# Susskind: "it can be shown".

• A
• MathematicalPhysicist
In summary, Leonard Susskind discusses anomaly cancellation in his talk, which can be found in various string theory books such as Zweibach's book. In gsw, it is discussed in sections 3.1 and 2.3, while Zweibach's second edition goes into detail in section 12.5. One way to understand anomaly cancellation is by using the lightcone gauge to analyze the EOM, after which the Lorentz algebra must be reviewed to ensure Lorentz covariance. Alternatively, choosing three spacetime dimensions can also avoid this anomaly.
MathematicalPhysicist
Gold Member
Where can I read the technical issue Leonard Susskind is talking in the next talk in 3:36?

Is it discussed in Zweibach's book?

In every string theory book. In gsw it is in section 3.1 and 2.3. Zwiebachs second edition treats it in detail in 12.5.

Btw, he is talking about anomaly cancellation. One way to see it is when you use the lightcone gauge to analyse the EOM. After that you have to review the Lorentz algebra, because your treatment is not Lorentz-covariant explicitly. The Lorentz algebra is retained iff you impose certain conditions on the normal ordering constant and the spacetime dimension.

Note that choosing three spacetime dimensions also circumvents this anomaly.

## 1. How can it be shown in science?

In science, "it can be shown" refers to the process of providing evidence and proof for a theory or hypothesis. This can be done through experiments, observations, and mathematical equations.

## 2. Who can show it?

Anyone who has the knowledge and skills in a particular field of science can show or demonstrate a theory or hypothesis. This can include scientists, researchers, and students.

## 3. What does it mean when something can be shown?

When something can be shown in science, it means that there is empirical evidence or logical reasoning to support a theory or hypothesis. It is a way of providing proof and validating scientific claims.

## 4. Can something be shown in more than one way?

Yes, there are multiple ways to show or prove a theory or hypothesis in science. This can include using different methods, experiments, or observations to reach the same conclusion.

## 5. Is "it can be shown" always true in science?

In science, "it can be shown" is not always true, as scientific knowledge is constantly evolving and subject to change. However, it is a crucial aspect of the scientific method to provide evidence and proof for theories and hypotheses.

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