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- Thread starter mertcan
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PeterDonis

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For what does \phi stand

I believe it stands for a scalar field, which is the simplest kind of field (it's just a number at every point of spacetime).

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haushofer

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He calls it a "wave field" around 53:50, but as Peter says it's just a scalar field.

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PeterDonis

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What kind of a scalar field does it stands for

Any scalar field. AFAICT, Susskind is just explaining the general way that the stress-energy tensor of a scalar field works. He is not trying to explain the physics of any particular scalar field. The only property that would have to be assumed is that the field has units of energy density.

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