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2,104 Results Found

  • Article
  • Open Access
2 Citations
3,339 Views
9 Pages

19 September 2021

The classical uncertainty principle inequalities are imposed over the general relativity geodesic equation as a mathematical constraint. In this way, the uncertainty principle is reformulated in terms of proper space–time length element, Planck lengt...

  • Proceeding Paper
  • Open Access
1,228 Views
5 Pages

Reflection Theory holds that our sensations reflect physical properties, whereas Empiricism believes that sense (data), presentations, and phenomena are the ultimate existence. Lenin adhered to Reflection Theory and criticized Helmholtz’s senso...

  • Article
  • Open Access
15 Citations
4,026 Views
33 Pages

10 February 2021

The implications of the general covariance principle for the establishment of a Hamiltonian variational formulation of classical General Relativity are addressed. The analysis is performed in the framework of the Einstein-Hilbert variational theory....

  • Article
  • Open Access
5 Citations
3,553 Views
32 Pages

We designed a teaching–learning sequence on relative motion in classical mechanics, based on the model of educational reconstruction and on the fundamental design principle of highlighting those conceptual elements which could be valuable in th...

  • Article
  • Open Access
31 Citations
8,151 Views
37 Pages

12 September 2017

The determination of the probability distribution function (PDF) of uncertain input and model parameters in engineering application codes is an issue of importance for uncertainty quantification methods. One of the approaches that can be used for the...

  • Article
  • Open Access
10 Citations
4,577 Views
22 Pages

11 March 2013

The many moments model for dense gases and macromolecular fluids is considered here, where the upper order moment is chosen in accordance to the suggestions of the non-relativistic limit of the corresponding relativistic model. The solutions of the r...

  • Article
  • Open Access
10 Citations
8,591 Views
17 Pages

No Preferred Reference Frame at the Foundation of Quantum Mechanics

  • William Stuckey,
  • Timothy McDevitt and
  • Michael Silberstein

22 December 2021

Quantum information theorists have created axiomatic reconstructions of quantum mechanics (QM) that are very successful at identifying precisely what distinguishes quantum probability theory from classical and more general probability theories in ter...

  • Article
  • Open Access
3 Citations
3,664 Views
12 Pages

15 October 2019

The problem of determining inverses for maps in commutative diagrams arising in various problems of a new paradigm in algebraic system theory based on a single principle—the general principle of isomorphism is considered. Based on the previousl...

  • Review
  • Open Access
3 Citations
4,173 Views
11 Pages

12 October 2022

Quantum gravity theories rely on a minimal measurable length for their formulations, which clashes with the classical formulation of the uncertainty principle and with Lorentz invariance from general relativity. These incompatibilities led to the dev...

  • Editorial
  • Open Access
35 Citations
7,134 Views
6 Pages

20 September 2019

The Landauer principle quantifies the thermodynamic cost of the recording/erasure of one bit of information, as it was stated by its author: “information is physical” and it has an energy equivalent. In its narrow sense, the Landauer prin...

  • Review
  • Open Access
3 Citations
4,410 Views
30 Pages

24 July 2023

Albert Einstein visited Spain only once, precisely one hundred years ago. The circumstances, of a very different kind, of this visit will be explained here. In special, some important events happened to Einstein during that period, which, eventually,...

  • Article
  • Open Access
2,172 Views
13 Pages

Relative Tail Pressure with Subadditive Potentials

  • Xianfeng Ma,
  • Baoli Liu and
  • Ercai Chen

29 November 2019

The relative tail pressure with subadditive potentials is introduced via open random covers for continuous bundle random transformations. A variational principle is established and the defined pressure turns out to be invariant under the principal ex...

  • Proceeding Paper
  • Open Access
1,966 Views
7 Pages

The need to transform scientific knowledge to materials suitable for teaching school students is a constant challenge for the educational community. Although it has been more than a century since quantum mechanics and the theory of relativity were es...

  • Article
  • Open Access
10 Citations
2,887 Views
16 Pages

16 April 2020

The manifestly-covariant Hamiltonian structure of classical General Relativity is shown to be associated with a path-integral synchronous Hamilton variational principle for the Einstein field equations. A realization of the same variational principle...

  • Article
  • Open Access
2 Citations
2,766 Views
12 Pages

10 December 2018

We show that probabilities in quantum physics can be derived from permutation-symmetry and the principle of indifference. We then connect unitary-symmetry to the concept of “time” and define a thermal time-flow by symmetry breaking. Final...

  • Technical Note
  • Open Access
3,387 Views
15 Pages

The optical equivalence principle is analyzed according to the possibility of describing unbounded states, and the suitable approximations are calculated for highly energetic phenomena. Among these possibilities, the relevance for laser fields, inter...

  • Article
  • Open Access
9 Citations
16,916 Views
30 Pages

4 December 2020

The principle of certainty of taxation is the dimension of a general requirement of certainty in the legal system. The purpose of this article is to argue the thesis that uncertainty in tax law is not always an absolute evil, sometimes it acts as a m...

  • Article
  • Open Access
2,290 Views
10 Pages

22 July 2024

The problem of formulating thermodynamics in a relativistic scenario remains unresolved, although many proposals exist in the literature. The challenge arises due to the intrinsic dynamic structure of spacetime as established by the general theory of...

  • Article
  • Open Access
1 Citations
1,367 Views
24 Pages

16 August 2025

We present a novel derivation of the spacetime metric generated by matter, without invoking Einstein’s field equations. For static sources, the metric arises from a relativistic formulation of D’Alembert’s principle, where the inert...

  • Article
  • Open Access
2 Citations
2,081 Views
12 Pages

Tidal Effects and Clock Comparison Experiments

  • Cheng-Gang Qin,
  • Tong Liu,
  • Jin-Zhuang Dong,
  • Xiao-Yi Dai,
  • Yu-Jie Tan and
  • Cheng-Gang Shao

Einstein’s general relativity theory provides a successful understanding of the flow of time in the gravitational field. From Einstein’s equivalence principle, the influence of the Sun and Moon masses on clocks is given in the form of tid...

  • Article
  • Open Access
1 Citations
2,698 Views
10 Pages

26 June 2022

Most quantum gravity theories quantize space-time on the order of Planck length (ℓp ). Some of these theories, such as loop quantum gravity (LQG), predict that this discreetness could be manifested through Lorentz invariance violations (LI...

  • Feature Paper
  • Article
  • Open Access
10 Citations
12,330 Views
20 Pages

11 December 2023

It has been shown that the theory of relativity can be applied physically to the functioning brain, so that the brain connectome should be considered as a four-dimensional spacetime entity curved by brain activity, just as gravity curves the four-dim...

  • Article
  • Open Access
16 Citations
5,031 Views
16 Pages

Ion Conduction and Its Activation in Hydrated Solid Polyelectrolyte Complexes

  • Souvik De,
  • Annika Ostendorf,
  • Monika Schönhoff and
  • Cornelia Cramer

25 October 2017

For the first time, temperature-dependent conductivities at constant water content for a series of solid polyelectrolyte complexes with varying mixing ratios of anionic poly(sodium 4-styrene sulfonate) and poly(diallyldimethylammonium chloride) are p...

  • Concept Paper
  • Open Access
7 Citations
6,302 Views
22 Pages

25 January 2022

Following Smolin, we proceed to unification of general relativity and quantum theory by operating solely with events, i.e., without appealing to physical systems and space-time. The universe is modelled as a dendrogram (finite tree) expressing the hi...

  • Feature Paper
  • Article
  • Open Access
6 Citations
14,343 Views
26 Pages

30 November 2024

We present the Quantum Memory Matrix (QMM) hypothesis, which addresses the longstanding Black Hole Information Paradox rooted in the apparent conflict between Quantum Mechanics (QM) and General Relativity (GR). This paradox raises the question of how...

  • Article
  • Open Access
21 Citations
3,623 Views
16 Pages

Is the Devil in h?

  • Andrei Khrennikov

19 May 2021

This note is a part of my effort to rid quantum mechanics (QM) nonlocality. Quantum nonlocality is a two faced Janus: one face is a genuine quantum mechanical nonlocality (defined by the Lüders’ projection postulate). Another face is the nonlocality...

  • Article
  • Open Access
3 Citations
2,849 Views
15 Pages

20 November 2019

Due to the current extent of arid regions, the pressure on available water resources is increasing. A suitable measure for water availability and dynamics in dry soil is the relative humidity of the soil air. Due to the heterogeneity of soil, water i...

  • Article
  • Open Access
13 Citations
7,762 Views
17 Pages

9 January 2015

The 14 moments model for dense gases, introduced in the last few years by Arima, Taniguchi, Ruggeri and Sugiyama, is here extended up to 18 moments. They have found the closure of the balance equations up to a finite order with respect to equilibrium...

  • Article
  • Open Access
7 Citations
6,476 Views
29 Pages

Beyond Causal Explanation: Einstein’s Principle Not Reichenbach’s

  • Michael Silberstein,
  • William Mark Stuckey and
  • Timothy McDevitt

16 January 2021

Our account provides a local, realist and fully non-causal principle explanation for EPR correlations, contextuality, no-signalling, and the Tsirelson bound. Indeed, the account herein is fully consistent with the causal structure of Minkowski spacet...

  • Article
  • Open Access
2 Citations
1,784 Views
13 Pages

26 February 2023

In axistationary, asymptotically flat spacetimes, zero angular momentum observers (ZAMOs) define an absolute standard of non-rotation locally, as can be verified by the absence of any Sagnac effect for these observers. Nevertheless, we argue that on...

  • Article
  • Open Access
6 Citations
2,654 Views
20 Pages

On Possible Minimal Length Deformation of Metric Tensor, Levi-Civita Connection, and the Riemann Curvature Tensor

  • Fady Tarek Farouk,
  • Abdel Nasser Tawfik,
  • Fawzy Salah Tarabia and
  • Muhammad Maher

9 October 2023

The minimal length conjecture is merged with a generalized quantum uncertainty formula, where we identify the minimal uncertainty in a particle’s position as the minimal measurable length scale. Thus, we obtain a quantum-induced deformation par...

  • Article
  • Open Access
4 Citations
6,759 Views
13 Pages

Relative Entropy Derivative Bounds

  • Pablo Zegers,
  • Alexis Fuentes and
  • Carlos Alarcón

23 July 2013

We show that the derivative of the relative entropy with respect to its parameters is lower and upper bounded. We characterize the conditions under which this derivative can reach zero. We use these results to explain when the minimum relative entrop...

  • Article
  • Open Access
14 Citations
4,644 Views
17 Pages

26 July 2021

Monitoring calibration bias in reflectivity (ZH) in an operational S-band dual-polarization weather radar is the primary requisite for monitoring and prediction (nowcasting) of severe weather and routine weather forecasting using a weather radar netw...

  • Review
  • Open Access
51 Citations
7,498 Views
19 Pages

An alternative approach to Einstein’s theory of General Relativity (GR) is reviewed, which is motivated by a range of serious theoretical issues inflicting the theory, such as the cosmological constant problem, presence of non-Machian solutions, prob...

  • Article
  • Open Access
7 Citations
2,806 Views
16 Pages

Equivalence Principle in Classical and Quantum Gravity

  • Nikola Paunković and
  • Marko Vojinović

12 November 2022

We give a general overview of various flavours of the equivalence principle in classical and quantum physics, with special emphasis on the so-called weak equivalence principle, and contrast its validity in mechanics versus field theory. We also discu...

  • Article
  • Open Access
2 Citations
1,879 Views
12 Pages

5 July 2023

First-principle total energy calculations were performed to investigate the atomic structures and relative stabilities of two low miller-index surfaces of pyrochlore Y2Zr2O7. The stoichiometric Y2Zr2O7 (110) and (100) surfaces were predicted, with lo...

  • Article
  • Open Access
2 Citations
1,801 Views
15 Pages

22 October 2024

The relative energetic stability, mechanical properties, and thermodynamic behavior of B2-AlRE (RE = Sc, Y, La-Lu) second phases in Al alloys have been investigated through the integration of first-principles calculations with the quasi-harmonic appr...

  • Article
  • Open Access
6 Citations
2,889 Views
17 Pages

3 November 2022

The main barrier to the publication of observational research is a perceived inferiority to randomised designs with regard to the reliability of their conclusions. This commentary addresses this issue and makes a set of recommendations. It analyses t...

  • Article
  • Open Access
5 Citations
3,046 Views
20 Pages

19 August 2020

It is generally accepted that the Copenhagen interpretation is inapplicable to quantum cosmology, by contrast with the many worlds interpretation. I shall demonstrate that the two basic principles of the Copenhagen interpretation, the principle of wh...

  • Review
  • Open Access
26 Citations
12,998 Views
11 Pages

Foundational Statistical Principles in Medical Research: A Tutorial on Odds Ratios, Relative Risk, Absolute Risk, and Number Needed to Treat

  • Thomas F. Monaghan,
  • Syed N. Rahman,
  • Christina W. Agudelo,
  • Alan J. Wein,
  • Jason M. Lazar,
  • Karel Everaert and
  • Roger R. Dmochowski

Evidence-based medicine is predicated on the integration of best available research evidence with clinical expertise and patient values to inform care. In medical research, several distinct measures are commonly used to describe the associations betw...

  • Communication
  • Open Access
2 Citations
3,014 Views
8 Pages

The Possibility of a Non-Lagrangian Theory of Gravity

  • Celia Escamilla-Rivera and
  • Júlio C. Fabris

General Relativity resembles a very elegant crystal glass: If we touch its principles, that is, its Lagrangian, there is a risk of breaking everything. Or, if we will, it is like a short blanket: Curing some problems creates new problems. This paper...

  • Article
  • Open Access
20 Citations
2,511 Views
10 Pages

Selected Aspects of Using the Telemetry Method in Synthesis of RelNav System for Air Traffic Control

  • Milan Džunda,
  • Natália Kotianová,
  • Peter Dzurovčin,
  • Stanislav Szabo,
  • Edina Jenčová,
  • Iveta Vajdová,
  • Peter Koščák,
  • Dorota Liptáková and
  • Peter Hanák

Accuracy is an important factor in air traffic management which is why high requirements are necessary for each navigation system. The aim of this article is to describe the principles of the RelNav system and telemetry and their accuracy. We present...

  • Article
  • Open Access
4 Citations
3,295 Views
15 Pages

8 June 2021

In order to explore novel light-weight Co-Nb-based superalloys with excellent performance, we studied the effects of alloying elements including Sc, Ti, V, Cr, Mn, Fe, Ni, Y, Zr, Mo, Tc, Ru, Rh, Pd, Hf, Ta, W, Re, Os, Ir and Pt on the structural stab...

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