Energy and the universe
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Energy and the Universe
Energy Hierarchy and Transformity in the Universe
The concept of energy hierarchy in the universe is consistent with principles observed in other scales of time and space. Energy and mass are concentrated through the self-organization of matter into galaxies, stars, and black holes. As energy transforms, it becomes more concentrated at the centers of these structures, while the energy flows decrease and the intervals between feedback pulses increase. This process is governed by the second law of thermodynamics, which dictates energy transformations at various scales . The red shift observed in distant galaxies can be attributed to the greater mass and gravity of these large-scale systems .
Conservation Laws and Zero Total Energy
The conservation laws in cosmology suggest that the total energy of the universe is zero when considering both matter and gravitational contributions. This is true irrespective of the spatial curvature, provided the cosmological constant is zero. This zero-energy hypothesis supports the idea that the universe could have originated from a quantum fluctuation of the vacuum . The Einstein-Cartan-Sciama-Kibble theory extends this by including the intrinsic angular momentum of matter, showing that the energy and momentum of the closed universe are zero, implying the existence of another form of matter with negative energy, possibly dark matter .
Dark Energy and the Cosmological Constant
Dark energy, often associated with Einstein's cosmological constant (Lambda), is a significant component of the universe's energy density. It is hypothesized to be dynamic, evolving over time, which could explain the small current value of dark energy density. This evolving nature of dark energy fits well with current cosmological observations and may leave distinctive imprints on the cosmic microwave background and mass power spectrum Popławski2013Copeland2006. The detection of dark energy is supported by various cosmological tests, although more evidence is needed to fully confirm its properties .
Gravitational Energy in the Expanding Universe
Gravitational energy plays a crucial role in the evolution of the universe. In spatially closed models, the total energy remains zero at all times. During inflation, the vacuum energy driving the accelerated expansion is drawn from the gravitational field, which is also responsible for the creation of matter in the universe. This process highlights the importance of gravitational energy as a source in certain cosmological models that allow for particle creation .
Hidden Global Energy and Quantum Theories
The zero-energy universe hypothesis posits that the positive energy of matter is exactly canceled out by the negative energy of gravity. However, new theories, such as the quantum theory of Superunification, suggest a different perspective. This theory proposes a maximum energy level of the cosmic vacuum, which is due to the quantized structure of space-time. The energy accumulated in this quantized space-time is equivalent to the mass of the entire universe, indicating a hidden global energy component .
Energy Flow and Large-Scale Transformations
The universe exhibits a vast range of energy flows and transformations, spanning electromagnetic radiation, magnetic fields, cosmic rays, gravitational energy, and more. These energy forms and their sources, such as vacuum energy, cosmic expansion, and gravitational collapse, play a significant role in the large-scale structure and evolution of the universe . Understanding these energy flows is crucial for comprehending the dynamics of the cosmos.
Conclusion
The study of energy in the universe encompasses various aspects, from the hierarchical concentration of energy in cosmic structures to the conservation laws suggesting a zero total energy. Dark energy and gravitational energy are pivotal in shaping the universe's evolution, while new quantum theories propose hidden global energy components. These insights collectively enhance our understanding of the complex and dynamic nature of the universe's energy.
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