Right-handed neutrino dark matter in the classically conformal U(1)' extended Standard Model

We consider the dark matter (DM) scenario in the context of the classically conformal U(1)' extended standard model (SM), with three right-handed neutrinos (RHNs) and the U(1)' Higgs field. The model is free from all the U(1)' gauge and gravitational anomalies in the presence of the three RHNs. We introduce a $Z_2$-parity in the model, under which an odd-parity is assigned to one RHN, while all the other particles is assigned to be $Z_2$-even, and hence the $Z_2$-odd RHN serves as a DM candidate. In this model, the U(1)' gauge symmetry is radiatively broken through the Coleman-Weinberg mechanism, by which the electroweak symmetry breaking is triggered. There are three free parameters in our model, the U(1)' charge of the SM Higgs doublet ($x_H$), the new U(1)' gauge coupling ($g_X$), and the U(1)' gauge boson ($Z'$) mass ($m_{Z'}$), which are severely constrained in order to solve the electroweak vacuum instability problem, and satisfy the LHC Run-2 bounds from the search for $Z'$ boson resonance. In addition to these constraints, we investigate the RHN DM physics. Because of the nature of classical conformality, we find that a RHN DM pair mainly annihilates into the SM particles through the $Z'$ boson exchange. This is the so-called $Z'$-portal DM scenario. Combining the electroweak vacuum stability condition, the LHC Run-2 bounds, and the cosmological constraint from the observed DM relic density, we find that all constrains complementarily work to narrow down the allowed parameter regions, and, especially, exclude $m_{Z'} \lesssim 3.5$ TeV. For the obtained allowed regions, we calculate the spin-independent cross section of the RHN DM with nucleons. We find that the resultant cross section well below the current experimental upper bounds.Comment: 29 pages, 1 table, and 16 figures, version accepted in Phys. Rev. D. arXiv admin note: substantial text overlap with arXiv:1605.0115

Non-minimal quartic inflation in classically conformal U(1)X_X extended Standard Model

We propose quartic inflation with non-minimal gravitational coupling in the context of the classically conformal U(1)_X extension of the SM. In this model, the U(1)_X gauge symmetry is radiatively broken through the Coleman-Weinberg (CW) mechanism, by which the U(1)_X gauge boson (Z' boson) and the right-handed neutrinos (RHNs) acquire their masses. We consider their masses in the range of O(10 GeV)-O(10 TeV), which are accessible to high energy collider experiments. The radiative U(1)_X gauge symmetry breaking also generates a negative mass squared for the SM Higgs doublet, and the electroweak symmetry breaking occurs subsequently. We identify the U(1)_X Higgs field with inflaton and calculate the inflationary predictions. Due to the CW mechanism, the inflaton quartic coupling during inflation, which determines the inflationary predictions, is correlated to the U(1)_X gauge coupling. With this correlation, we investigate complementarities between the inflationary predictions and the current constraint from the Z' boson resonance search at the LHC Run-2 as well as the prospect of the search for the Z' boson and the RHNs at the future collider experiments. The radiative U(1)_X gauge symmetry breaking also generates a negative mass squared for the SM Higgs doublet, and the electroweak symmetry breaking occurs subsequently. We identify the U(1)_X Higgs field with inflaton and calculate the inflationary predictions. Due to the Coleman-Weinberg mechanism, the inflaton quartic coupling during inflation, which determines the inflationary predictions, is correlated to the U(1)_X gauge coupling. With this correlation, we investigate complementarities between the inflationary predictions and the current constraint from the Z' boson resonance search at the LHC Run-2 as well as the prospect of the search for the Z' boson and the RHNs at the future collider experiments.Comment: 21 pages, 6 figures, accepted for publication in pr

Kontroversi Ujian Nasional Sepanjang Masa

Keberadaan dan penerapan UN menuai kritik dan kontroversi apabila dikaitkan dengan UU Sisdiknas Nomor 20, Tahun 2003 tentang Sistem Pendidikan Nasional (Sisdiknas). Rangkaian butir-butir kritik itu terjalin dalam tujuh untaian pelanggaran UN yakni hanya mengukur aspek kognitif sehingga tidak dapat dijadikan standar untuk mengukur mutu pendidikan, mengabaikan diversifikasi potensi daerah dan peserta didik, merampas hak guru untuk melakukan evaluasi hasil belajar peserta didiknya, mendasarkan evaluasi pada peserta didik semata, penentuan kelulusan bukan oleh guru, pemerintah dan pemerintah daerah merampas hak pemberian ijazah kepada peserta didik setelah lulus ujian. UN hanya mengevaluasi hasil akhir proses pembelajaran secara momental dan tidak komprehensif serta mengabaikan orientasi tujuan pendidikan sehingga tidak mengindikasikan mutu pendidikan. Paparan kontroversi ini dimaksudkan untuk dimanfaatkan para pendidik dan pemerhati pendidikan guna menemukan solusi dalam rangka pembenahan kebijakan penilaian pendidikan demi peningkatan pendidikan yang berakses pada pembangunan nasional bangsa menuju bertambahnya kesejahteraan rakyat

Analysis of Enrollment Scale of Chinese Specialty Education

With the adjustment of industrial structure of China in recent years, the market urgently needs different levels of professionals. Specialty education is an important part of higher education in China, has its unique advantages. Through the analysis of the history data of specialty education in our country, the result shows that the specialty education scale has been increasing steadily. However, there are many variables and parameters influencing the enrollment scale. Based on the econometric method, four linear trend prediction models are given and compared. The results show that the accuracy of the simple linear model with lagged data is higher than that of the normal undergraduate enrollment linear model and the model with GDP variable. Keywords: specialty education, enrollment scale, linear mode

Peripheral nerve-derived VEGF promotes arterial differentiation via neuropilin 1-mediated positive feedback

In developing limb skin, peripheral nerves are required for arterial differentiation, and guide the pattern of arterial branching. In vitro experiments suggest that nerve-derived VEGF may be important for arteriogenesis, but its role in vivo remains unclear. Using a series of nerve-specific Cre lines, we show that VEGF derived from sensory neurons, motoneurons and/or Schwann cells is required for arteriogenesis in vivo. Arteriogenesis also requires endothelial expression of NRP1, an artery-specific coreceptor for VEGF^(164) that is itself induced by VEGF. Our results provide the first evidence that VEGF is necessary for arteriogenesis from a primitive capillary plexus in vivo, and show that in limb skin the nerve is indeed the principal source of this signal. They also suggest a model in which a `winner-takes-all' competition for VEGF may control arterial differentiation, with the outcome biased by a VEGF^(164)-NRP1 positive-feedback loop. Our results also demonstrate that nerve-vessel alignment is a necessary, but not sufficient, condition for nerve-induced arteriogenesis. Different mechanisms therefore probably underlie these endothelial patterning and differentiation processes