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## Re: [ESPResSo] mbtools-fluctuations-bending modulus

**From**: |
Tristan Bereau |

**Subject**: |
Re: [ESPResSo] mbtools-fluctuations-bending modulus |

**Date**: |
Wed, 13 Jan 2010 15:54:06 -0800 |

Dear Martina,
I'm not sure about this, but it could be that the <|h(q)|^2> already contains
the L^2 term. That way, you wouldn't have to multiply by it. What value of
kappa do you get if you don't multiply by L^2? Just plot the power spectrum as
you're doing now and calculate 1/a, where a is the value of the straight line.
As far as I remember, you should get a value of kappa between 25 and 35 kT for
a flat bilayer.
Best,
Tristan
On Jan 12, 2010, at 1:55 , martina pannuzzo wrote:
>* Dear all,*
>* i need a clarification about the example fitting gnuplot script in the*
>* file fluctuation.tcl in the mbtools package.*
>* The k that you are calculating is the bending modulus ( express in*
>* units epslon)? When i try to calculate the bending modulus plotting*
>* 1/q^-4 vs <|h(q)|^2> (of the power-dat file) i obtain a constant that*
>* i moltiplicate for L^2, but i obtain a k value different and*
>* completly wrong. Please, can anyone help me?*
>* thanks in advance.*
>* Martina*
>* *
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