16 citations · 45 across the 12 of their papers we have counts for
12 papers
A scaling non-compact QCD axion
Georgios K. Karananas, Mikhail Shaposhnikov
We present a dynamical mechanism for the erasure of inflationary isocurvature perturbations of the non-compact QCD axion. The key ingredient is an early-time runaway exponential po…
QCD axion from broken scale symmetry
Georgios K. Karananas, Mikhail Shaposhnikov
A consistent non-compact axion cosmology requires a non-periodic field, an effective field theory valid sufficiently above the inflationary scale, and a small non-QCD contribution…
A non-compact QCD axion
Georgios K. Karananas, Mikhail Shaposhnikov, Sebastian Zell
We investigate the cosmology of an axion that is fundamentally non-compact. During inflation, fluctuations of the effectively massless field populate many QCD vacua, thereby evadin…
Higgs inflation in Weyl-invariant Einstein-Cartan gravity
Georgios K. Karananas, Mikhail Shaposhnikov
In this short note we analyze the inflationary dynamics in Weyl-invariant Einstein-Cartan gravity coupled to the Standard Model of particle physics. We take the axion-like particle…
Progress in Einstein-Cartan gravity
Mikhail Shaposhnikov
It is well-known that the gravitational force can be obtained by gauging the Lorentz group, which puts gravity on the same footing as the Standard Model fields. The resulting theor…
On the Gravitational Origin of the QCD Axion
Georgios K. Karananas, Mikhail Shaposhnikov, Sebastian Zell
Gravity can give rise to (pseudo)scalar fields, for instance due to torsion. In particular, axions of gravitational origin have been proposed as a minimal and compelling solution t…
Non-renormalizable theories and finite formulation of QFT
Y. Ageeva, P. Petrov, M. Shaposhnikov
In this paper, we show how the finite formulation of QFT based on Callan-Symanzik equations can be generalised to the case of non-renormalizable theories. We derive an equation for…
Weyl-invariant Einstein-Cartan gravity: unifying the strong CP and hierarchy puzzles
Georgios K. Karananas, Mikhail Shaposhnikov, Sebastian Zell
We show that the minimal Weyl-invariant Einstein-Cartan gravity in combination with the Standard Model of particle physics contains just one extra scalar degree of freedom (in addi…
Non-Polynomial Interactions as a Path Towards a Non-Renormalizable UV-Completion
Mikhail Shaposhnikov, Sebastian Zell
We propose a new class of single-field scalar quantum field theories with non-polynomial interactions leading to a two-point Green's function that can be naturally continued beyond…
Exact quantum conformal symmetry, its spontaneous breakdown, and gravitational Weyl anomaly
Mikail Shaposhnikov, Anna Tokareva
The classical Lagrangian of the Standard Model enjoys the symmetry of the full conformal group if the mass of the Higgs boson is put to zero. This is a hint that conformal symmetry…
The fate of the zero mode of the five-dimensional kink in the presence of gravity
M. Shaposhnikov, P. Tinyakov, K. Zuleta
We investigate what becomes of the translational zero-mode of a five-dimensional domain wall in the presence of gravity, studying the scalar perturbations of a thick gravitating do…
Quasilocalized gravity without asymptotic flatness
M. Shaposhnikov, P. Tinyakov, K. Zuleta
We present a toy model of a generic five-dimensional warped geometry in which the 4D graviton is not fully localized on the brane. Studying the tensor sector of metric perturbation…