martes, 9 de junio de 2009

ASTRONOMY DATABASE-AD Servicio de Notificacion Personal

Dado que me interesan especificamente estos temas cosmologicos : La Edad del Universo ,la Composicion del Universo y la Materia y Energia Oscuras ,que constituyen en estos momentos los puntos de mas concentracion de busqueda ,voy a incluir mensualmente la lista de trabajos cientificos que tratan del tema.

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for Jorge Poveda
Tue Jun 9 00:48:50 2009
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POVEDA, JORGE - Citations: 0 (total 51)
No recent citations found in Astronomy


2009A&G....50c...4K: Kardashev: News and Views: Parallax measurements on cosmological scales RESEARCH NOTES The prospect of advanced astrometric satellites raises the tantalizing possibility that we will be able to make astrometric measurements at such a precision as to place constraints on dark energy parameters. That is the premise outlined by Fiona Ding and Rupert Croft of Carnegie Mellon University, Pittsburgh, USA, in Monthly Notices of the Royal Astronomical Society, Establishing the cosmological distance scale has long been a goal of astrophysics. Parallax measurements and simple geometry were used to establish the distance of nearby objects, taking measurements at different times when the Earth was at different positions in its orbit around the Sun. The same principle applies to, say, quasars, if we could measure distances with sufficient precision. And precision data at cosmological distances would feed into estimates of dark energy parameters. Kardashev suggested in 1986 that Earth's position with respect to the cosmic microwave background would be a good framework for such parallax measurements. Ding and Croft have established that our movement relative to the CMB would be sufficient, over 10 years, to be useful. Based on published estimates of instrument performance, they calculate that a 10-year-long Gaia mission observing around a million quasars could measure the Hubble constant to within 25km s-1Mpc-1. Gaia has a nominal five-year lifetime, so even this prospect, as the authors say, ``may be too optimistic''. However, Ding and Croft go on to outline mission concepts along the lines of NASA's Terrestrial Planet Finder, that could incorporate this technique. They stress that, while such measurements are beyond the capabilities of current instruments, ``there appear to be no obvious astrophysical sources of systematic error on these measurements'' - unlike all other proposed probes of dark energy. There are statistical errors, and there may be unthought-of errors, but these could be explored while Gaia is working, for example. All in all, the authors make a case for exploring these possibilities, making the best use of resources to provide valuable independent measurements not available by other means. Ding and Croft's work will be published in MNRAS in June. Reference: Kardashev 1986
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1998AJ....116.1009R: Riess,+: Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
1999ApJ...517..565P: Perlmutter,+: Measurements of Omega and Lambda from 42 High-Redshift Supernovae
2004ApJ...607..665R: Riess,+: Type Ia Supernova Discoveries at z > 1 from the Hubble Space Telescope: Evidence for Past Deceleration and Constraints on Dark Energy Evolution
1989RvMP...61....1W: Weinberg: The cosmological constant problem
2003PhR...380..235P: Padmanabhan: Cosmological constant-the weight of the vacuum

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