Zobrazeno 1 - 10
of 80
pro vyhledávání: '"Manuel Hohmann"'
Autor:
Lavinia Heisenberg, Manuel Hohmann
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 5, Pp 1-18 (2024)
Abstract We study linear cosmological perturbations in the most general teleparallel gravity setting, where gravity is mediated by the torsion and nonmetricity of a flat connection alongside the metric. For a general linear perturbation of this geome
Externí odkaz:
https://doaj.org/article/dc083a40d9c04f69a831115f082a0adc
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 12, Pp 1-25 (2023)
Abstract We write down the teleparallel equivalent to Hassan–Rosen bigravity, which is written using a torsionful but curvature-free connection. The theories only differ by a boundary term. The equivalence was proven, both by using perturbation the
Externí odkaz:
https://doaj.org/article/0d6388619c8545a9b043772ed42fcef0
Publikováno v:
Ultrasound International Open, Vol 10, Iss (2024)
Purpose Freehand sonographic percutaneous puncture techniques for the renal calyceal system are on the rise. Much time and practice are required to master this technique. Navigation-supported puncture aids could help make percutaneous access easie
Externí odkaz:
https://doaj.org/article/5f4cf1e7261341ae99dc353e8f525aee
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 4, Pp 1-18 (2023)
Abstract We derive the most general homogeneous and isotropic teleparallel geometries, defined by a metric and a flat, affine connection. We find that there are five branches of connection solutions, which are connected via several limits, and can fu
Externí odkaz:
https://doaj.org/article/fae353698c624da5b69cc4a341402dca
Autor:
Sebastian Bahamonde, Konstantinos F. Dialektopoulos, Manuel Hohmann, Jackson Levi Said, Christian Pfeifer, Emmanuel N. Saridakis
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 3, Pp 1-17 (2023)
Abstract The study of cosmological perturbation theory in f(T) gravity is a topic of great interest in teleparallel gravity since this is one of the simplest generalizations of the theory that modifies the teleparallel equivalent of general relativit
Externí odkaz:
https://doaj.org/article/afa01b9e3cf941029c4c96885482a575
Autor:
Manuel Hohmann, Christian Pfeifer
Publikováno v:
Physics Letters B, Vol 834, Iss , Pp 137437- (2022)
We study tensor perturbations around the most general cosmologically symmetric backgrounds in a class of teleparallel gravity theories known as New General Relativity. These theories comprise a one-parameter class, which is fully consistent with obse
Externí odkaz:
https://doaj.org/article/def39b3d2497472baefd5273b58d57c1
Autor:
Manuel Hohmann
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 6, Pp 1-33 (2021)
Abstract We present a package for the computer algebra system Mathematica, which implements the parametrized post-Newtonian (PPN) formalism. This package, named xPPN, is built upon the widely used tensor algebra package suite xAct, and in particular
Externí odkaz:
https://doaj.org/article/6e56c4d2d61846edbfd035e835998717
Autor:
Manuel Hohmann, Christian Pfeifer
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 4, Pp 1-14 (2021)
Abstract We consider the most general teleparallel theory of gravity whose action is a linear combination of the five scalar invariants which are quadratic in the torsion tensor. Since two of these invariants possess odd parity, they naturally allow
Externí odkaz:
https://doaj.org/article/2285b50b83bb4f2f9ec48049e36fec70
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 9, Pp 1-4 (2020)
Abstract A description of many-particle systems, which is more fundamental than the fluid approach, is to consider them as a kinetic gas. In this approach the dynamical variable in which the properties of the system are encoded, is the distribution o
Externí odkaz:
https://doaj.org/article/1e2bb9d6aee44d76b51bac6918c7599a
Autor:
Manuel Hohmann
Publikováno v:
Universe, Vol 7, Iss 5, p 114 (2021)
We study the variational principle and derivation of the field equations for different classes of teleparallel gravity theories, using both their metric-affine and covariant tetrad formulations. These theories have in common that, in addition to the
Externí odkaz:
https://doaj.org/article/0395adce332944f98f5c1f9e051a419b