Dark energy with GMT ( 2020) From Lucas Macri. Dark energy with GMT ( 2020) From Lucas Macri.

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Presentation transcript:

Dark energy with GMT ( 2020) From Lucas Macri

Sketch of the timeline of the Universe in the ΛCDM model Sketch of the timeline of the Universe in the ΛCDM model. The accelerated expansion in the last third of the timeline represents the dark-energy dominated era.

Variation of Fundamental Constants? Quasar spectra mostly have a precision of 10-7 (corresponding to 20-100 m/s), however recently one measurement at the 1m/s was done QSO emit white light Light is absorbed in galaxy(ies) on its way to earth Absorption lines are redshifted Ratio of fine structure lines gives value of alpha

Simulated spectrum of a high redshift quasar with z=3

Comb calibrated stellar Spectra T. Wilken et al., Nature 485, 611 (2012)

Direct detection of expansion 400 nights of GMT time over 20 years acceleration From “Cosmic Dynamics in the Era of Extremely Large Telescopes” deceleration 5x109 yr 8x109 yr 1x1010 yr 1.1x1010 yr 1.2x1010 yr 1.37x1010 yr CMB Z=1000