An eternal universe

Novello, M.; Heintzmann, H.

doi:10.1007/bf00769626

Cited by 13 publications

(9 citation statements)

References 4 publications

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“…The Lagrangian of such a theory contains the three U(1) gauge-invariant scalars R ikmn F ik F mn , R ik g mn F im F kn and RF mn F mn with coefficients proportional to the square of the Compton wavelength of the electron. Subsequently, a non-minimal coupling of gravity and electromagnetism has been discussed by a number of authors in different settings [8,9,10,11,12,13,14,15,16,17,18]. Non-minimally extended theories were used as a framework to discuss potential limitations of the equivalence principle [19,20,21]).…”

Section: Introductionmentioning

confidence: 99%

Anisotropic cosmological models with nonminimally coupled magnetic field

Balakin

Zimdahl

2005

Phys. Rev. D

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Motivated by the structure of one-loop vacuum polarization effects in curved spacetime we discuss a non-minimal extension of the EinsteinMaxwell equations. This formalism is applied to Bianchi I models with magnetic field. We obtain several exact solutions of the non-minimal system including those which describe an isotropization process. We show that there are inflationary solutions in which the cosmological constant is determined by the non-minimal coupling parameters. Furthermore, we find an isotropic de Sitter solution characterized by a "screening" of the magnetic field as a consequence of the non-minimal coupling.

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Section: Introductionmentioning

confidence: 99%

Anisotropic cosmological models with nonminimally coupled magnetic field

Balakin

Zimdahl

2005

Phys. Rev. D

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“…Now comes the question: is it possible to generalize the interaction between these two fields for a non-minimal coupling in which the curvature tensor appears in the interacting term with the electromagnetic field in such a way that the theory remains invariant under R(α)? The answer is yes and the corresponding interacting Lagrangian is provided by [2,3]…”

Section: Duality Rotation In Minimal and Nonminimal Couplingsmentioning

confidence: 99%

A New Bifurcation in the Universe

Hartmann¹,

Novello²

2020

Unravelling Complexity

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We show that the combined system of general relativity with a non minimally coupled electromagnetic field presents a bifurcation in a cosmical framework driven by a cosmological constant. In the same framework we show the existence of states such that the resulting combined energy (the sum of the minimally and the non minimally coupled energy momentum tensor of the electromagnetic field) vanishes in a sort of violation of the action-reaction principle.

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“…It should be immediately clear that the inflationary scenarios have great relevance for the entire problem of existence of life in the universe. As an illustration, in a conclusion to their highly technical paper on some aspects of inflation, Novello and Heintzmann (1984) write:…”

Section: Stationary Multiverse?mentioning

confidence: 99%

The anthropic principle and the duration of the cosmological past

Ćirković

2004

Astronomical & Astrophysical Transactions

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The place of an anthropic argument in the discrimination between various cosmological models is to be reconsidered following the classic criticisms of Paul C. W. Davies and Frank J. Tipler. Different versions of the anthropic argument against cosmologies involving an infinite series of past events are analysed and applied to several instructive instances. This not only is of historical significance but also presents an important topic for the future of cosmological research if some of the contemporary inflationary models, particularly Linde's chaotic inflation, turn out to be correct. Cognitive importance of the anthropic principle(s) to the issue of extraterrestrial intelligent observers is reconsidered in this light and several related problems facing cosmologies with past temporal infinities are also clearly defined. This issue not only is a clear example of the epistemological significance of the anthropic principle but also has consequences for such diverse topics as the search for extraterrestrial intelligence, epistemological status of cosmological concepts, theory of observation selection effects, and history of modern astronomy.

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An eternal universe

Cited by 13 publications

References 4 publications

Anisotropic cosmological models with nonminimally coupled magnetic field

Anisotropic cosmological models with nonminimally coupled magnetic field

A New Bifurcation in the Universe

The anthropic principle and the duration of the cosmological past

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