The Energy in our Universe
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Transcript of The Energy in our Universe
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The Energy in our Universe
Dr. Darrel SmithDepartment of Physics
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Sources of Energy in the Universe
1. Matter a. Gravity b. Fusion
2. Photons -- CMB 2.7 deg.
3. Neutrinos -- 1.7 deg.
4. Dark Matter
5. Dark Energy
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Our SunHow much power is generated by the sun?
a) 200 megawatts 2 x 108 wattsb) 5,000 terawatts 5 x 1015 wattsc) 2,500 exawatts 2.5 x 1021 wattsd) 380,000,000 exawatts 3.8 x 1026 watts
The power is called the Luminosity (watts)
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How does it make that energy?
Fusion of hydrogen p p p n e+ ne
T + D He4 + n
Surface Temperaturevs.
Core Temperature
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What does it cost to make all this sunshine?
In other words, what does this do to the mass of the sun?
a) Mass is converted to energy
b) Power
c) 1% of the solar mass 100 billion years to burn off
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Energy from type 1a Supernovae
Type 1a Supernovaea)Releases a uniform amount of
energy 1-2 x 1044 joules
b)Luminosity ~ 5 billion times greater than the sun
c) ~10 billion stars in our Milky Way galaxy
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Formation of a supernovae
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Remnants of Supernovae
Crab Nebula (1054 AD)
Power output = 5 x 1031 W = 130,000 Lo
A pulsar in the core providesthe energy.
Pulsar is a highly magnetizedrotating neutron star.
Rotational K.E. is decreasing.
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Supernovae observed
1054 AD Observed by the Chinese
Observed by Anasazisin Chaco Canyon
6500 light years away
1987A Supernova in the LargeMagellanic Cloud.
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Supernovae Summary
1. Energy comes from where?2. Where does the energy go?3. Source of heavy elements4. Indicator of Dark Energy
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Particle Astrophysics
Big Bang CosmologyHow do we know what the early universe was like? The LHC at CERN
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Big Bang Cosmology
From t=0 through todayHow do we know this? Particle Astrophysics
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Particle AstrophysicsThe Tevatron at Fermilab
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The Large Hadron Collider (LHC)
Geneva, Switzerland
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Standard ModelThe physicists equivalent to the periodic table.
Unifies QCD with EW interactions into a single structure.
It does not include gravity.
It is a quantum field theory that is consistent with quantum mechanics and special relativity.
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Standard Model
q = +2/3 e
q = -1/3 e
q = 0 e
q = -1 e
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Particles have masses
Mp = 0.938 Gev/c2
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Big Bang Cosmology
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What is the Higgs Particle?
So, how do particle acquire mass?
Through their interaction with the Higgs field.
W+
W-
Zo
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How is the Higgs formed?
• The fusion of one quark from each proton.
• Coming together at high energy.
A simulated event in the Atlas detector
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How is the Higgs formed?
•The fusion of one gluon from each proton.•Coming together at high energy.
A simulated event in the Atlas detector
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Why such a big machine?
We need high energies to make massive particles.
E = mc2
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Why such small distances?
We need to put that energy in a small volume to make a high energy density.
l = h/p
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Mass vs. Size
Mass is not proptional to size.
Masses of the W and Z particles
MW = 82 GeV/c2
Mz = 90 GeV/c2
Mproton = 0.928 GeV/c2
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Galactic Rotation Curves
Velocity = constant (??)
Bulge + Disk + Dark Halo
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Where’s the “missing mass” ?
Could it be neutrinos? Could it be black holes?
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Dark EnergyDifferent from “dark matter”
It causes the universe to expand (i.e., to accelerate outward.
How is this observed?
http://imagine.gsfc.nasa.gov/docs/science/mysteries_l1/dark_energy.html
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Dark EnergyChanges in the rate of expansion
The more shallow the curve, the faster the rate of expansion.
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Dark EnergyMost of the energy in the universe today is “dark energy.”
Next, comes “dark matter.”
Only 4% of the universe is made of “regular matter.”Neutrons, Protons, electrons, photons, & neutrinos.
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Exotic PropulsionHow can we travel through our galaxy?
Matter-Antimatter propulsion
Nuclear-Thermal Propulsion
Faster-than-light propulsion (??)