Penerapan Model Pembelajaran Novick Untuk Meremediasi Miskonsepsi Siswa Pada Hukum Archimedes Di SMP

The purpose of this research was to know the effectiveness of Novick learning model in remedied student\u27s misconception about Archimedes Law in VIII Grade of SMPN 2 Segedong Kabupaten Mempawah. The research method used the pre-experiment design with One Group Pretest-Posttest Design. 24 students of VIII-B Grade had followed this research activity until finished. There were 3 results was founded: the average of percentage decrease of student\u27s misconception is 32,95%; the conceptual change occured based on Mc Nemar Test (= 57.65, dk = 1, α = 5%); and the remediaton effectiveness level is middle (the average of ΔS = 0,36). Based on the result, the implementation of Novick learning model was effective on remedied student\u27s misconception. Hopefully, it can become an alternative of learning model in physics instruction

Primordial Non-Gaussianity in Models with Dark Matter Isocurvature Fluctuations

We investigate primordial non-Gaussianity and dark matter isocurvature fluctuations in the modulated reheating and the curvaton scenarios. In these scenarios, large non-Gaussianity can be generated, on the other hand, depending on how dark matter is produced, too large isocurvature fluctuations can also arise, which is inconsistent with current observations. In this paper, we study this issue in a mixed scenario where the curvature fluctuations can also be produced from the inflaton fluctuations as well as those from a light scalar field such as the modulus and the curvaton. We show that primordial fluctuations can be highly non-Gaussian without conflicting the current constraint on isocurvature fluctuations for such mixed scenarios. However, if the constraint on isocurvature fluctuations becomes severer as expected by the Planck satellite, $f_{\rm NL}$, a nonlinearity parameter for adiabatic fluctuations, should be very small as $f_{\rm NL} \lesssim 3$, which would give interesting implications for the generation mechanism of dark matter. Non-Gaussianity from isocurvature fluctuations is also discussed in these scenarios.Comment: 26 pages, 4 figures, accepted for publication in PR

Non-Gaussianity, Spectral Index and Tensor Modes in Mixed Inflaton and Curvaton Models

We study non-Gaussianity, the spectral index of primordial scalar fluctuations and tensor modes in models where fluctuations from the inflaton and the curvaton can both contribute to the present cosmic density fluctuations. Even though simple single-field inflation models generate only tiny non-Gaussianity, if we consider such a mixed scenario, large non-Gaussianity can be produced. Furthermore, we study the inflationary parameters such as the spectral index and the tensor-to-scalar ratio in this kind of models and discuss in what cases models predict the spectral index and tensor modes allowed by the current data while generating large non-Gaussianity, which may have many implications for model-buildings of the inflationary universe.Comment: 40 pages, 16 figures, discussions added, references adde

Constraints on Neutrino Masses from Weak Lensing

The weak lensing (WL) distortions of distant galaxy images are sensitive to neutrino masses by probing the suppression effect on clustering strengths of total matter in large-scale structure. We use the latest measurement of WL correlations, the CFHTLS data, to explore constraints on neutrino masses. We find that, while the WL data alone cannot place a stringent limit on neutrino masses due to parameter degeneracies, the constraint can be significantly improved when combined with other cosmological probes, the WMAP 5-year (WMAP5) data and the distance measurements of type-Ia supernovae (SNe) and baryon acoustic oscillations (BAO). The upper bounds on the sum of neutrino masses are m_tot = 1.1, 0.76 and 0.54 eV (95% CL) for WL+WMAP5, WMAP5+SNe+BAO, and WL+WMAP5+SNe+BAO, respectively, assuming a flat LCDM model with finite-mass neutrinos. In deriving these constraints, our analysis includes the non-Gaussian covariances of the WL correlation functions to properly take into account significant correlations between different angles.Comment: 16 pages, 10 figures. References added, accepted for publication in PR

Relaxing Constraints on Inflation Models with Curvaton

We consider the effects of the curvaton, late-decaying scalar condensation, to observational constraints on inflation models. From current observations of cosmic density fluctuations, severe constraints on some class of inflation models are obtained, in particular, on the chaotic inflation with higher-power monomials, the natural inflation, and the new inflation. We study how the curvaton scenario changes (and relaxes) the constraints on these models.Comment: 18 pages, 6 figure

Dark energy from primordial inflationary quantum fluctuations

We show that current cosmic acceleration can be explained by an almost massless scalar field experiencing quantum fluctuations during primordial inflation. Provided its mass does not exceed the Hubble parameter today, this field has been frozen during the cosmological ages to start dominating the universe only recently. By using supernovae data, completed with baryonic acoustic oscillations from galaxy surveys and cosmic microwave background anisotropies, we infer the energy scale of primordial inflation to be around a few TeV, which implies a negligible tensor-to-scalar ratio of the primordial fluctuations. Moreover, our model suggests that inflation lasted for an extremely long period. Dark energy could therefore be a natural consequence of cosmic inflation close to the electroweak energy scale.Comment: 5 pages, 2 figures, uses RevTeX. Physical discussion extended, misprints corrected, references added. Matches published versio

Black hole entropy for the general area spectrum

We consider the possibility that the horizon area is expressed by the general area spectrum in loop quantum gravity and calculate the black hole entropy by counting the degrees of freedom in spin-network states related to its area. Although the general area spectrum has a complex expression, we succeeded in obtaining the result that the black hole entropy is proportional to its area as in previous works where the simplified area formula has been used. This gives new values for the Barbero-Immirzi parameter ($\gamma =0.5802... \mathrm{or} 0.7847...$) which are larger than that of previous works.Comment: 5 page

Peningkatan Hasil dan Motivasi Belajar Fisika Siswa melalui Model Quantum Teaching di SMA

This classroom action research aimed to improve students' outcomes and motivation in the static fluid material through quantum teaching model. This research was conducted in two cycles to the eleventh grade of natural science major 2 (XIIPA 2) of Public Senior High School 9 Pontianak with a total of 31 students. The data were collected through the learning outcome test, learning motivation questionnaire and learning observation sheet. The results indicated that there was an improvement in students' learning outcomes from the first to the second cycle by 3,22% from 70,97% to 74,19%, while the improvement in students' learning motivation from the first to the second cycle was 2,10% from 75,40% to 77,40%. Based on the research findings, it was concluded that the quantum teaching model could improve the students' learning outcomes and motivation particularly in the static fluid material. The application of this model should be designed with the best learning media preparation so as to increase students' interest in the material