Double field theory [1] is an attempt to realize T-duality of string theory at the level of field theory. For instance, if a field in ordinary field theory lives in 4 non-compact spacetime dimensions, then a field in double field theory lives in 8 non-compact spacetime dimensions.(adsbygoogle = window.adsbygoogle || []).push({});

I don't understand it from the physical point of view. If the field lives in 8 non-compact dimensions, then why do we see only 4 dimensions? Or if fields of double field theory are not supposed to be observable, then what is the point of introducing them in the first place? What do I miss?

[1] For a review see e.g. https://arxiv.org/abs/1305.1907

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# Featured A Double field theory: Where is the extra space?

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