Singularities and Cyclic Universes

Dąbrowski, Mariusz P.

doi:10.5506/aphyspolbsupp.10.415

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…The OP between 4 He and 12 C is supposed to be studied systematically. A few global OPs [7,8] have been presented based on existent experimental data. However, satisfactory ESADs have not been given for a particular projectile-target system at some energies.…”

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confidence: 99%

A Common Optical Potential for $^{4}$He+$^{12}$C at Intermediate Energies

Liyuan¹,

Yushou²,

Hou³

et al. 2016

Preprint

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A common optical potential for 4 He+ 12 C at intermediate bombarding energies, which is essential in analyzing exotic nuclei with 4 He clusters, was obtained based on the São Paulo potential (SPP). Among systematic optical potentials for 4 He+ 12 C, this potential has the merit of using a fixed imaginary part of Woods-Saxon form. By optical-model calculations, this potential reproduced the experimental elastic scattering angular distributions of 4 He+ 12 C well within the energy range of 26 A-60 A MeV. It was also applied successfully in calculations of the breakup reactions of 6 Li+ 12 C and 6 He+ 12 C with a three-body continuum discretized coupled-channels method.

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confidence: 99%

A Common Optical Potential for $^{4}$He+$^{12}$C at Intermediate Energies

Liyuan¹,

Yushou²,

Hou³

et al. 2016

Preprint

View full text Add to dashboard Cite

show abstract

mentioning

confidence: 99%

A Common Optical Potential for ⁴ He+ ¹² C at Intermediate Energies

Hu¹,

Song²,

Hou³

et al. 2016

Chinese Phys. Lett.

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A common optical potential for 4 He+ 12 C at intermediate bombarding energies, which is essential in analyzing exotic nuclei with 4 He clusters, is obtained based on the São Paulo potential. Among systematic optical potentials for 4 He+ 12 C, this potential has the merit of using a fixed imaginary part of the Woods-Saxon form. By opticalmodel calculations, this potential reproduces the experimental elastic scattering angular distributions of 4 He+ 12 C well within the energy range of 26𝐴-60𝐴 MeV. It is also applied successfully in calculations of the breakup reactions of 6 Li+ 12 C and 6 He+ 12 C with a three-body continuum discretized coupled-channel method.

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The Flux Ratio of the [OIII]λλ5007,4959 Doublet with Redshift

2022

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As a test of the time symmetry of forbidden-line emission processes, we measured the [OIII]λλ4959 and 5007 emission lines of more than 12,000 galaxies from the Sloan Digital Sky Survey DR8 to examine the [OIII]λλ4959,5007 flux ratio as a function of redshift z. Using two different approaches, we fitted each line with a Gaussian curve and rejected any spectrum not conforming to requirements of line symmetry, S/N levels, and continuum fit. We found the variance in the ratio of flux to be between 4.7 and −3.3% for 0<z<0.433 which is consistent with no change. After correcting for systematic effects of noise, we found the mean value of the [OIII]λλ4959,5007 flux ratio to be 2.98 ± 0.01 which is consistent with theory and previous studies using AGN spectra. We also used these data to estimate an upper limit on the time dependence of the fine structure constant α of Δα/α(0)<1.4×10−5 for galaxies within the same redshift range. This corresponds to |α−1dα/dt|<2×10−15 yr−1, which is also in line with previous estimates from SDSS QSO data.

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Singularities and Cyclic Universes

Abstract: The models of cyclic universes and cyclic multiverses based on the alternative gravity theories of varying constants are considered.Comment: 4 pages, no figure

Cited by 3 publications

References 16 publications

A Common Optical Potential for $^{4}$He+$^{12}$C at Intermediate Energies

A Common Optical Potential for $^{4}$He+$^{12}$C at Intermediate Energies

A Common Optical Potential for ⁴ He+ ¹² C at Intermediate Energies

The Flux Ratio of the [OIII]λλ5007,4959 Doublet with Redshift

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Singularities and Cyclic Universes

Abstract: The models of cyclic universes and cyclic multiverses based on the alternative gravity theories of varying constants are considered.Comment: 4 pages, no figure

Cited by 3 publications

References 16 publications

A Common Optical Potential for $^{4}$He+$^{12}$C at Intermediate Energies

A Common Optical Potential for $^{4}$He+$^{12}$C at Intermediate Energies

A Common Optical Potential for 4 He+ 12 C at Intermediate Energies

The Flux Ratio of the [OIII]λλ5007,4959 Doublet with Redshift

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A Common Optical Potential for ⁴ He+ ¹² C at Intermediate Energies