Nope. To the best of our measurements space is flat but spacetime is curved.richard.coppack said:isn't our universe flat spacetime ?
Thank you for your reply. Yes, spacetime is curved near a massive object. On a cosmic scale, isn't spacetime broadly flat?Dale said:Nope. To the best of our measurements space is flat but spacetime is curved.
No, spacetime in the LCDM model is not flat. Just space.richard.coppack said:Thank you for your reply. Yes, spacetime is curved near a massive object. On a cosmic scale, isn't spacetime broadly flat?
The conservation of energy is a fundamental law of physics that states that energy cannot be created or destroyed, but can only be transformed from one form to another. This means that the total amount of energy in a closed system remains constant over time.
The cosmological constant, also known as dark energy, is a term in Einstein's theory of general relativity that represents the energy density of the vacuum of space. It plays a role in the overall energy balance of the universe and is thought to contribute to the expansion of the universe. However, it does not violate the conservation of energy because it is not a source of energy, but rather a property of space itself.
Dark energy is a mysterious form of energy that is thought to make up about 70% of the total energy in the universe. It is believed to be responsible for the accelerating expansion of the universe, counteracting the gravitational pull of matter. Its exact nature is still unknown, but it is thought to be a property of space itself and does not interact with other forms of matter or energy.
No, the conservation of energy cannot be violated by dark energy. While dark energy does contribute to the overall energy balance of the universe, it does not create or destroy energy. It is simply a property of space that is thought to be responsible for the expansion of the universe.
The study of dark energy is crucial in understanding the evolution and fate of the universe. Its presence and effects on the expansion of the universe can help us better understand the structure and composition of the universe, as well as the fundamental laws of physics. It also plays a role in the search for a unified theory that can explain the workings of the universe on both a large and small scale.