# All Questions

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### What does “Field theory limit” means in D/M-branes or supergravity theories? [on hold]

What does "Field theory limit" means in D/M-branes or supergravity theories? Reading some papers related with D/M-branes, they often mention field theory limit, $i.e$, limit of $\alpha\rightarrow 0$,...
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### Conformal group in 2D being a subgroup of Diff/Weyl - Polchinksi's 'String Theory' [on hold]

In the appendix on page 364 of 'String Theory', Polchinski defines the conformal group (Conf) in two dimensions to be the set of all holomorphic maps. On page 85 he explains how Conf is a subgroup of ...
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### Cold dark matter halos and cusps

Cold dark matter is one of the preferred candidates for dark matter. Yet, models such as the NFW and isothermal predict that halos will contain cusps, where the density tends towards infinity, despite ...
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### Are 3 waves that have the same frequency (and wavelength) but different phase differences coherent? [duplicate]

Waves 2 and 3 have different phase differences which remain constant (since the frequency and wavelength is the same) as compared to wave 1 so to get to the point, are the 3 waves coherent?
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### Is the relation between expansion of a liquid with temperature linear?

Say I have a liquid with certain volume. If I heat it, will it expand with a constant rate? $$\frac{T}{V} = k.$$ It is true for gases, is it also true for liquids? And if yes then: is it true for ...
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### LHC: Clumps of protons or continuous stream?

I am curious about the Large Hadron Collider and whether the proton (anti-) beams are clumps of protons (grouped together) or are they roughly equally distributed around the circumference of the ring. ...