{"product_id":"superlumen-the-phase-velocity-courier-mug","title":"Superlumen, the Phase-Velocity Courier Mug","description":"\u003cp\u003ePhase velocity can exceed c in dispersive media while the signal (front) velocity does not; no information travels faster than light.\u003c\/p\u003e\n\u003cp\u003eThe joke: Fast-talking speakers whose slides move fast but convey nothing. The slogan on the mug reads \u003cstrong\u003ePHASE VELOCITY ABOVE c. NO INFORMATION SENT.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSource: L. Brillouin, Wave Propagation and Group Velocity (Academic Press, 1960).\u003c\/p\u003e","brand":"Pixelated Physics","offers":[{"title":"11oz","offer_id":50980055089255,"sku":"31067003948913097442","price":21.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/3814067525881937930_2048.jpg?v=1793684296","url":"https:\/\/pixelatedphysics.com\/pt\/products\/superlumen-the-phase-velocity-courier-mug","provider":"Pixelated Physics","version":"1.0","type":"link"}