Question

1. Dark Energy (a) How can we test whether our universe has a cosmological constant? (b)...

1. Dark Energy

(a) How can we test whether our universe has a cosmological constant?

(b) What would it mean if a cosmological constant can explain the acceleration of the universe? What question(s) would that raise?

(c) What would it mean if a cosmological constant cannot explain the acceleration of the universe? What question(s) would that raise?

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
1. Dark Energy (a) How can we test whether our universe has a cosmological constant? (b)...
1. Dark Energy (a) How can we test whether our universe has a cosmological constant? (b) What would it mean if a cosmological constant can explain the acceleration of the universe? What question(s) would that raise? (c) What would it mean if a cosmological constant cannot explain the acceleration of the universe? What question(s) would that raise?
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?
The law of conservation of energy states that energy can be converted from one form to...
The law of conservation of energy states that energy can be converted from one form to another but cannot be created or destroyed. Therefore, the amount of energy in the universe is constant. In your initial post to the discussion, respond to the following prompts: What do you think would happen if energy were not conserved? Think of (and share) two scenarios in which our lives would be drastically altered if this law of conservation was not in place. At...
2 2. Suppose next that we have even less knowledge of our patient, and we are...
2 2. Suppose next that we have even less knowledge of our patient, and we are only given the accuracy of the blood test and prevalence of the disease in our population. We are told that the blood test is 9# percent reliable, this means that the test will yield an accurate positive result in 9#% of the cases where the disease is actually present. Gestational diabetes affects #+1 percent of the population in our patient’s age group, and that...
At an eclipse, we can measure how much light bends going by the Sun. If we...
At an eclipse, we can measure how much light bends going by the Sun. If we assume the gravitational acceleration going by the sun is constant and equal, in magnitude, to the acceleration of gravity at the surface of the sun, how far would we see light defect from a straight line path as it travels one Sun diameter, 1.39 × 109 m? The gravitational acceleration at the surface of the sun is 274 m/s2. A) 12.7 cm        B) 8.94...
We understand that heat or thermal energy can flow from one substance to another, but could...
We understand that heat or thermal energy can flow from one substance to another, but could it be possible that coldness is an attribute that flows from one object to another? If this were true, how would our understanding of temperature change? Explain why heat must flow from warm to cold. Which term describes the amount of thermal energy required to melt or freeze 1 kg of a substance? a. specific latent heat of vaporization b. latent heat of vaporization...
2. Suppose next that we have even less knowledge of our patient, and we are only...
2. Suppose next that we have even less knowledge of our patient, and we are only given the accuracy of the blood test and prevalence of the disease in our population. We are told that the blood test is 95 percent reliable, this means that the test will yield an accurate positive result in 95% of the cases where the disease is actually present. Gestational diabetes affects 6% of the population in our patient’s age group, and that our test...
We can derive the potential energy stored in an ideal spring when it is stretched or...
We can derive the potential energy stored in an ideal spring when it is stretched or compressed by computing the work done due to Hooke’s law. In this experiment we will be working with springs. When they are not being stretched by some external force, the coils of these springs are held tightly together by the spring’s rigidity. They are held so tightly that a small amount of weight can be hung from these springs, and they don’t stretch at...
QUESTION 1: We can roughly model a gymnastic tumbler as a uniform solid cylinder of mass...
QUESTION 1: We can roughly model a gymnastic tumbler as a uniform solid cylinder of mass 75.0 kg and diameter 1.20 m . A) If this tumbler rolls forward at 0.450 rev/s, how much total kinetic energy does he have? K= B) What percent of his total kinetic energy is rotational? Krot/K= QUESTION 2: A 2.70-kg grinding wheel is in the form of a solid cylinder of radius 0.100 m. A) What constant torque will bring it from rest to...
1. We gave a national verbal proficiency test that has a mean of 500 and a...
1. We gave a national verbal proficiency test that has a mean of 500 and a standard deviation of 75. How many, out of the 1500 subjects we tested, are likely to score above 400 on this test? 2. We gave a national verbal proficiency test that has a mean of 500 and a standard deviation of 75. What raw score on this test is so low that it would occur 5 % of the time or less?