Collected Material 1
ICRAnet and ICRA 3^rd Italian-Sino Workshop on Relativistic Astrophysics July 10 -20 2006, Pescara, Italy
XVIII · Pescara · June 10-20, 2006
3rd Italian-Sino Workshop on Relativistic Astrophysics
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Participants
Participants Italian Chinese The 3rd Italian-Sino Workshop on Relativistic Astrophysics focuses on the newest developments of understanding supernova, gamma ray bursts and cosmology. It includes theories and models of supernova, gamma ray bursts, dark matter, dark energy, and dark ages, as well as observational cosmology of supernovas and 21 cm emission at high redshifts.
Scientific Program
The 3^rd Italian-Sino Workshop on Cosmology and Relativistic Astrophysics 10 - 20 July 2006, Pescara, Italy program Mon, 10 July 2006, reception Tue, 11 July 2006, Morning Session, Chair Person : She-Sheng Xue 9:30 - 9:50 Opening Address (Prof. Remo Ruffini and Prof. Fang Li-Zhi) 9:50 - 10:40 Remo Ruffini Black Hole Physics and Gamma Ray Bursts 10:40 - 11:00 Coffee Break 11:00 - 11:40 Fang, Li-Zhi Stories of SN 1006 in Chinese literatures 11:40 - 12:30 Zheng, Wei In Search for Extremely Young Galaxies with "Cosmic Lens" 12:30 - 15:00 Lunch Afternoon Session, Chair Person : V. Belinski 15:00 - 15:45 Donato Bini Frenet-Serret formalism for null world lines 15:45 - 16:30 Nakia Carlevaro Viscosity effects on gravitational collapse Wed, 12 July 2006, Morning Session, Chair Person : Lee Da-Shin 9:30 - 10:15 V. Gurzadyan Relevant vacuum modes, dark energy and observations 10:15 - 11:00 G.V. Vereshchagin Hidden invariance in Gurzadyan-Xue cosmological models 11:00 - 11:20 Coffee Break 11:20 - 12:10 Lee, Wolung Quantum noise and a low cosmic microwave background quadrupole 12:10 - 15:00 Lunch Afternoon Session, Chair Person : Deng, Zugan 15:00 - 15:45 Marco Valerio Battisti Quantum Cosmology: Evolutionary Quantum Dynamics and Generalized Uncertainty Principle 15:45 - 16:30 Riccardo Berini Influence of a vector field on Mixmaster dynamics Thu, 13 July 2006 Morning Session, Chair Person : G.V. Vereshchagin 9:30 - 10:15 V. Belinski Equilibrium confgurations of two charged masses in General Relativity 10:15 - 11:00 Lee Da-Shin Boundary induced quantum fluctuation effects: From moving mirror to electron coherence 11:00 - 11:20 Coffee Break 11:20 - 12:10 Chen. Xuelei Constrain the dark matter property with cosmic ionization history 12:10 - 15:00 Lunch Afternoon Session: Chair Person : Zheng, Wei 15:00-15.45 Zhang, Tong-Jie X-ray emission of baryonic gas in the universe: Luminosity-temperature relationship and soft-band background 15:45 - 16:30 Li-Zhi Fang nonlinear evolution of cosmic baryon fuild Fri, 14 July 2006 Evening social dinner Mon, 17 July 2006 Morning Session, Chair Person : V. Gurzadyan 9:30 - 10:15 Chu, Yao-Quan The Scientific Prospect and Project Progress of ...
Committees
Chinese committee Prof. Fang, Li-Zhi (co-Chair) University of Arizona, USA Prof. Feng, Long-Long Purple Mountain Observatory, Nanjing Prof. She-Sheng, Xue ICRAnet, Pescara, Italy Italian committee Prof. Remo RuffinI (co-Chair) ICRAnet, ICRA (International Center for Relativistic Astrophysics) and Rome University "La Sapienza"
dept of phys
3rd Sino-Italian Workshop on Relativistic Astrophysics List of Italian participants Nakia Carlevaro I.C.R.A.Net- International Center for Relativistic Astrophysics Network, University of Rome "La Sapienza" Title: Viscosity effects on gravitational collapse Authors: Nakia Carlevaro, Giovanni Montani Speaker: Nakia Carlevaro Abstract: We analyze the effects induced by the bulk viscosity on the dynamics associated to the extreme gravitational collapse. Aim of the work is to investigate whether the presence of viscous corrections to the evolution of a collapsing gas cloud influence the top-down fragmentation process. To this end, we generalize the approach presented by C. Hunter to include in the dynamics of the (uniform and spherically symmetric) cloud the negative pressure contribution associated to the bulk viscosity phenomenology. Within the framework of a Newtonian approach, we extend to the viscous case either the Lagrangian, either the Eulerian motion of the system and we treat the asymptotic evolution in correspondence to a viscosity coefficient of the form $\zeta=\zeta_0\rho^{5/6}$ ($\rho$ being the cloud density and $\zeta_0=const.$). We show how the adiabatic-like behavior of the gas is deeply influenced by viscous correction when its collapse reaches the extreme regime toward the singularity. In fact, for sufficiently large viscous contributions, density contrasts associated to a given scale of the fragmentation process acquire, asymptotically, a vanishing behavior which prevents the formation of sub-structures. Since in the non-dissipative case density contrasts diverge, we can conclude that in the adiabatic-like collapse the top down mechanism of structures formation is suppressed as soon as enough strong viscous effects are taken into account. Such a feature is not present in the isothermal-like collapse because the sub-structures formation is yet present and outlines the same behavior as in the non-viscous case. We emphasize that in the adiabatic-like collapse the bulk viscosity is also responsible for the appearance of a threshold scale beyond which perturbations begin to increase; this issue, absent in the non-viscous ...
Chinese participants
List of Chinese participants 1. Chen. Xuelei (陈学雷) National Astronomical Observatories Chinese Academy of Sciences A20 Datun Road, Chaoyang Beijing 100012 P.R.China Email: xuelei@bao.ac.cn Fax:86-10-64850103 Title of talk: Constrain the dark matter property with cosmic ionization history Abstract: The cosmic ionization history provides a useful tool to constrain the decay and annihilations of dark matter particles. Even a small fraction of dark matter particles decayed or annihilated during the cosmic dark age can provide sufficient energy to affect the ionization state of the baryonic gas. The ionization history of the Universe can be probed by CMB observations. Using current CMB data, we obtain constraint on the decay and annihilation rate of dark matter particles. 2. Chu, Yao-Quan (褚耀泉) Center for Astrophysics University of Science and Technology of China 96 Jinzai Lu Hefei, Anhui 230026 P.R.China Email: yqchu@ustc.edu.cn Fax: 86-551-3631760 Title of talk: The Scientific Prospect and Project Progress of the LAMOST Abstract: focal length of 20-meter and a field of view of 5-degree. Using active optics technique to control its reflecting corrector makes LAMOST a unique astronomical instrument in combining a large aperture with a wide field of view. The available large focal plane of 1.75-meter in diameter may accommodate up to 4000 fibers, by which the collected light of distant and faint celestial objects is fed into the spectrographs, promising a very high spectrum acquiring rate of several ten-thousands of spectra per night. The telescope will be located at the Xinglong Station of Beijing Astronomical Observatory, Chinese Academy of Sciences, as a national facility open to the whole astronomical community. The spectroscopic survey carried out by LAMOST of tens of millions of galaxies and others will make substantial contribution to the study of extra-galactic astrophysics and cosmology, such as galaxies, quasars and the large-scale structure of the universe. Its spectroscopic survey of large number of stars will make substantial contribution to the study of stellar astrophysics and the ...