The discovery of dark energy
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The Discovery of Dark Energy. Gerson Goldhaber Physics Department University of California at Berkeley and LBNL. Standard Candles after Calibration. Calibrated Standard Candles. Why are all the Type Ia SNe of nearly the same brightness?.

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The Discovery of Dark Energy

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The Discovery of Dark Energy

Gerson Goldhaber

Physics Department

University of California at Berkeley

and LBNL


Standard Candles after Calibration

Calibrated Standard Candles

Gerson Goldhaber, SFSU Colloquium


Why are all the Type Ia SNe of nearly the same brightness?

  • When a star of near Solar Mass uses up all of its Hydrogen and Helium it collapses to a White Dwarf. (W.D.)

  • If the White Dwarf has a companion star then, for the right conditions, Mass can be Transferred to the W.D.

  • Type Ia SNe are due to the explosion of a W.D. This occurs when it reaches a mass of 1.4 M0(the Chandrasekhar limit) from Mass Transfer

Gerson Goldhaber, SFSU Colloquium


Positive Image Dec 28, 1989

Gerson Goldhaber, SFSU Colloquium


Negative Image Jan 23 1990

Gerson Goldhaber, SFSU Colloquium


Superimposed images

Gerson Goldhaber, SFSU Colloquium


Supernova Discovery and Measurement Sequence.

Gerson Goldhaber, SFSU Colloquium


Gerson Goldhaber, SFSU Colloquium


The Sky in Chile

By Chris Smith at Cerro Tololo

Gerson Goldhaber, SFSU Colloquium


The Hubble SpaceTelescope

\

Gerson Goldhaber, SFSU Colloquium


Expansion History of the Universe

Gerson Goldhaber, SFSU Colloquium


Discovery of Dark Energy

A Supernova explodes and the light reaches us some

9 billion years later. The light started out about 4.5 billion

years before our solar system was formed.

Gerson Goldhaber, SFSU Colloquium


Supernova Light Curve and Spectrum

Gerson Goldhaber, SFSU Colloquium


SNe Light Curves from the HST and Images

Gerson Goldhaber, SFSU Colloquium


Type Ia SNe and the Expansion of the Universe

Observation of Time Dilation negates “Tired Light”

1/(1+z)

1/(1+z)s

Gerson Goldhaber, SFSU Colloquium


Adjusting for Stretch

Gerson Goldhaber, SFSU Colloquium


Series of Hubble Curves to allow the Measurement of M

Gerson Goldhaber, SFSU Colloquium


Gerson Goldhaber, SFSU Colloquium


Hubble Curves

Gerson Goldhaber, SFSU Colloquium


Sullivan et al. 2003Elliptical Galaxies contain less Dust


Concordance between SNe, CMB and Clusters

M

Gerson Goldhaber, SFSU Colloquium


w vs. M (w =p/)

Gerson Goldhaber, SFSU Colloquium


Gerson Goldhaber, SFSU Colloquium


Gerson Goldhaber, SFSU Colloquium


Riess et al. 2004 SNe from the HST.

Acceleration and earlier Deceleration


Strong Gravitational Lensing

Gerson Goldhaber, SFSU Colloquium


Gerson Goldhaber, SFSU Colloquium


First SN discovered in a cluster in this search

preliminary

Cluster RCS0221-03

at z = 1.02


SNe discovered in ongoing search

z=1.316

preliminary

z=0.926

preliminary

Gerson Goldhaber, SFSU Colloquium


Gerson Goldhaber, SFSU Colloquium


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