Editing Dark Energy (section)

=== Theoretical Models ===
Several theoretical models have been proposed to explain Dark Energy, though none have been confirmed by direct observation:

'''1. [[Cosmological Constant (Λ)]]:'''  
One of the simplest explanations for Dark Energy is the cosmological constant (Λ) introduced by Albert Einstein in his equations of general relativity. The cosmological constant represents a constant energy density filling space homogeneously, exerting a repulsive force that drives the acceleration of the universe’s expansion. This model suggests that Dark Energy is a fundamental property of space itself.

'''2. [[Quintessence]]:'''  
Another model proposes that Dark Energy is a dynamic field called quintessence, which varies over time and space. Unlike the cosmological constant, quintessence can evolve and interact with other components of the universe, potentially providing a more flexible explanation for the observed acceleration.

'''3. Modified Gravity Theories:'''  
Some theories suggest that the effects attributed to Dark Energy might actually be due to modifications in the laws of gravity on cosmic scales. These models propose that general relativity may need to be revised to account for the accelerated expansion, without the need for an additional energy component.

'''4. [[Dark Fluid]]:'''  
A more exotic theory posits that Dark Energy and Dark Matter might be different manifestations of a single, unified entity known as dark fluid. In this model, the properties of dark fluid would change over time, explaining both the gravitational effects attributed to Dark Matter and the accelerated expansion associated with Dark Energy.