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11 papers · 2 filters
Weyl Invariant Standard Model and its Symmetry Breaking
Wolfgang Drechsler
A standard model is formulated in a Weyl space, , yielding a Weyl covariant dynamics of massless chiral Dirac fermion fields for leptons and quarks as well as the gauge fields…
Effective scalar fields in Yang-Mills theories
H. Verschelde, V. I. Zakharov
Scalar fields play a crucial role in the Standard model. On the other hand, in the weak-coupling regime there is an unsolved problem of the quadratic divergence of scalar masses. T…
Towards Unquenched Holographic Magnetic Catalysis
Veselin G. Filev, Dimitrios Zoakos
We propose a string dual to the SU(Nc) N=4 SYM coupled to Nf massless fundamental flavors in an external magnetic field. The flavors are introduced by homogeneously smeared Nf D7-b…
Complete N-Point Superstring Disk Amplitude II. Amplitude and Hypergeometric Function Structure
Carlos R. Mafra, Oliver Schlotterer, Stephan Stieberger
Using the pure spinor formalism in part I [1] we compute the complete tree-level amplitude of N massless open strings and find a striking simple and compact form in terms of minima…
Complete N-Point Superstring Disk Amplitude I. Pure Spinor Computation
Carlos R. Mafra, Oliver Schlotterer, Stephan Stieberger
In this paper the pure spinor formalism is used to obtain a compact expression for the superstring N-point disk amplitude. The color ordered string amplitude is given by a sum over…
Holographic (De)confinement Transitions in Cosmological Backgrounds
Johanna Erdmenger, Kazuo Ghoroku, Rene Meyer
For type IIB supergravity with a running axio-dilaton, we construct bulk solutions which admit a cosmological background metric of Friedmann-Robertson-Walker type. These solutions…