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            <title xml:lang="en">Asymptotically Safe Grand Unification</title>
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            <idno type="stamp" n="UNIV-LYON1">Université Claude Bernard - Lyon I</idno>
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                    <forename type="first">Borut</forename>
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                <term xml:lang="en">central charge</term>
                <term xml:lang="en">superpotential</term>
                <term xml:lang="en">gravitation</term>
                <term xml:lang="en">decoupling</term>
                <term xml:lang="en">unitarity</term>
                <term xml:lang="en">pole</term>
                <term xml:lang="en">supersymmetry</term>
                <term xml:lang="en">grand unified theory</term>
                <term xml:lang="en">scale: Planck</term>
                <term xml:lang="en">matter: exotic</term>
                <term xml:lang="en">fixed point: ultraviolet</term>
                <term xml:lang="en">Supersymmetric gauge theory</term>
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              <p>Phenomenologically appealing supersymmetric grand unified theories have large gauge representations and thus are not asymptotically free. Their ultraviolet validity is limited by the appearance of a Landau pole well before the Planck scale. One could hope that these theories save themselves, before the inclusion of gravity, by generating an interacting ultraviolet fixed point, similar to the one recently discovered in non-supersymmetric gauge-Yukawa theories. Employing a-maximization, a-theorem, unitarity bounds, as well as positivity of other central charges we nonperturbatively rule out this possibility for a broad class of prime candidates of phenomenologically relevant supersymmetric grand unified theories. We also uncover candidates passing these tests, which have either exotic matter or contain one field decoupled from the superpotential. The latter class of theories contains a model with the minimal matter content required by phenomenology.</p>
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