structure formation


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structure formation

The formation of large-scale structure such as galaxies, clusters of galaxies, etc. in the Universe. Most theories of structure formation are based on the Jeans instability in the context of general relativity theory, with the large-scale structure emerging from the inhomogeneity of matter in the Universe. It is thought that quantum fluctuations in the early Universe were responsible for the necessary inhomogeneities, with inflation expanding these fluctuations. Evidence that this theory is correct comes from the small variations in the cosmic microwave background radiation found by COBE. At present none of the detailed quantitative theories of structure formation can be regarded as definitive. One of the difficulties is that the nature of dark matter is not known.
References in periodicals archive ?
The primary tools for researching cosmic structure formation are simulations [4], which astrophysicists use to study how matter clusters in the Universe by gravitational aggregations.
This ability to watch molecules evolve their geometrical structure in real time removes the great uncertainties associated with only being able to see the initial and final stages of structure formation and having to rely on complex numerical models.
Recently, Davis (2011) described rostrum development and structure formation in S.
The freeze casting process is highly reproducible, giving the opportunity to control structure formation by simply tuning the freezing rates and solid fractions of the slurry.
Objective: "TimeProSAMAT aims to introduce concepts to program the time domain of self-assembled systems and materials in CLOSED systems under non-equilibrium conditions by controlling the kinetics of assembly and disassembly pathways via (i) modulating the surrounding by feedback systems, (ii) dissipative structure formation and (iii) active structural feedback.
Electrically conductive polymers are used in OLEDs, for example, which can also be manufactured on flexible substrates," said Tobias Kraus, head of the research group Structure Formation at INM.
The theoretical models characterise the intended model of grain structure formation due to melting and solidification of the weld.
So for molecular structure formation of final product [1a-1d] obtained from interaction of 2- pyrazolyn-5-ones with the hydroxyl benzaldehydes is certain.
Further, it would be interesting to investigate the influence of the formation of the percolative 'network-like' structure formation of MWNTs in the respective PA6/ABS blends with unmodified and modified MWNTs through electrical conductivity measurements.
Astronomers in the West ascribed to a so-called bottom-up theory of structure formation.
A set of nearest-neighbor parameters for predicting the enthalpy change of RNA secondary structure formation.
Surveying some of the directions research is moving, he discusses Higgs, neutrino, grand unification theories, the basics and phenomenology of supersymmetry, extra dimension, axion, the big bang universe, cosmological structure formation, dark matter, and dark energy.

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