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newton1
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i heard that dark energy is "negative preasure"!
Is it possible??
Is it possible??
Originally posted by Newton1
i heard that dark energy is "negative preasure"!
Is it possible??
Originally posted by marcus
There are two hard-to-understand things that must be grasped.
(1) why does a constant energy density cause negative pressure?
(2) why does negative pressure promote expansion?
These two things are not merely current theory but have been known by relativists (GR specialists) for almost 90 years. They are not "intuitive" but they are basic and worth trying to understand.
You can find explanations on the web (try gurus like John Baez, Ned Wright, Charles Lineweaver, as well as the people mathman mentioned). But I can try to save you some trouble by giving the standard explantions here.
Dark energy is a hypothetical form of energy that is believed to make up about 68% of the total mass-energy of the universe. It is important to study because it is thought to be responsible for the accelerating expansion of the universe, and understanding it could lead to a deeper understanding of the fundamental laws of physics.
Negative pressure is a property of dark energy that is thought to cause it to have a repulsive effect, pushing galaxies apart and contributing to the expansion of the universe. It is the opposite of the more commonly known positive pressure, which is responsible for holding objects together.
Scientists use a variety of observational and theoretical methods to explore the possibility of dark energy's negative pressure. These include measuring the expansion rate of the universe, studying the distribution of matter and energy, and testing different models and theories that attempt to explain the nature of dark energy.
If dark energy's negative pressure is confirmed, it could have significant implications for our understanding of the universe. It could potentially provide insights into the nature of gravity, the structure of space-time, and the ultimate fate of the universe.
One of the biggest challenges in studying dark energy's negative pressure is the lack of direct evidence for its existence. Other challenges include the difficulty of measuring the expansion rate of the universe with precision, and the need for more advanced technology and instruments to study the properties of dark energy in more detail.