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exmarine
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What are the current values for Friedman's scalar and its first derivative with respect to time?
Thanks.
Thanks.
a(t) doesn't mean itself anything. The ratios of a(t) matters. Like a(t_0)/a(t_1)exmarine said:Yes, what is the current value of the Hubble parameter? It should be some number per unit time?
Friedman's scalar is a mathematical quantity used in cosmology to help describe the curvature of the universe. It is a measure of the expansion rate of the universe, and is named after physicist and mathematician Alexander Friedman.
Friedman's scalar is calculated using the equations of general relativity, specifically the Friedman-Lemaître-Robertson-Walker (FLRW) metric. It takes into account the density of matter and energy in the universe, as well as the expansion rate of the universe.
The current value for Friedman's scalar is estimated to be around 0.27, based on observations of the cosmic microwave background radiation. Its derivative, also known as the Hubble parameter, is currently estimated to be around 70 km/s/Mpc. However, these values are subject to ongoing research and may be refined in the future.
Friedman's scalar is directly related to the expansion rate of the universe. A higher value for the scalar means the universe is expanding at a faster rate, while a lower value indicates a slower expansion. This can have implications for the future of the universe, such as whether it will continue to expand indefinitely or eventually collapse.
Friedman's scalar is an important tool for understanding the evolution and structure of the universe. It helps us make predictions about the behavior of the universe, such as the age and size of the universe, and can also provide insights into the nature of dark energy, which is thought to be responsible for the accelerated expansion of the universe.