{"product_id":"monopola-diracs-monopole-physics-t-shirt","title":"Monopola – Dirac's Monopole Physics T-Shirt","description":"\u003cp\u003eMonopola carries a single magnetic pole, field lines bursting out like a sunburst. If she exists anywhere, every charge in the universe has to fall in line.\u003c\/p\u003e\u003ch3\u003eThe Physics\u003c\/h3\u003e\u003cp\u003ePaul Dirac showed that if even one magnetic monopole exists, quantum mechanics forces all electric charge to come in whole-number steps. That would explain why charge is quantised. The monopole needs a singular line, the Dirac string, which cannot be seen if the condition holds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ee g = n ħ c \/ 2   (Gaussian units, n = 0, ±1, ±2, …)\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ee: electric charge\u003c\/li\u003e\n\u003cli\u003eg: magnetic charge of the monopole\u003c\/li\u003e\n\u003cli\u003en: integer\u003c\/li\u003e\n\u003cli\u003eħ: reduced Planck constant\u003c\/li\u003e\n\u003cli\u003ec: speed of light (all in Gaussian units, as printed)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDirac published it in 1931. B. Cabrera (Stanford) recorded one candidate event on 14 Feb 1982 in 151 days of running; it was never repeated.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eHonest caveat:\u003c\/em\u003e No magnetic monopole has ever been confirmed. The monopole field shown on the back is hypothetical.\u003c\/p\u003e\u003ch3\u003eOn the shirt\u003c\/h3\u003e\u003cp\u003eFront: Monopola, the pixel-art character, with the title. Back: the Dirac quantisation condition, the hypothetical monopole field, the Cabrera candidate and both papers. Printed on a unisex tee.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"S \/ White","offer_id":50936476860519,"sku":"11518866334902415315","price":29.99,"currency_code":"USD","in_stock":true},{"title":"S \/ Black","offer_id":50936476893287,"sku":"15281197257504147691","price":29.99,"currency_code":"USD","in_stock":true},{"title":"M \/ White","offer_id":50936476926055,"sku":"16472624918042823048","price":29.99,"currency_code":"USD","in_stock":true},{"title":"M \/ Black","offer_id":50936476958823,"sku":"19129385797276212708","price":29.99,"currency_code":"USD","in_stock":true},{"title":"L \/ White","offer_id":50936476991591,"sku":"12989769505360002733","price":29.99,"currency_code":"USD","in_stock":true},{"title":"L \/ Black","offer_id":50936477024359,"sku":"77679233255853679718","price":29.99,"currency_code":"USD","in_stock":true},{"title":"XL \/ White","offer_id":50936477057127,"sku":"89864653297103191578","price":29.99,"currency_code":"USD","in_stock":true},{"title":"XL \/ Black","offer_id":50936477089895,"sku":"59088164835209731802","price":29.99,"currency_code":"USD","in_stock":true},{"title":"2XL \/ White","offer_id":50936477122663,"sku":"24406705899820514850","price":29.99,"currency_code":"USD","in_stock":true},{"title":"2XL \/ Black","offer_id":50936477155431,"sku":"34006237031110002503","price":29.99,"currency_code":"USD","in_stock":true},{"title":"3XL \/ White","offer_id":50936477188199,"sku":"12579434324631092603","price":29.99,"currency_code":"USD","in_stock":true},{"title":"3XL \/ Black","offer_id":50936477220967,"sku":"67366726390316547700","price":29.99,"currency_code":"USD","in_stock":true},{"title":"4XL \/ White","offer_id":50936477253735,"sku":"27517209817764868040","price":29.99,"currency_code":"USD","in_stock":true},{"title":"4XL \/ Black","offer_id":50936477286503,"sku":"23371448180452720342","price":29.99,"currency_code":"USD","in_stock":true},{"title":"5XL \/ White","offer_id":50936477319271,"sku":"29517999673350637753","price":29.99,"currency_code":"USD","in_stock":true},{"title":"5XL \/ Black","offer_id":50936477352039,"sku":"26548286504627467678","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/dirac-monopole_front_16_white.png?v=1793595305","url":"https:\/\/pixelatedphysics.com\/id\/products\/monopola-diracs-monopole-physics-t-shirt","provider":"Pixelated Physics","version":"1.0","type":"link"}