Walther Nernst: grandfather of dark energy?

Kragh, Helge

doi:10.1111/j.1468-4004.2012.53124.x

Cited by 3 publications

(4 citation statements)

References 17 publications

(9 reference statements)

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“…where F (4) and F(4) are two four-forms that satisfy usual Bianchi identities 17 , i.e., locally F (4) = dA (3) and F(4) = d Â(3) , and the functions σ and σ are assumed to be smooth. Note that Λ(x) and κ 2 (x) are spacetime functions whose equations of motion are, respectively,…”

Section: Local Sequesteringmentioning

confidence: 99%

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Modified Gravity Approaches to the Cosmological Constant Problem

et al. 2023

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The cosmological constant and its phenomenology remain among the greatest puzzles in theoretical physics. We review how modifications of Einstein’s general relativity could alleviate the different problems associated with it that result from the interplay of classical gravity and quantum field theory. We introduce a modern and concise language to describe the problems associated with its phenomenology, and inspect no-go theorems and their loopholes to motivate the approaches discussed here. Constrained gravity approaches exploit minimal departures from general relativity; massive gravity introduces mass to the graviton; Horndeski theories lead to the breaking of translational invariance of the vacuum; and models with extra dimensions change the symmetries of the vacuum. We also review screening mechanisms that have to be present in some of these theories if they aim to recover the success of general relativity on small scales as well. Finally, we summarize the statuses of these models in their attempts to solve the different cosmological constant problems while being able to account for current astrophysical and cosmological observations.

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Section: Local Sequesteringmentioning

confidence: 99%

“…The Lenz [15] was the first to make such a comparison (see, e.g., [16][17][18] and references therein for historical notes). Recently, there has been evidence of an early dark energy component at slightly higher energies (at the eV rather than the milli-eV scale) [45,46].…”

Section: Conflicts Of Interestmentioning

confidence: 99%

Modified Gravity Approaches to the Cosmological Constant Problem

et al. 2023

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“…And the Casimir effect discussed in the sequel of this paper may be seen as the manifestation of vacuum fluctuations when being contained within walls. Let us note at this point that different points of view coexist about the significance of vacuum fluctuations [54][55][56][57][58][59][60][61][62].…”

Section: The Puzzle Of Vacuum Energymentioning

confidence: 99%

Casimir forces

Reynaud¹,

Lambrecht²

2014

Preprint

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The present notes are organized as the lectures given at the Les Houches Summer School "Quantum Optics and Nanophotonics" in August 2013. The first section contains an introduction and a description of the current state-of-the-art for Casimir force measurements and their comparison with theory. The second and third sections are a pedagogical presentation of the main features of the theory of Casimir forces for 1-dimensional model systems and for mirrors in 3-dimensional space.

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“…I will use the term basic here.8 The concept of an ether has a long history stretching from Plato and Aristotle over Descartes's theory of gravity to the many Michelson-Morley experiments searching for a medium for the propagation of electromagnetic waves. Walter Nernst proposed that radioactive atoms are created in an ether(Kragh 2012) and Mendeleev(Mendeleev 1904) claimed that there are two chemical elements, the element X (Newtonium) and Y (Coronium) with lower atomic weights than hydrogen that make up the ether.…”

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confidence: 99%

The value of vague ideas in the development of the periodic system of chemical elements

Vogt

2021

Synthese

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The exploration of chemical periodicity over the past 250 years led to the development of the Periodic System of Elements and demonstrates the value of vague ideas that ignored early scientific anomalies and instead allowed for extended periods of normal science where new methodologies and concepts are developed. The basic chemical element provides this exploration with direction and explanation and has shown to be a central and historically adaptable concept for a theory of matter far from the reductionist frontier. This is explored in the histories of Prout's hypothesis, Döbereiner Triads, element inversions necessary when ordering chemical elements by atomic weights, and van den Broeck's ad-hoc proposal to switch to nuclear charges instead. The development of more accurate methods to determine atomic weights, Rayleigh and Ramsey's gas separation and analytical techniques, Moseley's x-ray spectroscopy to identify chemical elements, and more recent accelerator-based cold fusion methods to create new elements at the end of the Periodic Table point to the importance of methodological development complementing conceptual advances. I propose to frame the crossover from physics to chemistry not as a loss of accuracy and precision but as an increased application of vague concepts such as similarity which permit classification. This approach provides epistemic flexibility to adapt to scientific anomalies and the continued growth of chemical compound space and rejects the Procrustean philosophy of reductionist physics. Furthermore, it establishes chemistry with its explanatory and operational autonomy epitomized by the periodic system of elements as a gateway to other experimental sciences.

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Walther Nernst: grandfather of dark energy?

Cited by 3 publications

References 17 publications

Modified Gravity Approaches to the Cosmological Constant Problem

Modified Gravity Approaches to the Cosmological Constant Problem

Casimir forces

The value of vague ideas in the development of the periodic system of chemical elements

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