As you say, the way string theory requires all these extra dimensions and this comes from certain consistency requirements about how string should behave and so on.
Roger Penrose Quotes
Ordinary photons do have spin, they have a notion of helicity so they spin around their direction on motion.
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| Birth: | 8th August, 1931 |
| Nationality: | British |
| Profession: | Professor |
About
Sir Roger Penrose is an English mathematical physicist, recreational mathematician and philosopher. He is the Emeritus Rouse Ball Professor of Mathematics at the Mathematical Institute of the University of Oxford, as well as an Emeritus Fellow of Wadham College.
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