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Lynden-Bell & Kalnajs (1972) presented a useful formula for computing the long-range torque between spiral arms and the disk at large. The derivation uses second-order perturbation theory and assumes ...
The Assembly of Galaxies Over Cosmic Time
cosmology: observations galaxies: evolution galaxies: formation galaxies: high-redshift galaxies: stellar content galaxies: structure
2014/12/9
To Understand how galaxies were assembled across the cosmic time remains one of the most outstanding questions in astronomy. The core of this question is how today's Hubble Sequence, namely the differ...
Time dependent embedding of spherically symmetric Rindler spacetime
anisotropic cosmic fluid MS energy curved Rindler ric heat flux
2012/2/21
An anisotropic cosmic fluid with radial heat flux which sources a time dependent Rindler geometry is investigated. Even though its energy density $\rho$ is positive, the radial and transversal pressur...
Graphic solution of R-W metric for the case of positive curvature and cosmic entire space and time
R-W metric hypersphere cosmology large scale structure of the universe space and time absolutism relativism
2011/9/26
The vivid image of R-W metric for the case of hypersphere is given; The hypersphere is proposed as the only model for the physical universe; The cosmic radius R(t) may be defined as a cosmic broad tim...
Lookback time and Chandra constrains on cosmological parameters
Cosmological parameters WMAP measurements lookback time dark energy Monte Carlo Markov Chains
2011/10/19
In this paper we combine the WMAP7 with lookback time and Chandra gas fraction data to constrain the main cosmological parameters and the equation of state for the dark energy. We find that the lookba...
We present an analysis of the B-band and V-band rise-time distributions of nearby Type Ia supernovae (SNe Ia). We use a two-stretch template-fitting method to measure the rise and decline of BV light ...
Fast Molecular Hydrogen from Time-Dependent Shocks
Fast Molecular Hydrogen Time-Dependent Shocks
2009/6/15
Fast Molecular Hydrogen from Time-Dependent Shocks。
An interesting thought experiment claiming to highlight the connection
between singularities and the global arrow of time is re-analyzed, and a
further specification suggested. Against the criticism...
THE ANTHROPIC ARROW OF TIME AND REALISTIC WORLD MODELS：ON PRICE AND ATEMPORAL UNIVERSE
WORLD MODELS ATEMPORAL UNIVERSE
2009/3/13
In recent attempts at building an atemporal (”tenseless”) picture
of the physical world, insufficient attention is devoted to processes giving rise to
the cosmological arrow of time. Having regard t...
Decoherent Histories Analysis of Models without Time
Decoherent Histories Models without Time
2010/10/13
The decoherent histories approach is a particularly useful approach to quantum theory especially when time enters in a non-trivial way, or indeed, when there is no physical time coordinate at all, as ...
Although most fundamental laws are invariant under time reversal, experience exhibits the presence of irreversible phenomena – the arrows of time. Their origin lies in cosmology, and I argue that only...
Dark Energy in the Universe, the Irreversibility of Time and Neutrinos
Dark Energy the Universe Time and Neutrinos
2010/10/13
In this review, I discuss briefly how the presence of a cosmological constant in the Universe may imply a decoherent evolution of quantum matter in it, and as a consequence a fundamental irreversibili...