Approximate black hole binary spacetime via asymptotic matching

We construct a fully analytic, general relativistic, nonspinning black hole binary spacetime that approximately solves the vacuum Einstein equations everywhere in space and time for black holes sufficiently well separated. The metric is constructed by asymptotically matching perturbed Schwarzschild metrics near each black hole to a two-body post-Newtonian metric far from them, and a two-body post-Minkowskian metric farther still. Asymptotic matching is done without linearizing about a particular time slice, and thus it is valid dynamically and for all times, provided the binary is sufficiently well separated. This approximate global metric can be used for long dynamical evolutions of relativistic magnetohydrodynamical, circumbinary disks around inspiraling supermassive black holes to study a variety of phenomena.Comment: 17 pages, 8 figures, 1 table. Appendix added to match published versio

Gambaran Peresepan Digoksin Pada Pasien Gagal Jantung Yang Dirawat Jalan Di RSUP Dr. Kariadi Semarang

ABSTRACKBackground Heart failure is a clinical syndrome caused by abnormalitiesof cardiac structure or function. The prevalence of heart failure is increasing andcaused loss of quality of life. Heart failure treatment guidelines has beenprepared to guide medical treatment and doctors in providing treatmentrecommendations. There are various classes of drugs used in the treatment ofheart failure, one of which is digoxin. Nowadays it has been discovered that notall heart failure patients should be given digoxin.Aim To know wether the prescripction of digoxin in heart failure outpatientof dr. Kariadi Semarang Central Hospital is in conformity with the guidelines forthe treatment of heart failure that used Internationally.Methods This was a descriptive study. Research data were the medicalrecords of outpatient heart failure patients who received digoxin therapy in dr.Kariadi Semarang Central Hospital in January 2011 to December 2011 andcomplemented by the data of ECG and echocardiography. Data were collectedwith a total sampling method. In this study, the administration of digoxin followedheart failure guidelines issued by the European Society of Cardiology (ESC) andAmerican Heart Association (AHA), the heart failure patients with atrialfibrillation (AF) or patients with sinus rhythm but with left ventricle ejectionfraction (LVEF) ≤ 40%. Digoxin was indicated for heart failure patients with AFor patients with sinus rhythm but with the left ventricular ejection fraction (LVEF)≤ 40%Results There were 121 patients who received digoxin therapy, 74 patients(61,2%) received digoxin therapy with proper indications. The reason forprescribing digoxin were atrial fibrillation (n = 18, 14.9%), LVEF ≤40% (n = 21,17.4%), or both (n = 35, 28.9%). Forty six patients (38.0%) received digoxintherapy,without proper indications.Conclusion There were 61,2% patients who received digoxin therapy withapropriate indication and 38,8% patients with inappropriate indications

Perturbative effects of spinning black holes with applications to recoil velocities

Recently, we proposed an enhancement of the Regge-Wheeler-Zerilli formalism for first-order perturbations about a Schwarzschild background that includes first-order corrections due to the background black-hole spin. Using this formalism, we investigate gravitational wave recoil effects from a spinning black-hole binary system analytically. This allows us to better understand the origin of the large recoils observed in full numerical simulation of spinning black hole binaries.Comment: Proceedings of Theory Meets Data Analysis at Comparable and Extreme Mass Ratios (NRDA/Capra 2010), Perimeter Institute, June 2010 - 12 page

Testing minimal lepton flavor violation with extra vector-like leptons at the LHC

Models of minimal lepton flavor violation where the seesaw scale is higher than the relevant flavor scale predict that all lepton flavor violation is proportional to the charged lepton Yukawa matrix. If extra vector-like leptons are within the reach of the LHC, it will be possible to test the resulting predictions in ATLAS/CMS.Comment: 19 pages, 8 figure

Study of Conformally Flat Initial Data for Highly Spinning Black Holes and their Early Evolutions

We study conformally-flat initial data for an arbitrary number of spinning black holes with exact analytic solutions to the momentum constraints constructed from a linear combination of the classical Bowen-York and conformal Kerr extrinsic curvatures. The solution leading to the largest intrinsic spin, relative to the ADM mass of the spacetime epsilon_S=S/M^2_{ADM}, is a superposition with relative weights of Lambda=0.783 for conformal Kerr and (1-Lambda)=0.217 for Bowen-York. In addition, we measure the spin relative to the initial horizon mass M_{H_0}, and find that the quantity chi=S/M_{H_0}^2 reaches a maximum of \chi^{max}=0.9856 for Lambda=0.753. After equilibration, the final black-hole spin should lie in the interval 0.9324<chi_{final}<0.9856. We perform full numerical evolutions to compute the energy radiated and the final horizon mass and spin. We find that the black hole settles to a final spin of chi_{final}^{max}=0.935 when Lambda=0.783. We also study the evolution of the apparent horizon structure of this "maximal" black hole in detail.Comment: 9 pages, 8 figure

Correlation Differences in Heartbeat Fluctuations During Rest and Exercise

We study the heartbeat activity of healthy individuals at rest and during exercise. We focus on correlation properties of the intervals formed by successive peaks in the pulse wave and find significant scaling differences between rest and exercise. For exercise the interval series is anticorrelated at short time scales and correlated at intermediate time scales, while for rest we observe the opposite crossover pattern -- from strong correlations in the short-time regime to weaker correlations at larger scales. We suggest a physiologically motivated stochastic scenario to explain the scaling differences between rest and exercise and the observed crossover patterns.Comment: 4 pages, 4 figure

Magnitude and Sign Correlations in Heartbeat Fluctuations

We propose an approach for analyzing signals with long-range correlations by decomposing the signal increment series into magnitude and sign series and analyzing their scaling properties. We show that signals with identical long-range correlations can exhibit different time organization for the magnitude and sign. We find that the magnitude series relates to the nonlinear properties of the original time series, while the sign series relates to the linear properties. We apply our approach to the heartbeat interval series and find that the magnitude series is long-range correlated, while the sign series is anticorrelated and that both magnitude and sign series may have clinical applications.Comment: 4 pages,late