Energy in the universe
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Total Energy in the Universe: Zero-Energy Universe Hypothesis and Gravitational Contributions
Several studies suggest that the total energy of the universe may be zero, with the positive energy of matter exactly canceled by the negative energy of gravity. This idea is supported by conservation laws in cosmological models, which indicate that, when the cosmological constant is zero, the total energy remains zero regardless of the universe's spatial curvature. This provides a useful constraint for early universe models and supports theories that the universe could arise from a quantum fluctuation of the vacuum Cooperstock1995Johri1995. Calculations using the Landau-Lifshitz pseudotensor in Friedmann–Robertson–Walker (FRW) models also show that the total energy of a spatially closed or flat universe is zero at all times, and that during inflation, the vacuum energy driving expansion is drawn from the gravitational field .
Energy Conservation in an Expanding Universe
In an expanding universe, defining and conserving energy becomes complex. For particles or systems, two types of energy can be defined: one related to gravitational mass and another to inertial mass. While energy conservation can be described over short intervals, in general, neither form is strictly conserved as the universe expands. For radiation, one form of energy remains constant, while the other changes over time, linked to the Hubble redshift . Additionally, mining energy from the universe’s expansion, such as through hypothetical tethered-body experiments, raises unresolved questions about energy conservation, suggesting that energy is not conserved on cosmic scales in a homogeneous, unbounded universe .
Dark Energy: The Dominant Component of Cosmic Energy
Dark energy is now understood to make up most of the universe’s energy density and is responsible for the accelerated expansion of the universe. Observations, such as those of distant supernovae, have confirmed this acceleration, leading to the postulation of dark energy as a key force in cosmic evolution Prakash2024Deng2025Dandotia2023. Dark energy acts in opposition to gravity, stretching space and influencing the formation and distribution of galaxies and voids. Its behavior is often described by the equation of state parameter "w," which helps scientists model its effects over time . The nature of dark energy remains mysterious, with ongoing research exploring its possible connections to modifications of general relativity, extra dimensions, and new forms of matter Deng2025Dandotia2023.
Hidden and Latent Energy in the Universe
Some theories propose that the universe contains hidden or latent energy within the quantum structure of space-time. For example, the concept of a quantized space-time structure suggests that enormous amounts of energy are stored in the vacuum, potentially equivalent to the mass-energy of all matter in the universe. This "hidden global energy" is theorized to be contained within fundamental units called quantons . Other ideas discuss the latent energy of the universe becoming apparent during cosmic events, such as the birth of matter or acceleration of movement, and suggest that the quantum space environment could be a source of new technological innovations .
The Role of Dark Energy in the Universe’s Fate
Dark energy not only shapes the large-scale structure of the universe but also determines its ultimate fate. As dark energy drives the accelerated expansion, it affects how galaxies and cosmic structures evolve and may lead to a future where the universe continues to expand at an ever-increasing rate Prakash2024Deng2025Dandotia2023. The interplay between dark energy, dark matter, and black holes is complex, with each influencing the distribution and behavior of the others .
Conclusion
The energy in the universe is a complex and multifaceted topic. While some models suggest the total energy is zero due to the balance between matter and gravity, the discovery of dark energy has added a new layer of mystery. Dark energy dominates the universe’s energy budget and drives its accelerated expansion, yet its true nature remains unknown. Theoretical explorations into hidden and latent energy, as well as the quantum structure of space-time, continue to push the boundaries of our understanding of cosmic energy.
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