g9/2isobaric analogue resonances in the56Fe(p,γ)57Co reaction

Fodor, I; Sziklai, J.; Kardon, B.; Rao, Jun; Beckert, K.; Herrmann, F.; Schobbert, H.

doi:10.1088/0305-4616/4/7/016

Cited by 17 publications

(7 citation statements)

References 7 publications

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“…This includes effects due to the temperature dependence of the effective number of relativistic degrees of freedom g * (and of the analogous quantity defined via the entropy density rather than via the energy density of the radiation). Here we use the results of [47], which assumes free electroweak gauge and Higgs bosons, as appropriate for a smooth crossover electroweak transition [48][49][50]. Moreover, it uses results from lattice QCD around the QCD transition temperature, matched to a hadron resonance gas at lower temperatures [51,52].…”

Section: Introductionmentioning

confidence: 99%

Dark matter production in an early matter dominated era

Drees¹,

Hajkarim²

2018

J. Cosmol. Astropart. Phys.

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We investigate dark matter (DM) production in an early matter dominated era where a heavy long-lived particle decays to radiation and DM. In addition to DM annihilation into and thermal DM production from radiation, we include direct DM production from the decay of the long-lived particle. In contrast to earlier treatments the temperature dependence of the number of degrees of freedom g * in the Standard Model (SM) plasma is treated carefully. Besides the well-known cases of thermal hot and cold DM, additional regions of parameter space with the approximately correct DM relic density appear. In some of these regions the temperature dependence of g * can change the final DM density by several hundred percent. Furthermore, we analyze the effect of allowing nonvanishing initial abundances for radiation and DM. We find an upper bound on the mass of the long-lived particle if the DM annihilation cross section is below that corresponding to thermal WIMP (Weakly Interactive Massive Particle) DM in standard cosmology.

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Section: Introductionmentioning

confidence: 99%

Dark matter production in an early matter dominated era

Drees¹,

Hajkarim²

2018

J. Cosmol. Astropart. Phys.

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“…Some information on resonances in this energy range will be the subject of a future publication [11]. Using our value AEc=8,876+6keV, Fodor et al [12] have identified resonances at Ep=3,728 and 3,735keV in the 56Fe(p,y)STCo reaction as the split analogue of the 2,454 keV level in 57Fe.…”

Section: Analogue State Identificationmentioning

confidence: 81%

Excited levels and isobaric analogue states in57Co

El-Kateb

Griffiths

1981

Z Physik A

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“…Numerical evolution -Though multi-oscillator solutions never collapse to form black holes, they can be unstable. Indeed, solutions such as boson stars [8,41,54,55] and oscillatons [7,56] form a subset of the multi-oscillator family and are known to be unstable to black hole formation for sufficiently large energies. In a sense, these unstable solutions would constitute regions of the islands of stability that are locally measure zero.…”

Section: Arxiv:190802296v1 [Hep-th] 6 Aug 2019mentioning

confidence: 99%

New islands of stability with double-trace deformations

Masachs

Way

2019

Phys. Rev. D

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We assess the role of a resonant spectrum in the AdS instability, and quantify the extent to which breaking the resonant spectrum of AdS can restore stability. Specifically, we study non-collapsing 'multi-oscillator' solutions in AdS under various boundary conditions that allow for both resonant and non-resonant spectra. We find non-collapsing two mode, equal amplitude solutions in the nonresonant Robin case, and that these solutions vanish in the fully resonant Dirichlet case. This is consistent with non-resonant stability, and with the idea that stable solutions in the Dirichlet case are all single-mode dominated. Surprisingly, when the boundary condition is Neumann, we find non-collapsing solutions arbitrarily close to AdS that are not single-mode dominated, despite the spectrum being fully resonant.

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g_9/2isobaric analogue resonances in the⁵⁶Fe(p,γ)⁵⁷Co reaction

Cited by 17 publications

References 7 publications

Dark matter production in an early matter dominated era

Dark matter production in an early matter dominated era

Excited levels and isobaric analogue states in57Co

New islands of stability with double-trace deformations

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