High-spin states and possible “stapler” band in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">In</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>115</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

Chen, Z. Q.; Wang, S. Y.; Liu, L.; Zhang, P.; Jia, Hui; Qi, B.; Wang, S.; Sun, D. P.; Liu, C.; Li, Z. Q.; Wu, X. G.; Li, G. S.; He, C. Y.; Zheng, Y.; Zhu, Lihua

doi:10.1103/physrevc.91.044303

Cited by 18 publications

(18 citation statements)

References 34 publications

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“…This feature is more like the closing of a stapler; thus the observed magnetic dipole band was named as "stapler band". For the stapler band in 115 In, the electric rotation of a nearly oblate core was found to play a more dominant role than the magnetic rotation [16], whereas for the one in 75 As, the valence nucleons in highj orbitals rather than the core are responsible for the closing of the stapler of angular momentum [17].…”

Section: Introductionmentioning

confidence: 92%

“…The magnetic rotation and electric rotation represent two extreme cases that can be well distinguished. Recently an angular momentum generating mechanism called "stapler" mechanism, which is a variant of the shears mechanism, was proposed for 115 In [16] and 75 As [17] based on the angular momentum analyses by the tilted axis cranking covariant density functional theory (TAC-CDFT) [14]. In the stapler mechanism, only the neutron (proton) angular momentum moves obviously toward the direction of the total angular momentum while the proton (neutron) angular momentum is almost motionless.…”

Section: Introductionmentioning

confidence: 99%

“…So far, only four stapler bands have been suggested, in 57 Mn [18], 75 As [17], 115 In [16], and 144 Tb [19]. It is worthwhile to explore more examples of stapler bands in different mass regions and to better understand the interplay between the magnetic rotation and electric rotation.…”

Section: Introductionmentioning

confidence: 99%

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“Stapler” mechanism for a dipole band in Se79

Li¹,

Chen²,

Zhang³

et al. 2019

Phys. Rev. C

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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“Stapler” mechanism for a dipole band in Se79

Li¹,

Chen²,

Zhang³

et al. 2019

Phys. Rev. C

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“…Note here that in this paper we do not adopt the H(z) data compilation from the measurement of clustering of galaxies or quasars (simply called the "clustering" method). The main reason is that some authors have questioned that these data are not totally modelindependent and thus cannot be adopted in cosmological parameter constraints [89][90][91][92][93][94][95][96][97][98]. In addition, in this paper we also use the 4 data from BAO observation, which is overlapping with the H(z) data from the "clustering" method.…”

Section: Current H(z) Datamentioning

confidence: 99%

Revisit of constraints on dark energy with Hubble parameter measurements including future redshift drift observations

Liu

Guo

Zhang

et al. 2019

J. Cosmol. Astropart. Phys.

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We investigate whether the current Hubble parameter H(z) measurements could help improve the constraints on dark energy on the basis of the mainstream cosmological probes including the type Ia supernovae (SN) observation, the cosmic microwave background anisotropies (CMB) observation, and the baryon acoustic oscillations (BAO) observation. For the current H(z) data, we use 30 data points measured by using a differential age method. Furthermore, we also consider the future H(z) measurements based on the Sandage-Loeb (SL) test by means of the E-ELT in construction, and thus we also use 30 simulated H(z) data according to a 10-year SL test observation. In this work, we choose four typical dark energy models as examples, i.e., the ΛCDM model, the wCDM model, the αDE model, and the GCG model, to complete the analysis. We find that, when only the current H(z) data are added, the constraints on these models are not improved compared to the cases using the SN+CMB+BAO data; but when further adding the 10-year SL test data, the constraint results are tremendously improved for all the four models. Therefore, we conclude that, although the current H(z) measurements could not provide an evident improvement on the basis of the current mainstream cosmological probes, the future H(z) measurements from the SL test would have enormous potential to change the status of the Hubble parameter measurements in constraining dark energy.1 This is true for the measurements of the redshift drift with the European Extremely Large Telescope (E-ELT) by observing the Lyman-α absorption lines of quasars. We note here that observations at z < 1 will likely be realized by the Square Kilometre Array (SKA) [53,54] or 21 cm experiments such as CHIME [55]. SKA will measure the redshift drift through the observations of neutral hydrogen (HI) emission signal of galaxies at two different epochs to a precision of one percent in the range of 0 < z < 1 (for the SKA Phase 2 array) [53,54]. Thus, actually, E-ELT and SKA ideally complement each other because the E-ELT probes the deep matter era and the SKA probes the acceleration era. However, in this work, we only focus on the redshift drift measurements by the E-ELT, because our aim is to discuss how the high-redshift H(z) measurements help break the parameter degeneracies formed by the low-redshift observations.

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“…which in the last few years has received a lot of attention in the literature [32][33][34][35][36][37]. The constants α and m are two coupling constants with the former being dimensionfull and the latter dimensionless.…”

Section: A the Power Law F (R)mentioning

confidence: 99%

Cosmological production of black holes: A way to constrain alternative theories of gravity

2018

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Primordial black holes are considered to be pair created quantum-mechanically during inflation. In the context of General Relativity (GR), it has been shown that the pair creation rate is exponentially decreasing during inflation. Specifically, tiny black holes are favored in the early universe, but they can grow with the horizon scale, as inflation approaches its end. At the same time, cosmological, and not only, shortcomings of GR have triggered the pursuit for a new, alternative theory of gravity. In this paper, by using probability amplitudes from the No Boundary Proposal (NBP), we argue that any alternative gravity should have a black hole creation rate similar to that of GR; that is, in the early universe the creation of small black holes is in favor, while in the late universe larger black holes are being exponentially suppressed. As an example, we apply this argument in f (R)-theories of gravity and derive a general formula for the rate in any f (R)-theory with constant curvature. Finally, we consider well known f (R)-models and using this formula we put constraints on their free parameters. I. INTRODUCTIONAccording to the concordance model in cosmology, ΛCDM, the universe is endowed with a positive cosmological constant, which has a current value of Λ ≃ 1.11 × 10 −52 m −2 ≃ 2.9 × 10 −122 in reduced Planck units [1]. However, it is expected that, in the beginning of the universe, and especially during inflation, it started out large enough and since then decreases, until its current value. In addition, the models of inflation predict cosmic density perturbations, as well as quantum fluctuations of the field, responsible for the inflation, which lead to topological changes of the spacetime and these respectively to the creation of primordial black hole pairs. Primordial black holes (PBHs) are theoretical objects with masses smaller than the solar mass down to the Planck mass. These objects are unlikely to form from the gravitational collapse of a star today, since low-mass black holes can form only if matter is compressed to enormously high densities by very large external pressures [2]. Such conditions of high temperatures and pressures can be found in the early stages of a violent universe and, thus, it is believed that PBHs may have been produced plentiful back then. Proposals for their formation have been addressed over the years, such as the collapse of primordial inhomogeneities [3], cosmological phase transitions [4,5] and close domain walls [6].Apart from the procedure of the spontaneous formation of black hole pairs, there should exist a force which would pull them apart, in order not to fall back together and annihilate. In our scenario, we assume that the cosmological constant plays the role of this force, and because of the rapid cosmological expansion in the early universe, the created black hole pair remains separate.During the nineties, the study of black hole pair creation in different backgrounds was of much interest [7][8][9][10][11][12][13][14][15]. Important results have been obtained c...

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High-spin states and possible “stapler” band inIn115

Cited by 18 publications

References 34 publications

“Stapler” mechanism for a dipole band in Se79

“Stapler” mechanism for a dipole band in Se79

Revisit of constraints on dark energy with Hubble parameter measurements including future redshift drift observations

Cosmological production of black holes: A way to constrain alternative theories of gravity

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