Question

In: Physics

What cosmological observations suggest the presence of Dark Energy? What percentage of the energy density in...

What cosmological observations suggest the presence of Dark Energy? What percentage of the energy density in the Universe is Dark Energy?

Solutions

Expert Solution

Dark energy: Dark energy is defined by the unknown form of energy, which effects the universe on the largest scales and acts in opposition to gravity and accounting most of the energy is in it & causing expansion of universe to accelerate...

Some cosmological observations which suggests the presence of dark energy are,

1. Observations of supernovae:In 1998 the researchers team works on a observation of Type 1A supernovae. And they submitted a project which suggests the expansion of universe is accelerating.this project helps to measure the expansion history of universe by looking at the relationship between distance to an object and it's redshift.

2. By measuring of the large scale wave pattern of mass density in the universe proofs the existence of dark energy.

3.observing the CMB model: CMB model i.e cosmic microwave background which indicates the universe is close to flat in shape. Which indicates the mass energy of the universe is equal to the critical density.which also evidence of dark energy.

Now according to CMB(cosmic microwave background)model its about 68.3 % of energy density in the universe is dark energy.

genius_generous answered 2 years ago
Next > < Previous

Related Solutions

1. Dark Energy (a) Why is dark energy "dark"? Why is it "energy"? (b) Give at...
1. Dark Energy (a) Why is dark energy "dark"? Why is it "energy"? (b) Give at least one way that dark energy is different from dark matter. Also give at least one way that dark energy is similar to dark matter. (c) What is the difference between the cosmological constant and dark energy?
Dark Matter accounts for approximately 25% of the energy density of the Universe. The standard neutrinos...
Dark Matter accounts for approximately 25% of the energy density of the Universe. The standard neutrinos account for the majority of this with only a small amount explained by a population of MACHOs. True or false? Explain.
The Hubble Constant, the density of the universe, and the cosmological constant are all vital to...
The Hubble Constant, the density of the universe, and the cosmological constant are all vital to the evolution of our universe. Briefly discuss why each is so important -and- what would happen if we tweaked each one up or down a little. Are there other constants that are equally important? If so, which and why?
Describe what astronomers are talking about when they speak of dark matter and dark energy, and...
Describe what astronomers are talking about when they speak of dark matter and dark energy, and clearly distinguish between them. what fraction is dark matter and what fraction is dark energy? What observational evidence have astronomers amassed to propose the existence of these phenomena?
Why are the Hubble Constant, the Cosmological Constant, and the density parameter so important to cosmology...
Why are the Hubble Constant, the Cosmological Constant, and the density parameter so important to cosmology and to you? Consider expansion rate and age. What would be different about our universe if the Hubble Constant were doubled from its current value? How do these constants factor into the geometry of spacetime? How have these constants changed throughout the lifetime of the universe? Are they still changing? Cite some evidence to support your claims. Please type answer, last persons handwriting was...
Why are the Hubble Constant, the Cosmological Constant, and the density parameter so important to cosmology...
Why are the Hubble Constant, the Cosmological Constant, and the density parameter so important to cosmology and to you? Consider expansion rate and age. What would be different about our universe if the Hubble Constant were doubled from its current value? How do these constants factor into the geometry of spacetime? How have these constants changed throughout the lifetime of the universe? Are they still changing? Cite some evidence to support your claims.
Why are the Hubble Constant, the Cosmological Constant, and the density parameter so important to cosmology...
Why are the Hubble Constant, the Cosmological Constant, and the density parameter so important to cosmology and to you? Consider expansion rate and age. What would be different about our universe if the Hubble Constant were doubled from its current value? How do these constants factor into the geometry of spacetime? How have these constants changed throughout the lifetime of the universe? Are they still changing? Cite some evidence to support your claims.
Why are the Hubble Constant, the Cosmological Constant, and the density parameter so important to cosmology...
Why are the Hubble Constant, the Cosmological Constant, and the density parameter so important to cosmology and to you? Consider expansion rate and age. What would be different about our universe if the Hubble Constant were doubled from its current value? How do these constants factor into the geometry of spacetime? How have these constants changed throughout the lifetime of the universe? Are they still changing? Cite some evidence to support your claims.
What is the Kalam cosmological argument ?
What is the Kalam cosmological argument ?What is the analogical design argument ?What is the best explanation design argument ?
Dark matter; C&O 24.22. (a) Assume that the density of dark matter in our Galaxy is...
Dark matter; C&O 24.22. (a) Assume that the density of dark matter in our Galaxy is given by ρ(r) = ρ0/(1+(r/a) ^2) . Show that the amount of dark matter interior to a radius r is given by: Mr = 4πρ0a^2 [ r − a tan^−1 ( r/a )]. (b) If 5.4 × 10^11 M⊙ of dark matter is located within 50 kpc of the Galactic centre, determine ρ0 in units of M⊙ kpc−1 . Repeat your calculation if 1.9...
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT