Metastable Phases and Superconductors Produced by Plasma-Jet Spraying

Moss, Marvin; Smith, Douglas L.; Lefever, R. A.

doi:10.1063/1.1723612

Cited by 80 publications

(29 citation statements)

References 5 publications

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“…Duwez et al (1960) realized this possibility by reporting achievement of complete solid solubility in Cu-Ag and GaSb-Ge systems and formation of new nonequilibrium intermediate phases in Ag-Ge and Au-Si, being noncrystalline for the latter and the first metallic glass formed by RQM to be identified as such. Further developments (Kaufmann andMuller, 1964, 1965) involved cross-blast gas jet spraying onto a rotating disk for uranium and zirconium alloys, and concurrently Moss et al (1964) reported using plasma spray deposition to form a new superconducting phase in Mo-Ru, in addition to the new phase in Ag-Ge. Another version spread the droplets on the inside of a rotating metal cylinder.…”

Section: Historical Surveymentioning

confidence: 99%

Experimental Methods in Rapid Quenching from the Melt

Jones

1981

Ultrarapid Quenching of Liquid Alloys

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Section: Historical Surveymentioning

confidence: 99%

Experimental Methods in Rapid Quenching from the Melt

Jones

1981

Ultrarapid Quenching of Liquid Alloys

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“…But, if inflation happens at the Grand Unification scale, i.e. 10 15 − 10 16 GeV, and we suppose that only one part in 10 20 of the inflation's potential energy density is changed into radiation, the resulting temperature of the Universe will be on the order of 10 11 GeV. The triumph of the Big Bang nucleosynthesis is based on the fact that the reheating temperature after inflation should be below 10 9 GeV.…”

Section: Introductionmentioning

confidence: 99%

“…One important difference between warm inflation and the usual cold inflation is the primordial fluctuations that are necessary for large scale structures (LSSs) formation. These initial fluctuations for cold inflation are due to quantum effects, while in warm inflation, the thermal fluctuations have an essential role for the formation of LSSs [16][17][18][19][20]. Inflationary paradigm not only solve the conceptual problems of the standard Big Bang cosmology, but also provides the explanation for the origin of LSSs of the Universe [21].…”

Section: Introductionmentioning

confidence: 99%

Trans-Planckian effects in warm inflation

Nezhad

Shojai

2019

J. Cosmol. Astropart. Phys.

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We study the effect of a non-trivial vacuum prescription on warm inflation observables, namely the power spectrum of the comoving curvature perturbation. Non-trivial choice of vacuum, can provide information about trans-Planckian physics. Traditionally, the initial condition for inflation is chosen to be the usual Bunch-Davies vacuum. Another more reasonable choice of vacuum is the so-called α-vacua. Because the duration of inflation is not infinite, as it is assumed in the Bunch-Davies case, imposing the initial condition at infinite past is not sensible and one must utilize another vacuum prescription. In this paper, working in the slow-roll regime during warm inflation, the initial condition for inflaton fluctuations is imposed at finite past, i.e. the α-vacua. We show that this non-trivial vacuum prescription results in oscillatory correction to the comoving curvature power spectrum, which is scale dependent both in amplitude and frequency. Having obtained this scale dependent power spectrum, we consider its late time footprints and compare our results with observational data and other proposed models for the comoving curvature power spectrum.

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“…In cold inflation, it is generally considered that inflation produced seeds that give rise to the large-scale structure and the observed little anisotropy of the cosmological microwave background (CMB) through the vacuum fluctuations of inflaton field [8][9][10][11]. However, the seeds are no longer generated via quantum fluctuations in warm inflation but are dominated by the larger thermal fluctuations [5,12,13]. These have their origin in the hot radiation and influence the inflaton through a thermal noise term ξ(x, t) in the equation of motion.…”

Section: Introductionmentioning

confidence: 99%

Perturbation spectra in the warmk-inflation

Peng

Zhang

et al. 2018

Phys. Rev. D

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We investigate the cosmological perturbation theory and calculate the perturbation spectra in the warm kinflation. Unlike the scalar perturbations of k-inflation in the cold inflationary scenario, entropy perturbations should be considered in our model. We study how the entropy perturbations affect the evolution of curvature perturbation R on the comoving hypersurfaces and find the dissipation coefficient Γ plays a central role in the entropy perturbations and the evolution equation of R. In the weak dissipation condition, entropy perturbations on the large scale can be neglected such that the primordial spectrum of cosmological perturbations is due only to adiabatic perturbations. Like general warm inflationary models, density fluctuations also mainly originated from the thermal fluctuations of the inflaton field rather than the vacuum fluctuations in our model. Finally, we calculate the perturbation spectra and the tensor-to-scalar ratio, then find the tensor-to-scalar ratio is smaller than that in the k-inflation or the general potential-driven cold inflationary models.

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Metastable Phases and Superconductors Produced by Plasma-Jet Spraying

Cited by 80 publications

References 5 publications

Experimental Methods in Rapid Quenching from the Melt

Experimental Methods in Rapid Quenching from the Melt

Trans-Planckian effects in warm inflation

Perturbation spectra in the warmk-inflation

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