Search results for "Independence"
showing 10 items of 292 documents
Two Paths to Logical Consequence: Pieri and the Peano School
2021
This chapter1 has two main goals. First, it will explore the “negative” avenue leading from the concepts of independence and consistency to that of logical consequence.
Background independent quantum field theory and gravitating vacuum fluctuations
2019
The scale dependent effective average action for quantum gravity complies with the fundamental principle of Background Independence. Ultimately the background metric it formally depends on is selected self-consistently by means of a suitable generalization of Einstein's equation. Self-consistent backround spacetimes are scale dependent, and therefore "going on-shell" at the points along a given renormalization group (RG) trajectory requires understanding two types of scale dependencies: the (familiar) direct one carried by the off-shell action functional, and an indirect one related to the self-consistent background geometry. This paper is devoted to a careful delineation and analysis of ce…
Bimetric Renormalization Group Flows in Quantum Einstein Gravity
2011
The formulation of an exact functional renormalization group equation for Quantum Einstein Gravity necessitates that the underlying effective average action depends on two metrics, a dynamical metric giving the vacuum expectation value of the quantum field, and a background metric supplying the coarse graining scale. The central requirement of "background independence" is met by leaving the background metric completely arbitrary. This bimetric structure entails that the effective average action may contain three classes of interactions: those built from the dynamical metric only, terms which are purely background, and those involving a mixture of both metrics. This work initiates the first …
En route to Background Independence: Broken split-symmetry, and how to restore it with bi-metric average actions
2014
The most momentous requirement a quantum theory of gravity must satisfy is Background Independence, necessitating in particular an ab initio derivation of the arena all non-gravitational physics takes place in, namely spacetime. Using the background field technique, this requirement translates into the condition of an unbroken split-symmetry connecting the (quantized) metric fluctuations to the (classical) background metric. If the regularization scheme used violates split-symmetry during the quantization process it is mandatory to restore it in the end at the level of observable physics. In this paper we present a detailed investigation of split-symmetry breaking and restoration within the…
Configuration mixing and total muon capture rates
1973
Abstract We modify the Primakoff closure approximation to get independence on the mean neutrino energy and energy weighted sum rules are used for the corrective terms. A near model - independent discussion is then possible, and the total rates are shown to be a very sensitive tool to investigate configuration mixing of the target. Wild discrepancies with experiment would arise if the limit of pure jj or LS couplings are used for 12 C, whereas the Cohen-Kurath wave function gives a very good result.
Asymptotic Safety in Quantum Einstein Gravity: Nonperturbative Renormalizability and Fractal Spacetime Structure
2007
The asymptotic safety scenario of Quantum Einstein Gravity, the quantum field theory of the spacetime metric, is reviewed and it is argued that the theory is likely to be nonperturbatively renormalizable. It is also shown that asymptotic safety implies that spacetime is a fractal in general, with a fractal dimension of 2 on sub-Planckian length scales.
Compositeness of the strange, charm and beauty odd parity $\Lambda$ states
2015
14 pages.- 2 figures.- 5 tables
Microscopic description of dissipative dynamics of a level-crossing transition
2011
We analyze the effect of a dissipative bosonic environment on the Landau-Zener-Stuckelberg-Majorana (LZSM) level crossing model by using a microscopic approach to derive the relevant master equation. For an environment at zero temperature and weak dissipation our microscopic approach confirms the independence of the survival probability on the decay rate that has been predicted earlier by the simple phenomenological LZSM model. For strong decay the microscopic approach predicts a notable increase of the survival probability, which signals dynamical decoupling of the initial state. Unlike the phenomenological model our approach makes it possible to study the dependence of the system dynamics…
Bērnu patstāvīgās darbības veicināšana vizuālās mākslas nodarbībās pirmsskolā
2018
Kvalifikācijas darba temats: bērnu patstāvīgās darbības veicināšana vizuālās mākslas nodarbībās pirmsskolā Darba autore: Dace Klētniece Darba vadītāja: Asoc. prof. Dr. Paed. Mg. Art. Ilze Briška. Mērķis: Izpētīt vidējā pirmsskolas vecuma bērnu patstāvības veicināšanas iespējas vizuālajā mākslā. Pētījuma objekts: vidējā pirmsskolas vecuma bērna patstāvība vizuālajā mākslā. Pētījuma priekšmets: vizuālās mākslas nodarbības vidējā pirmsskolas vecuma bērniem pedagoģiskajā procesā Hipotēze: vidējā pirmsskolas vecuma bērnu patstāvība vizuālās mākslas rotaļnodarbības laikā tiek sekmēta, ja: •Bērnu patstāvīgajai darbībai tiek nodrošināta atbilstoša vide. •Patstāvīgi veidotie darbi tiek lietoti prakt…
Patstāvības veicināšana 3 - 4 gadīgiem bērniem pirmsskolas pedagoģiskajā procesā
2017
Elīna Gabrāne. Kvalifikācijas darba temats ir patstāvības veicināšana 3 - 4 gadīgiem bērniem pirmsskolas pedagoģiskajā procesā. Pētījuma mērķis: : Izzināt 3 - 4 gadīgu bērnu patstāvības veicināšanas pedagoģiskos līdzekļus. Kvalifikācijas darbu veido ievads, divas nodaļas ar apakšnodaļām, ieteikumi un secinājumi par teorētiskās literatūras analīzi un pētījuma praktisko daļu, izmantoto avotu saraksts un pielikumi. Darbā izmantotās metodes: Teorētiskās- literatūras analīze. Pētnieciskās- vērojums, anketēšana, datu statistiskā apstrāde. Teorētiskajā pētījumā analizētas autoru atziņas pedagoģijas un psiholoģijas teorijā. Aplūkota pedagoģiskā procesa būtība un tā raksturīgākās iezīmes pirmsskolā,…