Zobrazeno 1 - 10
of 79
pro vyhledávání: '"Steinwachs, Christian F."'
Autor:
Steinwachs, Christian F.
We investigate the non-perturbative renormalization group flow of the scalar Galileon model in flat space. We discuss different expansion schemes of the Galileon truncation, including a heat-kernel based derivative expansion, a vertex expansion in mo
Externí odkaz:
http://arxiv.org/abs/2101.07271
Publikováno v:
Eur. Phys. J. C 81, 460 (2021)
We propose an extension of the scalaron-Higgs model by a non-minimal coupling of the Standard Model Higgs boson to the quadratic Ricci scalar resulting in a Higgs-dependent scalaron mass. The model predicts a successful stage of effective single-fiel
Externí odkaz:
http://arxiv.org/abs/2011.09485
Publikováno v:
Phys. Rev. D 103, 083518 (2021)
We investigate the production of primordial black holes and their contribution to the presently observed dark matter in a dilaton two-field extension of Starobinsky's quadratic $f(R)$ model of inflation. The model features a multi-field amplification
Externí odkaz:
http://arxiv.org/abs/2011.05999
Autor:
Steinwachs, Christian F.
Publikováno v:
Front. Phys., 21 July 2020
For any fundamental quantum field theory, unitarity, renormalizability, and relativistic invariance are considered to be essential properties. Unitarity is inevitably connected to the probabilistic interpretation of the quantum theory, while renormal
Externí odkaz:
http://arxiv.org/abs/2004.07842
Publikováno v:
Phys. Rev. D 101, 124046 (2020)
We find new static, spherically symmetric, and asymptotically flat vacuum solutions without horizon in Starobinsky's quadratic f(R) gravity. We systematically classify these solutions by an asymptotic analysis around the origin and find seven differe
Externí odkaz:
http://arxiv.org/abs/2003.12109
Autor:
Steinwachs, Christian F.
The accelerated expansion of the early universe is an integral part of modern cosmology and dynamically realized by the mechanism of inflation. The simplest theoretical description of the inflationary paradigm is based on the assumption of an additio
Externí odkaz:
http://arxiv.org/abs/1909.10528
We investigate the renormalization structure of the scalar Galileon model in flat spacetime by calculating the one-loop divergences in a closed geometric form. The geometric formulation is based on the definition of an effective Galileon metric and a
Externí odkaz:
http://arxiv.org/abs/1909.07111
We investigate the renormalization structure of scalar Galileons in flat spacetime. We explicitly calculate the ultraviolet divergent one-loop contributions to the 2-point, 3-point, 4-point, and 5-point functions. We discuss the structure of the coun
Externí odkaz:
http://arxiv.org/abs/1909.04662
Autor:
Steinwachs, Christian F.
An efficient way to calculate one-loop counterterms within the Feynman diagrammatic approach and dimensional regularization is to expand the propagators in the integrands of the Feynman integrals around vanishing external momentum. In this way, a gen
Externí odkaz:
http://arxiv.org/abs/1909.00810
We derive the first quantum gravitational corrections to the inflationary power spectra for a general single-field scalar-tensor theory which includes a non-minimal coupling to gravity, a non-standard scalar kinetic term and an arbitrary potential of
Externí odkaz:
http://arxiv.org/abs/1904.12861