8 papers found.

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Abstract We perform a comparative study of the time dependence of the holographic quantum complexity of some space like singular bulk gravitational backgrounds. This is done by considering the two available notions of complexity, one that relates it to the maximal spatial volume and the other that relates it to the classical action of the Wheeler-de Witt patch. We calculate and...

We analyze the two-dimensional ℂP N − 1 sigma model defined on a finite space interval L, with various boundary conditions, in the large N limit. With the Dirichlet boundary condition at the both ends, we show that the system has a unique phase, which smoothly approaches in the large L limit the standard 2D ℂP N − 1 sigma model in confinement phase, with a constant mass generated...

We study the effects of the CP-breaking topological θ-term in the large N c QCD model by Witten, Sakai and Sugimoto with N f degenerate light flavors. We first compute the ground state energy density, the topological susceptibility and the masses of the lowest lying mesons, finding agreement with expectations from the QCD chiral effective action. Then, focusing on the N f = 2...

We revisit the study of singular points in the Coulomb branch of \( \mathcal{N}=2 \) SQCD in four dimensions with gauge group SU(N). For certain choices of the mass parameters these vacua are not lifted by a mass term for the chiral multiplet in the adjoint representation. By using recent results about the M5 brane description of \( \mathcal{N}=1 \) theories we study the...

**Stefano** **Bolognesi**
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Paul Sutcliffe
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Department of Mathematical Sciences, Durham University
, South Road, Durham DH1 3LE,
U.K
The Sakai-Sugimoto model is the preeminent example of a string theory

Geometric and dynamical aspects of a coupled 4D-2D interacting quantum field theory — the gauged nonAbelian vortex — are investigated. The fluctuations of the internal 2D nonAbelian vortex zeromodes excite the massless 4D Yang-Mills modes and in general give rise to divergent energies. This means that the well-known 2D \( \mathrm{\mathbb{C}}{\mathrm{\mathbb{P}}}^{N-1...

In the large flux limit vortices become flux tubes with almost constant magnetic field in the interior region. This occurs in the case of non-Abelian vortices as well, and the study of such configurations allows us to reveal a close relationship between vortex zero modes and the gyromagnetic instabilities of vector bosons in a strong background magnetic field discovered by...