"https:\/\/pixelatedphysics.com\/nl\/products\/cptera-cpt-theorem","provider":"Pixelated Physics","version":"1.0","type":"link"}