Albert Einstein's original field equation would have been able to theoretically have predicted the expansion of the universe, prior to observations in this regard
Q: If p = 2.7 x 10-27 kgm-3, what is the radius of curvature Ro of Einstein's static universe? How long…
A: Given: Density,ρ=2.7×10-27kg/m3Speed of light,c=3×108m/sEinstein's constant,κ=1.86×10-26m/kg Albert…
Q: Andromeda galaxy is the closest large galaxy and is visible to the naked eye. Estimate its…
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Q: If there is no observable edge to the universe, can we determine where its center of expansion is?…
A: Let’s explain by taking a simple example of a balloon analogy to explain the expansion of the…
Q: (a) Calculate the approximate age of the universe from the average value of the Hubble constant, H0…
A: ( a ) To find the time t =dv t = 1Mly106ly1Mly9.46×1012km1ly20km/s t = 4.73 x 1017s
Q: Distances to local galaxies are determined by measuring the brightness of stars, called Cepheid…
A: Absolute brightness is a constant and is 10 parsecs from Earth whereas measured brightness depends…
Q: 5.3 In a positively curved universe containing only matter (2, > 1, K = +1), show that the present…
A: According to the question, the universe contains only matter, where Ωo>1 the scale factor will be…
Q: Consider a universe where Big Bang nucleosynthesis produced significantly more 4He than 1H. Estimate…
A: We have to Consider a universe where Big Bang nucleosynthesis produced significantly more 4He than…
Q: Assume a flat Friedmann-Robertson-Walker universe, and that the density parameters for matter…
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Q: Suppose a hypothetical universe is expanding (at some moment in time) at a rate of H. At this same…
A: Given that for a universe Rate of expanding H = 90 km s-1 Mpc-1 And at this time the density ρ =…
Q: The critical mass density needed to just halt the expansion of the universe is approximately 10-26…
A: Given critical mass density needed to halt the expansion of the universe is ρcrirical = 10-26 kg/m3
Q: Critical density of a universe is found to be 6×10-27 kg/m. Estimate the value of Hubble constant.
A: It was observed that galaxies are moving away from each other and the farther they are faster they…
Q: Consider a universe identical to ours, but where the only difference is that the mass of the proton…
A: Here is the explanation in the given image
Q: A 2 GHz radio signal is detected from a galaxy as 0.86GHz. Estimate the relative velocity.
A: Like all waves light waves also get Doppler shifted. In the case of light waves, the Doppler shift…
Q: The critical mass density needed to just halt the expansion of the universe is approximately 10-26…
A: Given that,The critical mass density = 10-26 kg/m3Average mass = 7 eV/c2As we know that,If m is in…
Q: b) The cosmic microwave background dates to a time when the universe was -380,000 years old, or to a…
A: Given: 380000 years ago Tr=3000 Kz=1100
Q: Show that in matter dominated universe density behave as p x (1+z)3 , in radiation dominated as px…
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Q: Distances to very remote galaxies are estimated based on their apparent type, which indicate the…
A: The relation of brightens of the star is inversely proportional to the square root of the distance…
Q: In 1998 a galaxy named RD1 was discovered with a redshift of 5.34. (a) What is the speed of this…
A: (a) It is given that z=5.34 , 1+β1-β=1+z Squaring both sides, 1+β1-β=6.342 =…
Q: n. Estimate the relative velocity.
A: Given: Lo=2m L=0.75m To find: Relative velocity
Q: Explain why the cosmological principle requires that H0 must have the same value everywhere in…
A: Given Explain why the cosmological principle requires that H0 must have the same value everywhere in…
Q: The energy density ϵ in radiation is related to its temperature by ϵ=αT4. Compute the temperature…
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Q: Estimate the critical density of the universe if the Hubble's constant was 100 km/s/Mpc.
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Q: The largest known redshift attributed to a specifi c molecule is z = 6.42 from the CO molecule in…
A: Given data: The red-shift parameter is z=6.42. The red-shift parameter z and relative velocity…
Q: Use the Friedmann equations to show that the deceleration parameter go and the density parameter N…
A: According to Dark energy and the cosmological constant, the acceleration of the scale factor is…
Q: Estimate the critical density of the universe if the Hubble's constant was 50 km/s/Mpc.
A: The minimum density that is required to stop the expansion of the universe is defined as the…
Q: According to the version of the Big Bang Theory without a Cosmological Constant (and without Dark…
A: Hubble's Law states that as the universe is expanding in all directions, the receding velocity of an…
Q: Explain why it only appears that we are at the center of expansion of the universe and why an…
A: Universe is expanding from everywhere and it has no center of expansion. Materials expand from a…
Q: If the universe is infinite, does it have a center? Discuss.
A: The universe is infinite, and what is know about the universe is gathered by analysing the…
Q: If the average density of the Universe is small compared with the critical density, the expansion of…
A: According to Hubble’s law v = HR The expression for R is R=vΔt Thus, v=HvΔtΔt=1H Here, ∆t is the…
Q: Consider the following line element, ds^2 = −dt^2 + a^2(t) (dx^2 + dy^2) + b^2(t) dz^2, where a(t)…
A: The objective of the question is to determine whether the given line element obeys the Cosmological…
Q: The great astronomer Edwin Hubble discovered that alldistant galaxies are receding from our Milky…
A: a)
Q: Assume a power law for the scale factor a = Ctn, where C is a constant. (a) For what values of n are…
A: Given data: Scale factor is, a=Ctn. C is a constant.
Q: a: Assume the universe is flat, and the density parameters of matter and the cosmological constant…
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Q: Briefly explain what is meant by "particle horizon" and "event horizon" in cosmology. Calculate the…
A: To explain Particle Horizon and Event Horizon
Q: If some unknown cause of red shift—such as light becoming “tired” from traveling long distances…
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Q: Suppose a hypothetical universe is expanding (at some moment in time) at a rate of H. At this same…
A: It is given that, for a universe, at this time,the rate of expanding H=56 km s-1Mpc-1and the density…
Albert Einstein's original field equation would have been able to theoretically have predicted the expansion of the universe, prior to observations in this regard ?
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