Bigbang 20091205 (student preso)


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general physics
5 dec 2009

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Bigbang 20091205 (student preso)

  1. 1. Big Bang<br />The Start of the Universe<br />
  2. 2. Big Bang Vs BIG BANG<br />or<br />
  3. 3. Discovered by Edwin Hubble that our Universe is expanding<br />Before that it is a single point <br />Estimated to be12-14 billion years ago<br />Born in a single violent call “Big Bang”<br />Theory for the origin of our universe<br />The most popular theory among others<br />What is Big Bang?<br />NASA Says:<br />The Big Bang Theory is a broadly accepted theory for the origin and evolution of our universe. It postulates that the observable universe started from an instantaneously expanding point, roughly ten to twenty billion years ago.<br />
  4. 4. According to scientists, there’s nothing, not even space before Big Bang<br />Universe start off as singularity<br />Singularity – our current physic can’t explain yet<br />No answers on the origin of singularity<br />Singularity<br />
  5. 5.<br />
  6. 6. Matter (atoms)– stars, planets, steroids and so on…<br />Radiation (cold dark matter)– include electromagnetic radiation, though not significant part of energy today, in the past it is dominant part of it<br />Dark Energy – Little known about, Quantum field theory suggest, there’s always energy even if there’s no matter and radiation<br />Contents of Universe<br />
  7. 7. Detailed component of universe<br />
  8. 8. 1. Expansion of universe – once it must be small as it cannot shrink<br />2. Cosmic Microwave Background Radiation (CMB) - discovered in 1965 by Arno Penzias and Robert Wilson while working on microwave receiver used to communicate with the Telstar satellite<br />3. Abundance of different element- hydrogen (~72%), helium (~28%), and other elements should be made, observation shown the same as predicted<br />4. The only theory that lays down framework for the universe we observe today<br />4 Main Evidences<br />
  9. 9. Hubble’s Law and The Expansion of Space<br />v is the recessional velocity of the galaxy or other distant object <br />D is the comoving proper distance to the object and <br />H0 is Hubble&apos;s constant, measured to be 70.1 ± 1.3 km/s/Mpc by the WMAP probe<br />
  10. 10. Excessive use of assumptions<br />Universe has too much large structure to be formed in 10-20 billion years<br />Ages of stars globular clusters are older than the Universe<br />No change before Big Bang, how could it start?<br />If there’s Big Bang, the background temperature of radiation is suppose to be much higher than in the past<br />Problems with Big Bang Theory<br />
  11. 11. Owned by CERN<br />CERN, European Organization for Nuclear Research (Conseil Européen pour la Recherche Nucléaire in French)<br />A giant instrument thatphysicists use to itstudysmallestknownparticles – the fundamental building block of all things<br />Used to create condition justafterBig Bang by sendingtwobeams of either protons ion or lead ion<br /> The Hadron Collider<br />
  12. 12. Two scenarios<br />1. mass density of universe greater than critical density which leads the universe will get to big to and collapses / it become denser and hotter. Same result<br />2. When the mass density of universe of universe is equal to the critical density, the expansion of universe will slow down<br />End of the world?<br />
  13. 13.<br /><br /><br /><br />References<br />