y***@fas.harvard.edu

2006-06-22 02:25:21 UTC

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I just wonder if there are any known models that suggest higgs-likeRaw Message

potential (Sigma a phi_a^2-constant)^2 in string phenomenology.

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y***@fas.harvard.edu

2006-06-22 02:25:21 UTC

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I just wonder if there are any known models that suggest higgs-likeRaw Message

potential (Sigma a phi_a^2-constant)^2 in string phenomenology.

A***@gmail.com

2006-07-15 10:51:35 UTC

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I just wonder if there are any known models that suggest higgs-like

potential (Sigma a phi_a^2-constant)^2 in string phenomenology.

susy it is usual to generate a higgs like potential by using the

renormalisation group so that the mass square term becomes negative

when coming to the scale of the top quark. The trick, discovered by

Ibañez time ago, works precisaly because the top mass is far from the

other ones.

In extra dimensional, non string theories, the higgs field is sometimes

associated to the extra dimension, specially when this dimension is

discrete.

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Jack Tremarco

2006-07-15 10:52:23 UTC

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I just wonder if there are any known models that suggest higgs-like

potential (Sigma a phi_a^2-constant)^2 in string phenomenology.

gauge theories in four dimensions with at most eight supercharges (N <=

2). These gauge theories can be realized on a Hanany-Witten type brane

configuration in type IIA. Turning on the potential is accomplished by

introducing a Fayet-Iliopoulos parameter for the diagonal U(1) factor

of the gauge group. In the brane setup this corresponds to breaking

each color D4 on a flavor D6 and removing the two halves of the brane

configuration a finite distance in a flat direction of the internal

space. From this geometry it is clear that the Higgs phase emanates

from one specific point on the Coulomb branch and exists only if N_f >=

N_c.

Sixteen conserved supercharges in 4d (N=4) would force the potential to

be flat. Hence the restriction I mentioned.

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