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Physics, Volume 2, Issue 2

June 2020 - 10 articles

Cover Story: The measurement in 1947 of the energy difference between the 2s1/2 and 2p1/2 levels of the hydrogen atom, the Lamb shift, began a revolution in modern physics. The ingenious two-page calculation by Bethe included the effects of the quantum vacuum on atomic energy levels and tamed the infinities arising in the computation of the radiative shift, leading to modern quantum electrodynamics. This paper gives the history of this milestone and discusses radiative shifts for two central force systems, the harmonic oscillator and hydrogen atom, from a classical and quantum perspective. The Lamb shift is calculated in a fundamental way based on the equations of motion to emphasize the physical processes and develop a simple model to understand the results. For comparison, the radiative shift for a relativistic harmonic oscillator is calculated. View this paper.
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Articles (10)

  • Article
  • Open Access
29 Citations
6,112 Views
15 Pages

22 June 2020

Within the context of Greece promising a success story in the fight against the disease, this paper proposes a novel method for studying the evolution of the Greek COVID-19 infection curve in relation to the anti-COVID-19 policies applied to control...

  • Article
  • Open Access
14 Citations
4,494 Views
16 Pages

20 June 2020

Electrically driven adsorption, electroadsorption, is at the core of technologies for water desalination, energy production, and energy storage using electrolytic capacitors. Modeling can be crucial for understanding and optimizing these devices, and...

  • Article
  • Open Access
14 Citations
5,261 Views
32 Pages

12 June 2020

Transverse momentum spectra of negative and positive pions produced at mid-(pseudo)rapidity in inelastic or non-single-diffractive proton-proton collisions over a center-of-mass energy, s , range from a few GeV to above 10 TeV are analyzed by...

  • Hypothesis
  • Open Access
2 Citations
12,961 Views
64 Pages

Hypothesis about Enrichment of Solar System

  • Elizabeth P. Tito and
  • Vadim I. Pavlov

9 June 2020

Despite significant progress in the understanding of galactic nucleosynthesis and its influence on the solar system neighborhood, challenges remain in the understanding of enrichment of the solar system itself. Based on the detailed review of multi-d...

  • Article
  • Open Access
43 Citations
8,060 Views
16 Pages

Covid-19 Predictions Using a Gauss Model, Based on Data from April 2

  • Janik Schüttler,
  • Reinhard Schlickeiser,
  • Frank Schlickeiser and
  • Martin Kröger

5 June 2020

We study a Gauss model (GM), a map from time to the bell-shaped Gaussian function to model the deaths per day and country, as a simple, analytically tractable model to make predictions on the coronavirus epidemic. Justified by the sigmoidal nature of...

  • Article
  • Open Access
4 Citations
5,701 Views
13 Pages

Quantum Hopfield Model

  • Masha Shcherbina,
  • Brunello Tirozzi and
  • Camillo Tassi

27 May 2020

We find the free-energy in the thermodynamic limit of a one-dimensional XY model associated to a system of N qubits. The coupling among the σ i z is a long range two-body random interaction. The randomness in the couplings is the typical inte...

  • Article
  • Open Access
22 Citations
6,436 Views
7 Pages

19 May 2020

For Germany, it is predicted that the first wave of the corona pandemic disease reaches its maximum of new infections on 11 April 2020 − 3.4 + 5.4 days with 90% confidence. With a delay of about 7 days the maximum demand on breathin...

  • Article
  • Open Access
26 Citations
25,148 Views
14 Pages

6 May 2020

Faraday’s Law of induction is often stated as “a change in magnetic flux causes an electro-motive force (EMF)”; or, more cautiously, “a change in magnetic flux is associated with an EMF”. It is as well that the more caut...

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Physics - ISSN 2624-8174Creative Common CC BY license