14,496 research outputs found
An emergent geometric description for a topological phase transition in the Kitaev superconductor model
Resorting to Wilsonian renormalization group (RG) transformations, we propose
an emergent geometric description for a topological phase transition in the
Kitaev superconductor model. An effective field theory consists of an emergent
bulk action with an extra dimension, an ultraviolet (UV) boundary condition for
an initial value of a coupling function, and an infrared (IR) effective action
with a fully renormalized coupling function. The bulk action describes the
evolution of the coupling function along the direction of the extra dimension,
where the extra dimension is identified with an RG scale and the resulting
equation of motion is nothing but a function. In particular, the IR
effective field theory turns out to be consistent with a Callan-Symanzik
equation which takes into account both the bulk and IR boundary contributions.
This derived Callan-Symanzik equation gives rise to a metric structure. Based
on this emergent metric tensor, we uncover the equivalence of the entanglement
entropy between the emergent geometric description and the quantum field theory
in the vicinity of the quantum critical point.Comment: Two figures adde
Holographic Monopole Catalysis of Baryon Decay
We study how monopole catalysis of baryon decay is realized in holographic
QCD. Physics of monopole catalysis becomes much simpler in holographic
description as it occurs due to the violation of the Bianchi identity for the
5D gauge symmetry when magnetic monopole is present. In holographic QCD we find
a unified picture of the baryon number violation under magnetic monopole or
electroweak sphaleron, giving a new mechanism of baryon number violation. We
also embed our set-up in the string theory model by Sakai and Sugimoto.Comment: 18 pages, v2: references adde
Constraining dark photon model with dark matter from CMB spectral distortions
Many extensions of Standard Model (SM) include a dark sector which can
interact with the SM sector via a light mediator. We explore the possibilities
to probe such a dark sector by studying the distortion of the CMB spectrum from
the blackbody shape due to the elastic scatterings between the dark matter and
baryons through a hidden light mediator. We in particular focus on the model
where the dark sector gauge boson kinetically mixes with the SM and present the
future experimental prospect for a PIXIE-like experiment along with its
comparison to the existing bounds from complementary terrestrial experiments.Comment: 6 pages, 8 figure
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