Perspectives on Decay and Time Evolution of Metastable States: From Particle Physics to Cosmology.
The ramifications of the spontaneous decay process in understanding nature and its applications are widely spread. It is the photon emission of excited atoms which gives information of the matter far away from our sun. It is the beta decay which plays a decisive role in the nucleosynthesis of elements heavier than iron. It is the alpha decay of thorium and uranium which in part heats up the inner core of the earth, making it fluid, allowing for the continental drift and the magnetic field. It is the inverse beta decay supplying us with the positron needed in medical tomography whose one version relies on the decay of the positronium.
The present special issue consists of articles which deal with instability from a scale as small as that of elementary particles to that of the universe itself. On the way, the authors discover interesting phenomena related to the effects of relativity, violation of symmetries, and the bizarre behaviour of the universe under certain conditions. Chen and Wang, for example, consider the tunneling of the universe within the scenario of an inhomogeneous quantum vacuum and, calculating the tunneling amplitude of the universe from nothing, they find that the inhomogeneity leads to a faster tunneling. In contrast to this approach which uses the Friedmann-Lemaitre-Robertson-Walker metric, M. Gogberashvili considers a different approach using Einstein's static universe metric and investigates the effects of the strong static gravitational field. A. Stachowski et al. bring in a new player, the metastable dark energy, in the investigation of the evolution of the universe. G. J. M. Zilioti et al. attempt to resolve some cosmological puzzles within decaying vacuum models. A completely different approach using concepts from statistical physics is introduced by Z. Haba to study the evolution of the expanding universe. Going over to smaller scales, the paper by T. V. Obikhod and I. A. Petrenko studies the properties of new particles predicted by the theories of extra dimensions. The survival probabilities of moving unstable particles are considered by E. V. Stefanovich, F. Giraldi, and F. Giacosa in three different papers. The feasibility of testing the time reversal symmetry in a purely leptonic system is reported by the Jagellonian-PET team from their pilot measurement involving the three photon decay of a positronium atom. Finally, the probability distribution of tunneling times of particles in connection with the recent laser induced tunnel ionization experiments is presented by J. T. Lunardi and L. A. Manzoni.
Conflicts of Interest
The editors declare that there are no conflicts of interest regarding the publication of this special issue.
N. G. Kelkar
K. Urbanowski (iD), (1) N. G. Kelkar (iD), (2) M. Nowakowski (iD), (2) and M. Szydlowski (iD) (3)
(1) Institute of Physics, University ofZielona Gora, Prof. Z. Szafrana 4a, 65-516 Zielona Gora, Poland
(2) Departamento de Fisica, Universidad de los Andes, Cra 1E, 18A-10, Bogota, Colombia
(3) Astronomical Observatory, Jagiellonian University, Orla 171, 30-244 Krakow, Poland
Correspondence should be addressed to K. Urbanowski; firstname.lastname@example.org
Received 26 August 2018; Accepted 26 August 2018; Published 12 December 2018
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|Author:||Urbanowski, K.; Kelkar, N.G.; Nowakowski, M.; Szydlowski, M.|
|Publication:||Advances in High Energy Physics|
|Date:||Jan 1, 2018|
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