Effects of magnetohydrodynamics matter density fluctuations on the solar neutrino resonant spin-flavor precession

Taking into account the stringent limits from helioseismology observations on possible matter density fluctuations described by magnetohydrodynamics theory, we find the corresponding time variations of solar neutrino survival probability due to the resonant spin-flavor precession phenomenon with amplitude of order O(10%). We discuss the physics potential of high statistics real time experiments, like as Superkamiokande, to observe the effects of such magnetohydrodynamics fluctuations on their data. We conclude that these observations could be thought as a test of the resonant spin-flavor precession solution to the solar neutrino anomaly.Comment: 16 pages, 3 figure

Twisting Magnetic Field And Multiple Resonance Mechanism In The Solar Neutrino Problem

The magnetic moment solution to the solar neutrino problem is investigated in the context of a solar magnetic field with varying phase velocity on the transverse plane. This phase velocity is assumed to successively take values which are approximately proportional to the solar density, giving rise to the appearance of many resonances along the neutrino trajectory. We obtain a magnetic moment necessary for a neutrino reduction compatible with the experimental situation in the range (6-7)×10-13μB, an improvement by a factor of 4-6 relative to the one resonance case under the same field conditions. © 1993.31701/02/15125129Lim, Marciano, (1988) Phys. Rev. D, 37, p. 1368Akhmedov, (1988) Phys. Lett. B, 213, p. 64Balantekin, Hatchell, Loreti, (1990) Phys. Rev. D, 41, p. 3583Pulido, (1992) Phys. Rep., 211, p. 167IFM preprint 19/92, to be publishedBahcall, Ulrich, (1988) Rev. Mod. Phys., 60, p. 297Bahcall, Pinsonneault, (1992) Rev. Mod. Phys., 64, p. 885Davis, (1990) Proc. XXI Cosmic ray Conf., 7, p. 155. , Adelaide, AustraliaAbazov, (1991) Phys. Rev. Lett, 67, p. 3332Hirata, (1991) Phys. Rev. D, 44, p. 2241Anselman, (1991) Phys. Lett. B, 281, p. 376Anselman, (1991) Phys. Lett. B, 281, p. 390Voloshin, Vysotskii, Okun, (1986) Sov. J. Nucl. Phys., 44, p. 440Voloshin, Vysotskii, (1986) Sov. J. Nucl. Phys., 44, p. 544Fujikawa, Shrock, (1980) Phys. Rev. Lett., 45, p. 963Marciano, Parsa, Electroweak Tests of the Standard Model (1986) Annual Review of Nuclear and Particle Science, 36, p. 171Krakauer, (1990) Phys. Lett. B, 252, p. 177. , see alsoWolfenstein, (1978) Phys. Rev. D, 17, p. 2369Wolfenstein, Neutrino oscillations and stellar collapse (1979) Physical Review D, 20, p. 2364Mikheyev, Smirnov, (1985) Sov. J. Nucl. Phys., 42, p. 913Rosen, Gelb, (1986) Phys. Rev. D, 34, p. 969Wudka, Vidal, (1988) UCD-88-40, , University of California preprintAneziris, Schechter, NEUTRINO “SPIN ROTATION” IN A TWISTING MAGNETIC FIELD (1991) International Journal of Modern Physics A, 6, p. 2375Vidal, Wudka, (1990) Phys. Lett. B, 249, p. 473Smirnov, (1991) Phys. Lett. B, 260, p. 161Toshev, (1991) Phys. Lett. B, 271, p. 179Akhmedov, Bychuk, (1989) Sov. Phys. JETP, 68, p. 250IFM preprint 19/92, to be publishedBabu, Mohapatra, Rothstein, (1991) Phys. Rev. D, 44, p. 2265see also E.Kh. Akhmedov, A. Lanza and S.T. Petcov, SISSA preprint 172/92/EP (1992)Mourão, Pulido, Ralston, The neutrino electromagnetic moments and charge radius confront Kamiokande II and Homestake experimental results (1992) Physics Letters B, 285, p. 36

Does the galaxy correlation length increase with the sample depth?

We have analyzed the behavior of the correlation length, $r_0$, as a function of the sample depth by extracting from the CfA2 redshift survey volume--limited samples out to increasing distances. For a fractal distribution, the value of $r_0$ would increase with the volume occupied by the sample. We find no linear increase for the CfA2 samples of the sort that would be expected if the Universe preserved its small scale fractal character out to the distances considered (60--100\hmpc). The results instead show a roughly constant value for $r_0$ as a function of the size of the sample, with small fluctuations due to local inhomogeneities and luminosity segregation. Thus the fractal picture can safely be discarded.Comment: Accepted for publication in ApJ

Advancements in Laparoscopic Partial Nephrectomy: Expanding the Feasibility of Nephron-Sparing

Partial nephrectomy (PN) offers equivalent oncologic outcomes to radical nephrectomy (RN) but has greater preservation of renal function and less risk of chronic kidney disease and cardiovascular disease. Laparoscopic PN remains underutilized likely because it is a technically challenging operation with higher rates of perioperative complications compared to open PN and laparoscopic RN. A review of the latest PN literature demonstrates that recent advancements in laparoscopic approaches, imaging modalities, ischemic mitigating strategies, renorrhaphy techniques, and hemostatic agents will likely allow greater utilization of LPN and expand its usage to increasingly more complex tumors