High Energy Physics News & Events

Abstract: I will present the influence of the chiral anomaly on the evolution of magnetohydrodynamics. In the early universe, before electroweak symmetry breaking, and in systems at high enough temperatures such that the electron mass can be ignored, the general description of a charged plasma needs to take into account the triangle anomaly. The interplay between turbulence and chiral magnetic effect can have important consequences on the evolution of magnetic fields, leading to the creation of maximally-helical fields from initially non-helical ones. Chiral effects can support a turbulent inverse cascade, causing a slower decrease of magnetic field with time and a faster growth of correlation length, when compared to the evolution predicted by the standard magnetohydrodynamical description. Using the weak anomaly approximation, specific solutions for the inverse cascade regime that show how chiral effects support it are derived.

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Abstract: We discuss the possibility that dark matter corresponds to an oscillating scalar field coupled to the Higgs boson. We argue that the initial field amplitude should generically be of the order of the Hubble parameter during inflation, as a result of its quasi-de Sitter fluctuations. This implies that such a field may account for the present dark matter abundance for masses in the range 10^−6–10^−4 eV, if the tensor-to-scalar ratio is within the range of planned CMB experiments. We show that such mass values can naturally be obtained through either Planck-suppressed non-renormalizable interactions with the Higgs boson or, alternatively, through renormalizable interactions within the Randall–Sundrum scenario, where the dark matter scalar resides in the bulk of the warped extra-dimension and the Higgs is confined to the infrared brane.

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Abstract: In this talk I will present our recent work on a non-supersymmetric trinification GUTwith a global SU(3) flavour symmetry. The SU(3) flavour symmetry solves many of thepersistent issues of traditional trinification model building, where models typically contain anuncomfortably large number of free parameters and naturally prefers GUT scale masses forthe Standard Model (SM) fermions. In our model, the trinification symmetry group (gaugeand global) is spontaneously broken down to the standard Left-Right symmetric gauge group,together with an extra SU(2)×U(1) global symmetry. Upon integrating out the heavy statesat this scale, we obtain an effective Left-Right symmetric model which spontaneously breaksto the SM gauge group at a lower scale by means of RG running.