Symmetry characterization of the collective modes of the phase diagram of the ν=0\nu=0 quantum Hall state in graphene: Mean-field and spontaneously broken symmetries

We devote this work to the study of the mean-field phase diagram of the $\nu=0$ quantum Hall state in bilayer graphene and the computation of the corresponding neutral collective modes, extending the results of recent works in the literature. Specifically, we provide a detailed classification of the complete orbital-valley-spin structure of the collective modes and show that phase transitions are characterized by singlet modes in orbital pseudospin, which are independent of the Coulomb strength and suffer strong many-body corrections from short-range interactions at low momentum. We describe the symmetry breaking mechanism for phase transitions in terms of the valley-spin structure of the Goldstone modes. For the remaining phase boundaries, we prove that the associated exact $SO(5)$ symmetry existing at zero Zeeman energy and interlayer voltage survives as a weaker mean-field symmetry of the Hartree-Fock equations. We extend the previous results for bilayer graphene to the monolayer scenario. Finally, we show that taking into account Landau level mixing through screening does not modify the physical picture explained above.Comment: 44 pages, 10 figure

Violation of Cauchy-Schwarz inequalities by spontaneous Hawking radiation in resonant boson structures

The violation of a classical Cauchy-Schwarz (CS) inequality is identified as an unequivocal signature of spontaneous Hawking radiation in sonic black holes. This violation can be particularly large near the peaks in the radiation spectrum emitted from a resonant boson structure forming a sonic horizon. As a function of the frequency-dependent Hawking radiation intensity, we analyze the degree of CS violation and the maximum violation temperature for a double barrier structure separating two regions of subsonic and supersonic condensate flow. We also consider the case where the resonant sonic horizon is produced by a space-dependent contact interaction. In some cases, CS violation can be observed by direct atom counting in a time-of-flight experiment. We show that near the conventional zero-frequency radiation peak, the decisive CS violation cannot occur.Comment: 10 pages, 6 figure

Measuring the muon's anomalous magnetic moment to 0.14 ppm

The anomalous magnetic moment (g-2) of the muon was measured with a precision of 0.54 ppm in Experiment 821 at Brookhaven National Laboratory. A difference of 3.2 standard deviations between this experimental value and the prediction of the Standard Model has persisted since 2004; in spite of considerable experimental and theoretical effort, there is no consistent explanation for this difference. This comparison hints at physics beyond the Standard Model, but it also imposes strong constraints on those possibilities, which include supersymmetry and extra dimensions. The collaboration is preparing to relocate the experiment to Fermilab to continue towards a proposed precision of 0.14 ppm. This will require 20 times more recorded decays than in the previous measurement, with corresponding improvements in the systematic uncertainties. We describe the theoretical developments and the experimental upgrades that provide a compelling motivation for the new measurement.Comment: 5 pages, 1 figure, presented at International Nuclear Physics Conference 2010 (INPC 2010

Pengaruh Pelat Penyerap Ganda Model Gelombang dengan Penambahan Reflector terhadap Kinerja Solar Water Heater Sederhana

Telah banyak dilakukan USAha meningkatkan kinerja solar water heater diantaranya modifikasi pelat penyerap tunggal menjadi ganda, modifikasi aliran untuk meningkatkan penyerapan panas, modifikasi material dan pelat penyerap ganda model gelombang. Penelitian ini bertujuan untuk mengetahui pengaruh pelat penyerap ganda model gelombang dengan penambahan reflector terhadap kinerja solar water heater sederhana. Dalam penelitian ini dilakukan secara eksperimen, untuk embandingkan kinerja pelat penyerap ganda model gelombang dengan penambahan reflektor yang hasilnya dibandingkan dengan penelitian sebelumnya (Farid dan Ismail, 2010). Kinerja yang dicari adalah efisiensi solar water heater. Hasil penelitian menunjukkan bahwa solar water heater pelat ganda dengan penambahan reflektor dapat meningkatkan efisiensi solar water heater dengan efisiensi rata-rata sebesar 24,02 %, sedangkan nilai efisiensi penyerapan panas rata-rata pada solar water heater pelat penyerap ganda model gelombang tanpa reflektor sebesar 19,81

Taaruf Phenomenon Through Marriage in Pekanbaru (Study Phenomenology in Kader Pks)

Recently, the phenomenon of taaruf marriage has become familiar in our society, especially among public figures such as artists already doing taaruf marriage. In the city of Pekanbaru wedding taaruf by Moslems also become a phenomenon in which there is an increase in terms of implementation. It can be seen from the cadre of Partai Keadilan Sejaktera (PKS) are about to get married. Taaruf wedding process does not occur in the other party cadres. This study aims to determine the motives, meanings and communication experience PKS cadres who were married through taaruf process..This study uses qualitative research with phenomenological approach. Informants in this study were five cadres who were married through taaruf process, Using a snowball sampling technique.. Data was collected techniques is done by participant observation, interview, and documentation. To achieve the validity of the data in this study, researchers used the extension of participation and triangulation.Results from this study showed that the motives of the PKS cadres. Motifs past (Because motif) form of theological motifs, basis of religion because of the theological motifs that have been ingrained in them, a commitment to build a vision of building a wedding, and believe the mediator Yag get to know potential mates. While the motive of the future (in-order to) is the desire to be happy family, mawaddah and Rohmah, cultivate relationships syari, keingianan have children pious and courtship after marriage. Making of PKS cadres do taaruf marriage is a doctrine as the implementation of Islamic Sharia, as a media partner and as an exploration of psychological needs and social control Communication experience PKS cadres do taaruf marriage is a pleasant communication experience includes; the pair know each other from time to time, received the partners family, and established cooperation with the community, while not pleasant communication experience includes; busyness couples, families and relatives of opposition parties, and the stigma of people who said marriage taaruf like buying a cat in a sack.Keyword: phenomenon, marriage taaruf, motive, meaning, communication experienceJO

Strategi Komunikasi Dalang Collection dalam Mensosialisasikan Program Bank Sampah di Kota Pekanbaru

Waste is a major environmental problem faced by governments and communities in developing countries, including Indonesia. Garbage is permaslahan that can not be left alone and need to find a solution and handled well. In addressing the garbage problem needs the involvement of all stakeholders, especially the public. One of the people who care about this waste problem is Soffia Seffen, SH by establishing Dalang Collection and establish a program that is rubbish bank. Yag efforts made to introduce this program is to socialize or communicate with the public. However, there are still many people who do not know Dalang Collection and programs. This study aims to determine how the communication strategy in disseminating Dalang Collection trash bank program in the city of Pekanbaru and determines the constraints Dalang Collection in disseminating the garbage bank program in the city of Pekanbaru.This study uses a qualitative descriptive study of strategic communication models are supported by the communication strategy according Effendy. Informants in this research is the founder, employee Dalang Collection, schools (students and teachers), residential (community), and office (employees) by using purposive sampling technique. Data collection techniques using participant observation, interview and documentation.The results showed that the socialization Dalang Collection analyzing and dividing by the target. Collection mastermind requires cognitive response, conative, and affective. Factors to be considered in designing the message: the message content, message structure and message format. Communication media used the media face to face communication (presentation) and the mass media both print and electronic media locally (RTV, Riau Pos, and the Tribune). The role of communicators in the communication attractiveness (belief, charismatic, and emapatik), and the credibility of the source (skills and knowledge) in conveying the message.Key words : Communiction strategy, socialize, bank of garbageJo