Leptogenesis bound on neutrino masses in left-right symmetric models with spontaneous D-parity violation

We study the baryogenesis via leptogenesis in a class of left-right symmetric models, in which $D$-parity is broken spontaneously. We first discuss the consequence of the spontaneous $D$-parity breaking on the neutrino masses. Than we study the lepton asymmetry in various cases, from the decay of right handed neutrino as well as the triplet Higgs, depending on their relative masses they acquire from the symmetry breaking pattern. The leptogenesis bound on their masses are discussed by taking into account the low energy neutrino oscillation data. It is shown that a TeV scale leptogenesis is viable if there are additional sources of CP violation like domain wall originating from the spontaneous $D$-parity violation.Comment: 32 pages (revtex), 12 eps figures, clarifications are added in section VII, A new section VIII is added, useful references are added. Journal version, To appear in Phys. Rev.

Kajian Perubahan Curah Hujan, Suhu dan Tipe Iklim pada Zone Ekosistem di Pulau Lombok

Dampak Perubahan iklim dapat dirasakan secara global. Pulau Lombok merupakan salah satu pulau kecil yang mempunyai tingkat kerentanan terhadap Perubahan iklim lebih besar dibandingkan pulau-pulau besar. Perubahan iklim dapat menyebabkan terganggunya ekosistem yang ada sehingga perlu adanya strategi mitigasi dan adaptasi terhadap Perubahan iklim. Data dan informasi Perubahan iklim merupakan data dasar yang penting untuk merumuskan strategi mitigasi dan adaptasi terhadap Perubahan iklim. Tujuan penelitian ini adalah mendapatkan data dan informasi Perubahan curah hujan, suhu dan tipe iklim serta menelusuri dampaknya terhadap ekosistem hutan di Pulau Lombok. Metode yang digunakan adalah analisis Perubahan iklim (besaran, Perubahan, distribusi spasial dan kecenderungan), dan analisis dampak Perubahan iklim terhadap ekosistem hutan melalui analisis kesenjangan antara data terkini dan data histori. Hasil penelitian menunjukkan bahwa di Pulau Lombok telah terjadi Perubahan iklim yang ditandai oleh Perubahan kecenderungan curah hujan, suhu dan tipe iklim. Dampak Perubahan iklim pada ekosistem hutan antara lain rusaknya ekosistem hutan mangrove, hilangnya jenis-jenis endemik, penurunan tutupan lahan, serta berkurangnya kualitas dan kuantitas mata air

Flavor origin of dark matter and its relation with leptonic nonzero θ13 and Dirac CP phase δ

We propose a minimal extension of the standard model by including a U(1) flavor symmetry to establish a correlation between the relic abundance of dark matter, measured by WMAP and PLANCK satellite experiments and non-zero value of sinθ13 observed at DOUBLE CHOOZ, Daya Bay, RENO and T2K. The flavour symmetry is allowed to be broken at a high scale to a remnant Z2 symmetry, which not only ensures the stability to the dark matter, but also gives rise to a modification to the existing A4-based tri-bimaximal neutrino mixing. This deviation in turn suggests the required non-zero value of sinθ13. We assume the dark matter to be neutral under the existing A4 symmetry while charged under the U(1) flavor symmetry. Hence in this set-up, the non-zero value of sinθ13 predicts the dark matter charge under U(1), which can be tested at various ongoing and future direct and collider dark matter search experiments. We also point out the involvement of nonzero leptonic CP phase δ, which plays an important role in the analysi

Unifying the flavor origin of dark matter with leptonic nonzero θ13

We propose a flavor symmetric approach to unify the origin of dark matter (DM) with the nonzero θ13 in the lepton sector. In this framework, the breaking of a U(1) flavor symmetry to a remnant Z2 ensures the stability of the DM and gives rise to a modification to the existing A4-based tribimaximal neutrino mixing to attain the required nonzero values of sinθ13. This results in a range of Higgs portal coupling of the DM which can be potentially accessible at various ongoing and future direct and collider search experiments

Sistem Perakaran Bidara Laut (Strychnos Lucida R.br.) Untuk Pengendalian Tanah Longsor

One of potential Non Timber Forest Products (NTFPs) in West Nusa Tenggara and Bali is Strychnos lucida R.Br. which is used for medicinal purposes. The species is also potential to use in land rehabilitation of dry land where it offers an additional benefit of landslide control. Part of the plant which has important role in landslide control is root system. Therefore this study aimed to investigate the Strychnos lucida root system in landslide control. The study was held in Bali Barat National Park. Root characteristics observed in the study were the penetration position in the soil, root architecture, and Index of Roots Anchoring (IRA) and Index of Roots Binding (IRB). The result showed that Strychnos lucida root was able to penetrate into deep soil layer and had R-tipe root architecture which can increase shear resistance of soil. Value of IRA and IRB indicated the species had a more vertical roots in every growth stage and a high enough horizontal roots. Based on its root characteristics, Strychnos lucida was able to decrease landslide risk, especially shallow and surface landslide

Tingkat Kerawanan Kebakaran Gambut Di Kabupaten Musi Banyuasin, Sumatera Selatan (Peat Fire Susceptibility in Musi Banyuasin District, South Sumatra)

Forest and land fire in 2015 was a catastrophe in Indonesia, as it did not only cause damage on forest ecosystem and environments, but also impacted human health and economic loss. This research aimed to identify hotspots distribution in 2014-2015 as an indicator of forest and land fire, and to analyze fire susceptibility in Musi Banyuasin district, South Sumatra. Data used for fire prone analysis consisted of land cover map, forest status, hotspots data derived from NOAA18, soil types, topography and moratorium map. Results showed that based on land function, hotspots were mostly found in production forest with hotspots density of 0.049 hotspots km-2. Based on land cover type, hotspots were mostly found in the open land (88 hotspots). Based on soil types, hotspots were mostly occurred on peat soils (180 hotspots and hotspot density 0.048 hotspot km-2). Soil type was mostly associated with hotspot occurrence. Sub-district of Bayung Lencir has the highest fire susceptibility among others. Low precipitation and El-Ninö phenomenon in 2015 were not the only drivers of peat fire. However two main current problems in the Forest Management Unit of Lalan Mangsang Mendis (e.g. illegal logging and open access) were driver factors of peat fire in the district