bigbang 20091205 (student preso)
DESCRIPTION
student presentation general physics 5 dec 2009TRANSCRIPT
The Start of the Universe
Big Bang
Big Bang Vs BIG BANG
or
Discovered by Edwin Hubble that our Universe is expanding
Before that it is a single point Estimated to be12-14 billion years ago Born in a single violent call “Big Bang” Theory for the origin of our universe The most popular theory among others
What is Big Bang?
NASA Says: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.
According to scientists, there’s nothing, not even space before Big Bang
Universe start off as singularity Singularity – our current physic can’t
explain yet No answers on the origin of singularity
Singularity
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Matter (atoms)– stars, planets, steroids and so on…
Radiation (cold dark matter)– include electromagnetic radiation, though not significant part of energy today, in the past it is dominant part of it
Dark Energy – Little known about, Quantum field theory suggest, there’s always energy even if there’s no matter and radiation
Contents of Universe
Detailed component of universe
1. Expansion of universe – once it must be small as it cannot shrink
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
3. Abundance of different element- hydrogen (~72%), helium (~28%), and other elements should be made, observation shown the same as predicted
4. The only theory that lays down framework for the universe we observe today
4 Main Evidences
Hubble’s Law and The Expansion of Space
v is the recessional velocity of the galaxy or other distant object D is the comoving proper distance to the object and H0 is Hubble's constant, measured to be 70.1 ± 1.3 km/s/Mpc by the WMAP probe
Excessive use of assumptions Universe has too much large structure to be
formed in 10-20 billion years Ages of stars globular clusters are older
than the Universe No change before Big Bang, how could it
start? If there’s Big Bang, the background
temperature of radiation is suppose to be much higher than in the past
Problems with Big Bang Theory
Owned by CERN CERN, European Organization for Nuclear Research
(Conseil Européen pour la Recherche Nucléaire in French)
A giant instrument that physicists use to it study smallest known particles – the fundamental building block of all things
Used to create condition just after Big Bang by sending two beams of either protons ion or lead ion
The Hadron Collider
Two scenarios 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
2. When the mass density of universe of universe is equal to the critical density, the expansion of universe will slow down
End of the world?
http://public.web.cern.ch http://www.big-bang-theory.com/ http://ssscott.tripod.com/BigBang.html http://www.youtube.com/watch?v=faRb8VW
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References