Titles and Abstracts - 2nd Galileo Xu Guangqi
 Aharonian Felix Title: Exploring galactic and extragalactic particle accelerators with X-rays, gamma-rays and neutrinos Abstract: I will discuss the potential and prospects of probing galactic and extragalactic cosmic ray accelerators using nonthermal X-rays and high energy gamma rays and neutrinos produced inside or in proximity of these accelerators. Download talk: PDF Aliev Alikram Title: Observing Black Holes: Quasi-Periodic Oscillations Abstract: Black holes continue to play a profound role in the fundamental description of nature. They occupy a central place in all theories of gravity formulated in various spacetime dimensions, shedding light into the structures and physical consequences of these theories. On the other hand, astronomical observations insistently point to the existence of black holes both in X-ray binary systems and at the centers of most galaxies, including our Milky Way Galaxy. In this talk, I will discuss the current theoretical and observational status of black holes. I will also discuss the theory of {\it Quasi-Periodic Oscillations} around black holes, some new results, challenges and open problems. Aksenov A.G. and Siutsou Ivan Title: Pair winds from compact objects with an application to GRB" Abstract: An spherically symmetrical outflowing wind or a fireball consisting of electronpositron pairs, photons, and baryons is considered. We do not assume thermal equilibrium, and include the two-body processes that occur in such plasma: Moller and Bhaba scattering of pairs, Compton scattering, two-photon pair annihilation, two-photon pair production, and pe, pp Coulomb scattering, together with their radiative three-body variants: bremsstrahlung, double Compton scattering, and three-photon pair annihilation, with their inverse processes. We solve the relativistic kinetic Boltzmann equations for distribution functions of pairs, protons, and photons numerically. By the calculating of the timescale of the thermalization we can prove the possibility of using the hydrodynamical approximation (HD). Also the purpose of our investigations is to describe the plasma correctly in all cases, and then the plasma is not in thermal equilibrium and cannot be described in the frame of HD. Download talk: PDF Amati Lorenzo Title: Measuring cosmological parameters with GRBs Abstract: Gamma-Ray Bursts (GRBs) are the brightest sources in the universe, emit mostly in the hard X-ray energy band and have been detected at redshifts up to about 8.1. Thus, they are in principle very powerful probes for cosmology. I shortly review the researches aimed to use GRBs for the measurement of cosmological parameters, which are mainly based on the correlation between spectral peak photon energy and total radiated energy or luminosity. In particular, based on an enriched sample of 115 GRBs, I will provide an update of the analysis by Amati et al. (2008) aimed at extracting information on Omega_M and, to a less extent, on Omega_Lambda, from the Ep,i - Eiso correlation. Download talk: PPT   Arkhangelskaja Irene Title: The characteristics of GRB with high energy component in their spectra Download talk: PPTX Arkhangelsky Igor Title: The application of the BrilLanCe series scintillation detector in the spectrometer of neural particles in the satellite experiment ZINA-NT Download talk: PPTX Arnett David Title: What determines the Rotational State of a Collapsing Star? Abstract: Black holes have characteristics which are determined by their mass, charge, and rotation. How are these determined in the evolution of a star which collapses to a black hole? While it is generally thought that the net charge of a star is zero, there is less agreement concerning the mass and the rotation rate. Recent efforts to clarify this issue will be summarized. Belinski Vladimir Title: Stationary Einstein-Maxwell Solitons (G.A. Alekseev and V.A. Belinski) Abstract: The new derivation of static equilibrium state for two charged masses in General Relativity is given in the framework of the Inverse Scattering Method in contradistinction to the previous derivation by the Integral Equation Method. This shows that such solution are of solitonic character and represent the particular case of the most general 12-parametric stationary solitonic solution for two rotating charged objects obtained by Alekseev in 1986. It is shown also that an analytical continuation of this solution in the space of arbitrary parameters is possible which means that applicability of the Inverse Scattering Method in presence of electromagnetic field not restricted only to the naked singularities cases. The stability (with respect to a rotation emerged) of the true equilibrium static solution recently obtained by Alekseev and Belinski is demonstrated. Belli Pierluigi Title: Particle Dark Matter in the galactic halo: results from DAMA/LIBRA Abstract: The former DAMA/NaI experiment and the present second generation DAMA/LIBRA (sensitive mass: about 250 kg highly radiopure NaI(Tl)) exploit the model independent Dark Matter annual modulation signature. Both the used target material and the model independent approach assure a wide sensitivity to many Dark Matter candidates and physical scenarios. The experiments have obtained clear evidence for the presence of Dark Matter particles in the galactic halo, with a cumulative 8.9 sigma C.L. in an exposure of 1.17 ton x year collected in 13 independent annual cycles. No other experiment is available whose result can be directly compared in a model independent way with those by DAMA/NaI and DAMA/LIBRA. Implications and perspectives will be addressed. Download talk: PDF  Bianco Carlo Luciano Title: The fireshell equations of motion and the P-GRB observational properties Abstract: Within the fireshell model, Gamma-Ray Burst (GRB) light curves are composed by two distinct phenomena: the Proper GRB (P-GRB), emitted when the fireshell becomes transparent, and the extended afterglow, emitted due to the interaction with the CircumBurst Medium (CBM) of the ultrarelativistic baryonic matter shell left over after the transparency point. The peak of the extended afterglow, together with the P-GRB, forms what is usually called the "prompt emission". Such a theoretical framework implies the existence of three GRB classes, as a function of the fireshell baryon loading and of the CBM average density: the "genuine" short GRBs, where the P-GRB is energetically predominant over the extended afterglow, the "long" GRBs, where the extended afterglow is energetically predominant over the P-GRB, and the "disguised" short GRBs, where the extended afterglow, although still energetically predominant, has a peak flux lower than the P-GRB one due to a peculiarly low value of the CBM density, typical of galactic halos. In this talk I will describe the kinematics and dynamics of the fireshell in both the optically thick and the optically thin phase, with special emphasis on the transparency point and on the observational properties of the P-GRB. Such observational properties are crucial for the identification of the P-GRB in the observed GRBs and therefore for their classification in the above recalled three classes. Download talk: PDF Bini Donato Title: Poynting-Robertson effect in black hole spacetimes Abstract: Test particles orbiting black holes with superposed a radiation field suffer for friction-like effects due to the absorbing and consequent re-emitting of radiation. There arise significant modifications to geodesic motion. Details are discussed varying orbital parameters as well as those related to the radiation field. Download talk: PDF Boer Michel Title: Rapid multi-wavelength observations of gamma-ray bursts. Abstract: With the launch of satellites able to provide timely positions, it has been possible to use robotic telescopes to observe the prompt emission and early GRB afterglow. This provides a panchromatic, dynamic view of these events, from the eV to the GeV. Observational aspects, theoretical implications and prospective will be reviewed. Download talk: PPT Boshkayev Kuantay Title: On Magnetic Fields in Neutron Stars Abstract: We consider an extremely simple model of the neutron stars that includes neutrons, protons and electrons, all treated as degenerate and mostly non-interacting fermions. The charge distribution in the entire configuration is assumed to be globally neutral. The aim of the work is to study the magnetic field induced by the charged distribution when the system is allowed to rotate with constant angular velocity around the axis of symmetry. We present the analyses in the framework of Newtonian theory of gravity and in Einstein theory of gravity. Download talk: PPT Braga Joao Title: MIRAX: a Brazilian-Italian X-Ray Astronomy Mission for GRBs and X-Ray Transients Abstract: MIRAX (Monitor e Imageador de Raios X) is an X-ray astronomy mission being developed primarily at INPE, Brazil. Its main objective is to perform wideband (2-700 keV) imaging (~5 arcmin resolution) spectroscopy of a large sample (2 sr field-of-view) of transient sources and explosive phenomena in the universe. Recently, the participation of Italian institutions, including ICRANet, was discussed and the first steps were taken toward the inclusion of Italian instruments on the MIRAX payload. In this talk I will present the current status of the mission, its main scientific objectives and the preliminary configuration of the instruments and the satellite. Download talk: PPTX  Bravetti Alessandro Title: On The Correspondence Between Extremal Black Holes and real poles in the ISM for electro-vacuum (V. Belinski, A. Bravetti and H. W. Lee) Abstract: It is shown that (unlike to some statements in the literature) the real poles in the dressing matrix of the Alekseev’s Inverse Scattering Method (ISM) for electro-vacuum does not lead to a principal difficulties but the restriction is that they correspond to the extreme objects. It is shown that solutions of Majumdar-Papapetrou, Perjes-Israel-Wilson and Parker-Ruffini-Wilkins are solitonic solutions but of different type. Interesting algebraic structure for the dressing matrix arise.  Caito Letizia Title: The class of disguised short bursts: some examples Abstract: Observations of Gamma-ray Bursts (GRBs) put forward in the recent years have revealed, with increasing evidence, that the historical classification between long and short bursts has to be revised. Within the Fireshell scenario, both short and long bursts are cononical bursts, consisting of two different phases.First, a Proper-GRB (P-GRB), that is the emission of photons at the tranparency of the fireshell. Then, the Extended Afterglow, multiwavelenght emission due to the interacion of the baryonic remnants of the fireshell with the CircumBurst Medium (CBM). We discriminate between long and short bursts by the amount of energy stored in the first phase with respect to the second one. This is given by the baryon loading parameter, that quantifies the barionic remnants engulfed by the fireshell. When 10-42s), where T90 corresponds to the time interval in which 90 % of the total fluence is received. Since most of the events are classified as "long", in the present work only objects of this class will be considered. Using a Monte Carlo technique, we have simulated mock catalogs of GRBs and compare the resulting fluence distributions in different energy bands with those derived from SWIFT data. By a best fit procedure, the parameters defining the (isotropic) energy distribution of GBRs were estimated. Pandolfi Stefania Title: Harrison-Zel'dovich primordial spectrum is consistent with observations Abstract: Inflation predicts primordial scalar perturbations with a nearly scale-invariant spectrum and a spectral index approximately unity (the Harrison--Zel'dovich (HZ) spectrum). The first important step for inflationary cosmology is to check the consistency of the HZ primordial spectrum with current observations. Recent analyses have claimed that a HZ primordial spectrum is excluded at more than 99% c.l.. Here we show that the HZ spectrum is only marginally disfavored if one considers a more general reionization scenario. Data from the Planck mission will settle the issue. Download talk: PPT  Patricelli Barbara  Title: High energetic GRBs and their spectral properties within the fireshell model Abstract: One of the main goals of the fireshell model is to reproduce the observational properties of Gamma Ray Bursts (GRBs) starting from the assumption of a spectral energy distribution of the photons in the comoving frame of the fireshell. This approach represents an attempt to identify the underlying physical process responsible for the energy emission. Each observed instantaneous spectrum is the convolution over the corresponding EquiTemporal Surface (EQTS) of thousands of comoving spectra, duly weighted by their corresponding Lorentz and Doppler factors. Within the fireshell model, for simplicity, a comoving thermal spectrum was assumed and in this way it has been possible to interpret successfully the observational properties of low energetic GRBs (bursts with an isotropic energy Eiso =10^53 ergs); nevertheless, the analysis of higher energetic bursts (Eiso =10^54 ergs) has revealed some discrepancies between the numerical simulations and the observational data. We investigate the possibility of reproducing the observed spectra and light curves of these GRBs by assuming a different comoving spectrum. In particular, we propose a phenomenologically "modified" thermal spectrum: a thermal spectrum characterized by a different asymptotic power-law index in the low energy region. We test this spectrum by comparing the numerical simulations with the observational data of several high energetic bursts: GRB 080319B, GRB 050904 and GRB 990123. Download talk: PDF  Piran Tsvi Title: Understanding the prompt emission of GRBs after Fermi Download talk: PPTX  Rosquist Kjell Title: Constraints of initial data for a discrete universe Abstract: Cosmological evolution is considered as the dynamics of a collection of discrete objects. In this approach, averaging is replaced by a mean field description in which each cosmological grain (galaxy or cluster of galaxies) is regarded as a test particle moving in the vacuum field created by all the other galaxies. Issues concerning spatial curvature and initial data in this framework will be discussed. In particular, we present evidence which may imply that spatial sections of the universe are constrained to have a spherical (and hence finite) topology. Download talk: PPT  Rotondo Michael Title: On the relativistic Thomas-Fermi treatment of compressed atoms and compressed nuclear matter cores of stellar dimensions Abstract: Using the recently established scaling laws for the solutions of the relativistic Thomas-Fermi equation we consider the two limiting cases of compressed atoms and compressed nuclear matter cores of stellar dimensions. The Feynman, Metropolis and Teller treatment of compressed atoms is extended to the relativistic regimes. Each atomic configuration is confined by a Wigner-Seitz cell and is characterized by a positive electron Fermi energy. There exists a limiting configuration with a maximum value of the electrons Fermi energy $(E_e^F)_{max}$ reached when the Wigner-Seitz cell radius equals the radius of the nucleus, and it is here expressed analytically in the ultra-relativistic approximation. The results are compared and contrasted to approximate treatments in the literature. Particular attention is given to comparing and contrasting the newly computed configurations of the electrons to the ones obtained by a uniform approximation. Attention is also given to a relativistic evaluation of the exchange Thomas-Fermi-Dirac corrections. These results are particularly significant to study the equation of state for compressed matter under astrophysical conditions. In particular it is shown how this powerful new approach leads to overcome some difficulties present in the Salpeter approximation generally adopted in physics and astrophysics. This treatment is then extrapolated to compressed nuclear matter cores of stellar dimensions with $A\simeq (m_{\rm Planck}/m_n)^3 \sim 10^{57}$ or $M_{core}\sim M_{\odot}$. Again an entire family of equilibrium configurations exist for selected values of the electron Fermi energy varying in the range $0 < E_e^F \leq (E_e^F)_{max}$. Such configurations have electric fields on the core surface, increasing for decreasing values of the electron Fermi energy reaching values much larger than the critical value $E_c = m_e^2c^3/(e\hbar)$ for $E_e^F=0$. We compare and contrast our results with the ones of Thomas-Fermi model in strange stars. Preliminary results on the magnetic fields induced by the elctric fields when the nuclear matter core of stellar dimensions is allowed to rotate with constant angular velocity around the axis of symmetry are illustrated and discussed. Download talk: PPT Ruchayskiy Oleg Title: Sterile neutrino dark matter Abstract: An extension of the Standard Model by three right-handed (sterile) neutrinos with their masses below the electroweak scale allows to explain neutrino oscillations, baryon asymmetry of the Universe, and provides a dark matter candidate. Dark matter made of sterile neutrinos can be warm, cold or mixed and satisfies all existing astrophysical and cosmological bounds. I will overview these bounds and discuss the prospects for future searches. Download talk: PDF  Rueda Hernandez Jorge and Pugliese Daniela Title: A general relativistic Thomas-Fermi treatment of neutron star cores Abstract: It is formulated the set of self-consistent ground-state equilibrium equations of a system of degenerate neutrons, protons and electrons in beta equilibrium within the framework of quantum statistics and of the general relativistic field theory for the gravitational, the electromagnetic and the hadronic fields. The hadronic interaction between nucleons is modeled by introducing the sigma, omega and rho fields within the Thomas-Fermi approximation all duly expressed in general relativity. It is demonstrated that, as in the non-interacting case, the minimization procedure of the energy of the configuration brings to the condition of the constancy of the Fermi energy of each particlespecie properly generalized to include the contribution of all fields. Consequences of the new set of the general relativistic equilibrium equations are discussed. Download talk 1: PDF and talk 2: PDF Ruffini Remo Title: Black holes in GRBs and galactic nuclei Abstract: Black Holes are observed in binary-x-ray sources and in active galactic nuclei. They are also observed during their formation phases in the process of gravitational collapse by the emission of Gamma Ray Bursts (GRBs). Both in the case of binary-x-ray sources and in the case of GRBs the progenitors of Black Holes are formed of baryonic matter. In the case of galactic nuclei an unified picture is proposed explaining at once the galactic halos and the condensation in the galactic cores as originating from dark matter Fermions semi-degenerate. Sahakyan Narek Title: On the origin of high energy gamma-rays from giant radio lobes of Centaurus A. Abstract: Recently Fermi collaboration reported the detection of high energy gamma-ray signal from giant lobes of the radiogalaxy Centaurus A. We discuss the origin of this radiation and the possible radiation mechanisms, including Inverse Compton scattering of electrons, interaction of relativistic protons with the ambient low density plasma, and synchrotron radiation of the secondary electrons produced in p-gamma interactions. Download talk: PPT Scardigli Fabio Title: Pre-inflation matter era and the CMB power spectrum Abstract: We consider the possibility of a pre-inflationary matter era induced by primordial micro black hole remnants. Effects of such epoch on the suppression of low k modes of CMB power spectrum are discussed and computed both analytically and numerically, and compared with the last observational data. Download talk: PDF  Sigismondi Costantino Title: Methods to measure the solar diameter Abstract: The solar diameter is rock-solid or not? Whatever will be the answer the methods used for its measurements are more and more challenging, and facing new astrophysical and optical problems since the space resolution required is of astrometric quality. A quick overview on different methods is here presented, as well as the problem of the solar limb definition, emerging after the spectrum flash during eclipses. Download talk: PDF  Song Doo Jong Title: SGWB by Cataclysmic Variables Abstract: "On the framework of stochastic gravitational wave background (SGWB) by close binary systems, we investigated the strain spectra of SGWB by cataclysmic variables". Vereshchagin Gregory Title: Hydrodynamics of the optically thick phase in GRBs Abstract: We study the optically thick phase of GRBs by solving numerically relativistic hydrodynamic equations. By considering various initial distributions of matter we find that during expansion plasma spatial distribution deviate from the simple "frosen radial profile" established by Piran et al. (1993). We outline the consequences of such deviations for observations of GRBs. Download talk: PDF  Vissani Francesco Title: Topics in neutrino astronomy Download talk: PDF  Wang I-Chin Title: Effects of a pre-inflation radiation-dominated epoch to CMB anisotropy Abstract: We consider that the pre-inflation era is radiation-dominated, transiting smoothly to the inflationary era. We work out in detail the dynamics of inflaton fluctuations across the phase transition and the proper choices of initial vacuum states. It is found that this phase transition can suppress long-wavelength quantum fluctuations of inflaton. This may attribute to the large-scale CMB anisotropy a lower power than predicted in the standard $\Lambda$CDM model. In constraining this transitional effect by WMAP anisotropy data, we use the WMAP best-fit scale-invariant $\Lambda$CDM model with the density power spectrum replaced by the one found in this work. We find that the transition occurs at least about $10$ e-folds before the comoving scales comparable to our present horizon size cross the Hubble radius during inflation. Wang Jian-Min Title: Episodic Random Accretion and the Cosmological Evolution of Supermassive Black Hole Spins Abstract: The growth of supermassive black holes (BHs) located at the centers of their host galaxies comes mainly from the accretion of gas, but how to fuel them remains an outstanding unsolved problem in quasar evolution. This issue can be elucidated by quantifying the radiative efficiency parameter (η) as a function of redshift, which also provides constraints on the average spin of the BHs and its possible evolution with time. We derive a formalism to link η with the luminosity density, BH mass density, and duty cycle of quasars, quantities we can estimate from existing quasars, and galaxy survey data. We find that η has a strong cosmological evolution: at z ≈ 2, η ≈ 0.3, and by z ≈ 0 it has decreased by an order of magnitude, to η ≈ 0.03. We interpret this trend as evolution in BH spin, and we appeal to episodic, random accretion as the mechanism for reducing the spin. The observation that the fraction of radio-loud quasars decreases with increasing redshift is inconsistent with the popular notion that BH spin is a critical factor for generating strong radio jets. In agreement with previous studies, we show that the derived history of BH accretion closely follows the cosmic history of star formation, consistent with other evidence that BHs and their host galaxies co-evolve. Wang Lifan Title: Dark Matter and Dark Matter Energy Studies from Antarctica Plateau Abstract: Cosmology from Antarctica Plateau The highest peak in Antarctica is unique for modern science. Recent heroic expeditions by Chinese scientists have established the site as the coldest and driest spot on earth. It is also a site of steady air that makes for clear viewing into deep space. Despite all the difficulties, Chinese scientists are determined to build a world-class astronomical observatory at Dome A, Antarctica. Astronomers have already successfully established an automated observatory at the site. Of particular interest, three new 75cm Schmidt telescopes will be installed in Dome A, Antarctica which will provide important data for studying the origins of the Universe and searching for exoplanets. Within the next decades, Dome A, Antarctica will emerge as the best astronomical observatory in the world. It will become our best hope to understand the nature of the vast Universe and a powerhouse to discover new mysterious planets harboring life outside the solar system. In this lecture, Professor Wang will introduce the Kunlun Station of Antarctica, a new platform for modern sciences. Wang Zhaozhong and Yong Jin Title: Nanotechnology for astrophysics Abstract: In the past three decades, nanotechnology has been widely developed in terms of three fields: material growth (bottom up), nanolithography (top down) and nanocharacterization. These developments have brought great progress in integrated circuits and detectors for modern electronics. In this communication, we will show that these new technologies permit us to explore a novel frontier of scientific research with new generation of electronic devices and innovative experimental methods for astrophysics. LPN/CNRS is a leading French national nanoscience and nanotechnology center with a most advanced setup for nano- and micro-devices fabrication and characterization. In the past years, LPN has been involved in different research projects in astrophysics. We are developing lowpower and ultra-low-noise transistors operating at a temperature below 4.2 K which consists of ultra-low noise HEMTs (High Electron Mobility Transistors) and fully ballistic HEMTs. These transistors will be used for deep cryogenic readouts electronics for deep cryogenic ultra-sensitive detectors, in particular, for the detection of WIMPs. More generally, these transistors can be used for deep cryogenic readouts of various high impedance deep cryogenic detectors. We develop also, submicron Schottky diodes for sub-THz and THz detection and generation. In addition of semiconductor electronic devices, the LPN involves in the development of Hot Electron Bolometer (HEB) matrix by “Observatoire de Paris” for 2.5 THz detection. Download talk: PDF  Wu, Xiang-Ping Title: 21CMA: Performance and Prospects Xia Xiaoyang Title: Molecular gas and black hole growth in infrared ultra-luminous QSOs Abstract: Based on IRAM 30m observations for 25 infrared ultra-luminous QSOs(IR QSOs) and by comparing with local ULIRGs and high-redshift (sub)mm loud QSOs, we find: 1. The molecular gas content of IR QSOs is in the same range as ULIRGs, implying that there is enough fuel for continuing star formation in the last stage of major wetmerging. 2. Although the star formation rate is high for high-redshift (sub)mm loud QSOs, they are not simple scaled up of local IR QSOs because the ratio of far-infrared luminosity to bolometric luminosity (Lfir/Lbol) is much lower than that of local IR QSOs, which may give hint that the black hole and stellar mass of galaxies grow not coevally. Xue She-Sheng and Han Wenbiao Title: Electron-positron pair oscillation in spatially inhomogeneous electric fields and radiation Abstract: It is known that strong electric fields produce electron and positron pairs from the vacuum, and due to the back-reaction these pairs oscillate back and forth coherently with the alternating electric fields in time. We study this phenomenon in spatially inhomogeneous and bound electric fields by integrating the equations of energymomentum and particle-number conservations and Maxwell equations. The space and time evolutions of the pair-induced electric field, electric charge- and current-densities are calculated. The results show that non-vanishing electric charge-density and the propagation of pair-induced electric fields, differently from the case of homogeneous and unbound electric fields. The space and time variations of pair-induced electric charges and currents emit an electromagnetic radiation. We obtain the narrow spectrum and intensity of this radiation, whose peak $\omega_{\rm peak}$ locates in the region around $5\sim 70$ KeV depending on electric field strengths. We discuss their relevances to both the laboratory experiments for electron and positron pair-productions and the astrophysical observations of compact stars with an electromagnetic structure. Download talk: PPT  Yang Xiaou Title: The evolution of galaxies: central vs satellite Abstract: Galaxies are thought to form within cold dark matter halos. Satellite galaxies were central galaxies associated with the subhalos before their accetion into the host halos. Thus by linking central galaxies with host halos and satellite galaxies with subhalos, at different redshifts, we are able to probe the evolution of galaxies for centrals and satellites separately. Download talk: PPT Zhang Shuang-Nan Title: On the nature of Z-sources: neutron star magnetic field, accretion disk structure and evolution Abstract: Using the data from the Rossi X-Ray Timing Explorer satellite, we investigate the spectral evolution along the Z- and nu-tracks on the hardness-intensity diagrams (HIDs) Z-sources, study their accretion disk structure and evolution, and infer their neutron star surface magnetic field strengths. We find that the disk accretion rate is less on the nu tracks than on the Z-tracks. Along the Z-tracks, at first the disk accretion rate increases on the upper track, and then decreases on the lower track. The disk accretion rate evolves differently on the nu-tracks. The slow variation of the disk accretion rate determines the evolution of the vertical disk structure, with the inner disk thickness proportional to the average disk accretion rate. Along the Z- or nu-tracks, the accretion disk evolves from a slim disk to a standard thin one. Their NS surface magnetic field strengths, derived from the interaction between the magnetosphere and the accretion disk, are on the order of 10^9 G. We also find that the neutron stars in transient Z-sources have surface magnetic field strengths between normal atoll and Z sources. We therefore suggest that the combination of the NS magnetic field strength and accretion rate makes a low mass NS Xray binary appear either as a Z source or an atoll source. Download talk: PDF  Zhang Ton-jie Title: Fisher Information Content In The Matter Power Spectrum By Wavelet Method Abstract: We use the code “CubeP3M” to do 141 simulations of dark matter density fields. In wavelet space, we construct a non-Gaussian filter in order to separate non- Gaussian structure, which is the result of the non-linear evolution of the universe, from the Gaussian distributions of matter. We find the non-Gaussian feature is more dominant at smaller scales, which is in accordance with the theory of structure formation of the universe. We calculate the power spectra of the Gaussianized and non-Gaussianized density fields, and find that the Gaussianized power spectra is dampened extremely on small scales compared to unfiltered ones. For the Gaussianized cumulative information, we find the plateau in the translinear regime still exists, but is higher than the unfiltered one. We conclude that the wavelet filtering of data can prevent the lose of information in the trans-linear power.

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