Presentation on theme: "Universe: from Beginning to End Brief History of Universe form Birth to Death OR."— Presentation transcript:
Universe: from Beginning to End Brief History of Universe form Birth to Death OR
What is matter? Experiments at Fermilab have helped defined the proton, a particle inside the atom’s nucleus, and proton’s substructure of quarks. Study the top quark may give clues to the scientific mystery of why matter has mass
Classification of Matter
Particles of the Standard Model
Neutron n p + e - + e Decay time minutes
Bineutron D 2 n + or D n + n + D 2 n + or D n + n +
Trineutron 3 n is trineutron a bound state of three neutron?
Tetraneutron 4 n is tetraneutron a bound state of four neutron?
Transition operator 2 d d Final State: Nucleons in continuum spectrum 4 He, 3 He, 3 H
From Elementary Particles to Stars We discussed the tiniest object in the universe – the neutron, and existence of the bineutron, trineutron and tetraneutron. Now we leap to the largest – stars especially, neutron stars
History of our Universe t=0 The Big Bang Universe originated in the explosion of a primordial fireball 0
Atomic Structure Atomic Nucleus
The process of stellar evolution from the birth to the death of the star depends on the mass of the star. If the star has mass less than about 1.4 solar masses the star collapses under the action of gravity and becomes a white dwarf If mass is greater than 1.4 solar mass the stars follow to quite different scenario. High-energy collisions breaking iron into helium nuclei, and eventually into protons and neutrons 56 Fe 13 4 He + 4n 4 He 2p + 2n Then e - + p n + The star begins to contract rapidly toward forming an enormously dense neutron star The core of a neutron star contracts to the point at which all neutrons are as close together as they are in a nucleus.
Black Holes If the mass M of the star is compressed to such small size that the escape speed exceeds the speed of light, the mass M forms a BLACK HOLE
Big Crunch Universe stops expanding at some time in the future, will then contract again down to its initial, highly condensed state in a finite time …starts another expansion phase Or will it just go on contracting and then … … new Big Bang