SU(5)×\timesU(1)X_X grand unification with minimal seesaw and Z′Z^\prime-portal dark matter

We propose a grand unified SU(5)$\times$U(1)$_X$ model, where the standard SU(5) grand unified theory is supplemented by minimal seesaw and a right-handed neutrino dark matter with an introduction of a global $Z_2$-parity. In the presence of three right-handed neutrinos (RHNs), the model is free from all gauge and mixed-gravitational anomalies. The SU(5) symmetry is broken into the Standard Model (SM) gauge group at $M_{\rm GUT} \simeq 4 \times 10^{16}$ GeV in the standard manner, while the U(1)$_X$ symmetry breaking occurs at the TeV scale, which generates the TeV-scale mass of the U(1)$_X$ gauge boson ($Z^\prime$ boson) and the three Majorana RHNs. A unique $Z_2$-odd RHN is stable and serves as the dark matter (DM) in the present Universe, while the remaining two RHNs work to generate the SM neutrino masses through the minimal seesaw. We investigate the $Z^\prime$-portal RHN DM scenario in this model context, and find that the constraints from the DM relic abundance and the search results for a $Z^\prime$ boson resonance at the Large Hadron Collider (LHC) are complementary to narrow down the allowed parameter region, which will be fully covered by the future LHC experiments (for the $Z^\prime$ boson mass $<$ 5 TeV). We also briefly discuss the successful implementation of Baryogenesis and cosmological inflation scenarios in the present model.Comment: 6 pages, 2 figures, revised plots, accepted for publication in pl

Marriage relationships among households in the mid 19th century Tama, Japan

This paper studies the formation of marriage relationships between two households in 19th century, Tama, Japan. Previous studies on marriage market or partner selection in the Japanese past tended to rely either on information from a single village in case of statistical analysis, or on collection of oral histories. By using the information from a household register that covers 35 villages, and applying the method of social network analysis, this paper goes beyond the limitation of previous studies. Our empirical results show that there was a tendency for socio-economic homogamy and endogamy (within kinship and within village) among peasants in the mid 19th century Tama, Japan.Marriage, Japan, Network, Household, Household registers

Marriage Relationships Among Households in the mid 19th Century Tama, Japan

This paper studies the formation of marriage relationships between two households in 19th century, Tama, Japan. Previous studies on marriage market or partner selection in the Japanese past tended to rely either on information from a single village in case of statistical analysis, or on collection of oral histories. By using the information from a household register that covers 35 villages, and applying the method of social network analysis, this paper goes beyond the limitation of previous studies. Our empirical results show that there was a tendency for socio-economic homogamy and endogamy (within kinship and within village) among peasants in the mid 19th century Tama, Japan.

Investigations Directed Toward the Synthesis of New Cyclopentanoids Using Optically Active Bicyclo[2.2.1]heptene Monoester

The synthetic utilization of a chiral building block obtained by the enzymatic asymmetric hydrolysis of a symmetric diester having the bicyclo[2.2.1]heptene system was investigated. Several cyclopentanoids have been synthesized in high yields in enatiomerically enriched forms with the use of simple reactions. These compounds are expected to serve as useful chiral synthons for cyclopentane-containing natural products and pharmaceuticals