The physics of inflation and dark energy 1.3 Dark energy: some evidence (short list) •Ages of glob. clusters/galaxies at z~2-3: m 0.6 •SN Ia: - m 0.3 •CMB: + m 1.0 • Large scale motions: 0.15 m 0.4 •Cluster mass function: m 0.3 Bottom line: many indep. hints that m 0.35 0.65
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The physics of inflation and dark energy 1.3 Dark energy: some evidence (short list) Ages of glob. clusters/galaxies at z~2-3: m 0.6 SN Ia: -
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The physics of inflation and dark energy
1.3 Dark energy: some evidence (short list)
•Ages of glob. clusters/galaxies at z~2-3: m 0.6
•SN Ia: - m 0.3
•CMB: + m 1.0
•Large scale motions: 0.15 m 0.4
•Cluster mass function: m 0.3
Bottom line: many indep. hints that m 0.35
0.65
0.0)
The physics of inflation and dark energy 2. How to achieve acceleration
•Newtonian physics ?DENIED
...only mass is a source for gravity in Newtonian physics
•Einstein’s theory ?
APPROVED...energy density and pressure are components of a tensor (the stress-energy
tensor Tab) and both are sources for gravity
2.1 Physical basis
=> gravity is always attractive...
=> gravity can be “repulsive” (cosmologically) if pressure is sufficiently negative !