Galileon scalar electrodynamics

Kushwaha, Ashu; Shankaranarayanan, S.

doi:10.1103/physrevd.101.065008

Cited by 7 publications

(8 citation statements)

References 31 publications

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“…Due to such enhancement, the theoretical predictions of net baryonic density seems to be consistent with the observational constraints, and thus the model provides a natural explanation of BAU. Here we would like to mention that the baryogenesis from helical magnetic fields with curvature couplings have been proposed earlier, however in quite different contexts [92]. It may be noted that in our present analysis, we include the higher curvature Gauss-Bonnet coupling in the set-up and also discuss the possible effects of the reheating phase in the production of helical magnetic field and consequently in the baryogenesis, which makes the present model essentially different from earlier ones.…”

Section: Introductionmentioning

confidence: 80%

“…Non-trivial dynamics of axion field produces helical magnetic field which finally leads to the baryon asymmetry of the universe [48]. Recently, the baryogenesis has been addressed from the production of helical magnetic fields, where the electromagnetic field gets coupled with the background Riemann tensor by the dual field tensor [92]. Such coupling between the electromagnetic field and the Riemann tensor gives rise to helical nature of magnetic field, which in turn leads to a net baryonic number density as of the order n B /s 0 ∼ 10 −10 , that is consistent with the cosmic microwave background (CMB) observations (where n B is the net baryonic number density and s 0 is the entropy density of the present universe).…”

Section: Introductionmentioning

confidence: 99%

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Inflationary magnetogenesis with reheating phase from higher curvature coupling

Bamba

Elizalde

Odintsov

et al. 2021

J. Cosmol. Astropart. Phys.

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We investigate the generation of helical magnetic fields and address the baryon asymmetry of the universe from an inflationary magnetogenesis scenario, in which the conformal and parity symmetries of the electromagnetic field are broken through its coupling the Ricci scalar and the Gauss-Bonnet invariant via the dual field tensor, so that the generated magnetic field can have a helical nature. It is demonstrated that if a reheating phase with non-zero e-fold numbers following inflation is taken into account, the energy density of the magnetic fields as well as their helicity spectrum evolve differently compared to those for the instantaneous reheating case. As a result, it is shown that in presence of the reheating phase, both the field strength of the generated magnetic fields and the resultant baryon asymmetry of the universe can be compatible with the observations. Furthermore, we find a viable constraint on the reheating equation of state parameter ω eff from the data of the cosmic microwave background radiation as 0.284 ω eff 0.2975, which is consistent with a negligible Schwinger backreaction.

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Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Inflationary magnetogenesis with reheating phase from higher curvature coupling

Bamba

Elizalde

Odintsov

et al. 2021

J. Cosmol. Astropart. Phys.

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show abstract

“…It will be interesting to extend the analysis to Gluons and study the effects on the asymmetry generated in quarks and the Baryons. It is particularly important, and a study on this is currently in progress to acquire more stringent constraints on the parameters M and T RH [51].…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Helical magnetic fields from Riemann coupling

Kushwaha

Shankaranarayanan

2020

Phys. Rev. D

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The spectrum of energy density fluctuations, baryon asymmetry, and coherent large-scale magnetic fields are the three observables that provide crucial information on physics at very high energies. Inflation can only provide a mechanism to explain the density perturbations, and the origin of primordial magnetic fields and baryon asymmetry require physics beyond the standard models of cosmology and particle physics. In this work, we show that the mechanism that leads to primordial helical fields also leads to baryogenesis at the beginning of the radiation-dominated epoch. The model we consider here consists of mass dimension 6 operators that include Riemann coupling between gravity and electromagnetic field without extending the Standard Model of particle physics. We explicitly show that the generation of helical magnetic fields leads to baryogenesis.We further show that the model predicts the observed amount of baryon asymmetry of the Universe for a range of reheating temperatures consistent with the observations.

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“…The cross-collision of artificial intelligence and art has attracted considerable attention in technical fields and artistic fields. Various image processing software and filter applications developed based on the above technologies have attracted numerous users once they were launched (Shrivakshan and Chandrasekar, 2012;Dutta et al, 2013;Desai et al, 2020). The core of all kinds of wonders is the image style transfer based on deep learning.…”

Section: Image Style Transfer Based On Deep Learningmentioning

confidence: 99%

Application of Deep Learning Algorithms to Visual Communication Courses

Wang

et al. 2021

Front. Psychol.

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There are rare studies on the combination of visual communication courses and image style transfer. Nevertheless, such a combination can make students understand the difference in perception brought by image styles more vividly. Therefore, a collaborative application is reported here combining visual communication courses and image style transfer. First, the visual communication courses are sorted out to obtain the relationship between them and image style transfer. Then, a style transfer method based on deep learning is designed, and a fast transfer network is introduced. Moreover, the image rendering is accelerated by separating training and execution. Besides, a fast style conversion network is constructed based on TensorFlow, and a style model is obtained after training. Finally, six types of images are selected from the Google Gallery for the conversion of image style, including landscape images, architectural images, character images, animal images, cartoon images, and hand-painted images. The style transfer method achieves excellent effects on the whole image besides the part hard to be rendered. Furthermore, the increase in iterations of the image style transfer network alleviates lack of image content and image style. The image style transfer method reported here can quickly transmit image style in less than 1 s and realize real-time image style transmission. Besides, this method effectively improves the stylization effect and image quality during the image style conversion. The proposed style transfer system can increase students’ understanding of different artistic styles in visual communication courses, thereby improving the learning efficiency of students.

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Galileon scalar electrodynamics

Cited by 7 publications

References 31 publications

Inflationary magnetogenesis with reheating phase from higher curvature coupling

Inflationary magnetogenesis with reheating phase from higher curvature coupling

Helical magnetic fields from Riemann coupling

Application of Deep Learning Algorithms to Visual Communication Courses

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