Quantcast
  • Register
PhysicsOverflow is a next-generation academic platform for physicists and astronomers, including a community peer review system and a postgraduate-level discussion forum analogous to MathOverflow.

Welcome to PhysicsOverflow! PhysicsOverflow is an open platform for community peer review and graduate-level Physics discussion.

Please help promote PhysicsOverflow ads elsewhere if you like it.

News

PO is now at the Physics Department of Bielefeld University!

New printer friendly PO pages!

Migration to Bielefeld University was successful!

Please vote for this year's PhysicsOverflow ads!

Please do help out in categorising submissions. Submit a paper to PhysicsOverflow!

... see more

Tools for paper authors

Submit paper
Claim Paper Authorship

Tools for SE users

Search User
Reclaim SE Account
Request Account Merger
Nativise imported posts
Claim post (deleted users)
Import SE post

Users whose questions have been imported from Physics Stack Exchange, Theoretical Physics Stack Exchange, or any other Stack Exchange site are kindly requested to reclaim their account and not to register as a new user.

Public \(\beta\) tools

Report a bug with a feature
Request a new functionality
404 page design
Send feedback

Attributions

(propose a free ad)

Site Statistics

205 submissions , 163 unreviewed
5,047 questions , 2,200 unanswered
5,345 answers , 22,709 comments
1,470 users with positive rep
816 active unimported users
More ...

Recent questions tagged duality

A duality is a sort-of equivalence between two objects or theories under a certain condition. Very useful in QFT and string theory.

List of some dualities in physics:

  • S-duality (in string theory and quantum field theory)

    Involves the reciprocal of the coupling constant. Theory A is said to be S-dual to Theory B if Theory A with coupling constant $g$ is the equivalent of Theory B with coupling constant $\frac1g$. In string theory, this is the same as negating the dilaton field, as $g=\langle e^{\phi}\rangle$.

  • T-duality (in string theory)

    Involves the reciprocal of the compactification radius. Theory A is said to be T-dual to Theory B if Theory A with compactification radius $R$ is the equivalent of Theory B with compactification radius $\frac{\alpha'}{R}$, which is simply $\frac1R$ if we chose to use natural units where we let $\ell_s=1$.

  • AdS/CFT (in string theory = conformal field theory, for example. However, there are generalisations which also include AdS/QCD, AdS/CMT, etc.)

    Relates a string theory or quantum gravitational theory in a certain AdS spacetime to one conformal field theory on the conformal boundary of the AdS spacetime. Prominent examples include BFSS Matrixz theory and Matrix string theoryies (IIA and HE).

  • Electromagnetic duality (in a whole lot of stuff)

    Self-explanatory. Dualities which are like EM. In EM, field - strengths can be described by the electric field part, whereas the dual field strengths can be described by the magnetic field part. Useful even in string theory, where $Dp$ - branes are EM-dual to $D(6-p)$ - branes.

+ 2 like - 0 dislike
0 answers 451 views
+ 1 like - 0 dislike
0 answers 1257 views
+ 2 like - 0 dislike
0 answers 720 views
+ 4 like - 0 dislike
0 answers 922 views




user contributions licensed under cc by-sa 3.0 with attribution required

Your rights
...