1,721,002 research outputs found
On the superpartner spectrum of gaugino-gauge mediation
No full textAuzzi, Roberto. (2012). On the superpartner spectrum of gaugino-gauge mediation. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/120366
Skyrmion in theories with massless Adjoint Quarks
No full textTalk given at the Fine Theoretical Physics Institute (FTPI) workshop, Continuous Advances in QCD (CAQCD-08), held May 15-18, 2008.Auzzi, Roberto. (2008). Skyrmion in theories with massless Adjoint Quarks. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/37860
Non Abelian Vortices in N = 1∗ and their gravity duals
No full textAuzzi, Roberto; Kumar, S. P.. (2009). Non Abelian Vortices in N = 1∗ and their gravity duals. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/53190
Flavor of quiver-like realizations of effective supersymmetry
No full textWe present a class of supersymmetric models which address the flavor puzzle and have an inverted hierarchy of sfermions. Their construction involves quiver-like models with link fields in generic representations. The magnitude of Standard-Model parameters is obtained naturally and a relatively heavy Higgs boson is allowed without fine tuning. Collider signatures of such models are possibly within the reach of LHC in the near future
Quantum Phases of a Vortex String
No full textWe argue that the world-sheet dynamics of magnetic k-strings in the Higgs phase of the mass-deformed N=4 theory, is controlled by a bosonic O(3) sigma model with anisotropy and a topological theta term. The theory interpolates between a massless O(2) symmetric regime, a massive O(3) symmetric phase and another massive phase with a spontaneously broken Z_2 symmetry. The first two phases are separated by a Kosterlitz-Thouless transition. When \theta = \pi the O(3) symmetric phase flows to an interacting fixed point; sigma model kinks and their dyonic partners become degenerate, mirroring the behaviour of monopoles in the parent gauge theory. This leads to the identification of the kinks with monopoles confined on the string
Newton–Cartan trace anomalies and renormalization group flows
No full textI will discuss trace anomalies for non-relativistic Schrödinger theories in 2+1 dimensions coupled to a Newton–Cartan gravity background, which is used as a source of the energy-momentum tensor. The motivation is to identify candidates for a possible non-relativistic version of the a-theorem for theories with RG flows interpolating between an UV and an IR Schroedinger-invariant non-relativistic conformal fixed points. I will first discuss the general structure of the anomaly, which is determined by the Wess–Zumino consistency condition. Then I will present an explicit calculation for the anomaly in the case of a free scalar and of a free fermion, using heat kernel. There is a type A anomaly which is proportional to 1/m, where m is the mass of the particle. In analogy with the relativistic case, the irreversibility properties of the renormalization group can also be investigated by studying the Wess–Zumino consistency conditions for the trace anomaly of the theory in a Newton Cartan background with space-time dependent couplings
Non-Abelian Vortices at Weak and Strong Coupling in Mass Deformed ABJM Theory
No full textWe find half-BPS vortex solitons, at both weak and strong coupling, in the N=6 supersymmetric mass deformation of ABJM theory with U(N) x U(N) gauge symmetry and Chern-Simons level k. The strong coupling gravity dual is obtained by performing a Z_k quotient of the N=8 supersymmetric eleven dimensional supergravity background of Lin, Lunin and Maldacena corresponding to the mass deformed M2-brane theory. At weak coupling, the BPS vortices preserving six supersymmetries are found in the Higgs vacuum of the theory where the gauge symmetry is broken to U(1) x U(1). The classical vortex solitons break a colour-flavour locked global symmetry resulting in non-Abelian internal orientational moduli and a CP^1 moduli space of solutions. At strong coupling and large k, upon reduction to type IIA strings, the vortex moduli space and its action are computed by a probe D0-brane in the dual geometry. The mass of the D0-brane matches the classical vortex mass. However, the gravity picture exhibits a six dimensional moduli space of solutions, a section of which can be identified as the CP^1 we find classically, along with a Dirac monopole connection of strength k. It is likely that the extra four dimensions in the moduli space are an artifact of the strong coupling limit and of the supergravity approximation
On Uplifted SUSY-Breaking Vacua and Direct Mediation in Generalized SQCD
No full textWe search for viable models of direct gauge mediation, where the SUSY-breaking sector is (generalized) SQCD, which has cosmologically favorable uplifted vacua even when the reheating temperature is well above the messenger scale. This requires a relatively large tadpole term in the scalar potential for the spurion field X and, consequently, we argue that pure (deformed) SQCD is not a viable model. On the other hand, in SQCD with an adjoint, which is natural e.g. in string theory, assuming an appropriate sign in the Kahler potential for X, such metastable vacua are possible
Superspace formulation of the local RG equation
Full text linkWe present the superspace formulation of the local RG equation, a framework for the study of supersymmetric RG flows in which the constraints of holomorphy and R-symmetry are manifest. We derive the consistency conditions associated with super-Weyl symmetry off-criticality and initiate the study of their implications. As examples, we derive an expression for the a-function, and present an analog of the a-maximization equation, which is valid off-criticality. We also apply this machinery to the study of conformal manifolds and give a simple proof that the metric on such manifolds is Kahler
A Light Stop with Flavor in Natural SUSY
No full textThe discovery of a SM-like Higgs boson near 125 GeV and the flavor texture of the Standard Model motivate the investigation of supersymmetric quiver-like BSM extensions. We study the properties of such a minimal class of models which deals naturally with the SM parameters. Considering experimental bounds as well as constraints from flavor physics and Electro-Weak Precision Data, we find the following. In a self-contained minimal model - including the full dynamics of the Higgs sector - top squarks below a TeV are in tension with b->s{\gamma} constraints. Relaxing the assumption concerning the mass generation of the heavy Higgses, we find that a stop not far from half a TeV is allowed. The models have some unique properties, e.g. an enhancement of the h-> b\bar{b},\tau\bar{{\tau}} decays relative to the h->\gamma{\gamma} one, a gluino about 3 times heavier than the stop, an inverted hierarchy of about 3-20 between the squarks of the first two generations and the stop, relatively light Higgsino neutralino or stau NLSP, as well as heavy Higgses and a W' which may be within reach of the LHC
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