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Note that if the talk's pdf or ppt is available after the talk, you can get it by clicking on the talk title.

Physics/Astronomy C290C Cosmology and Cosmology-BCCP Seminar
The Physics/Astronomy C290C series consists of the Cosmology-BCCP LBNL-Physics-Astronomy Cosmology seminars held Tuesdays 1:10-2:00 pm in room B1 (also videoconferenced to 50-5026) Hearst Field Annex. Feel free bring your lunch.
Please contact Joanne Cohn to add to this list or to suggest speakers.

Speaker/Visitor Info is here.



ACBAR


BOSS and Nyx
(Image by C. Stark)

Note that there are also other talks which generally might be of interest, including:


August 2014:
Aug. 22, Friday
12 noon (INPA)
David J.E. Marsh, Perimeter
LBL 50-5026
Quintessence in a quandary: on prior dependence in dark energy models
The archetypal theory of dark energy is quintessence: a minimally coupled scalar field with a canonical kinetic energy and potential. By studying random potentials we show that quintessence imposes a restricted set of priors on the equation of state of dark energy. Focusing on the commonly-used parametrisation, $w(a)\approx w_0+w_a(1-a)$, we show that there is a natural scale and direction on the $(w_0, w_a)$ plane that distinguishes quintessence as a general framework. We calculate the expected information gain for a given survey and show that, because of the non-trivial prior information, it is a function of more than just the figure of merit. This allows us to make a quantitative case for novel survey strategies.

September 2014:
Sep. 2, Tuesday
1:10 pm (Cosmology/BCCP)
Sirio Belli, Caltech
Hearst Field Annex B-1
"Deep Keck spectroscopy of 1 < z < 2.5 quiescent galaxies: constraining the size growth and the mass assembly of the red sequence "
The most effective probe of the physical nature of quiescent galaxies is absorption line spectroscopy, which is particularly challenging at high redshift. Using the improved sensitivity of optical and infrared detectors at the Keck observatory, and the multiplex advantage of its new MOSFIRE spectrograph, we have undertaken a new spectroscopic survey of over 100 galaxies selected according to stellar mass and rest-frame optical color in the redshift range 1 < z < 2.5. Velocity dispersions and stellar ages derived from our spectra, together with HST-based sizes, provide valuable insight into the mass assembly of quiescent galaxies. We find that the stellar to dynamical mass ratio evolves with redshift, which might imply a change in the dark matter fraction or in the stellar initial mass function. We also find that recently quenched galaxies are systematically larger in size, which enables us to quantify how "progenitor bias" contributes to the observed size evolution. We conclude that at least half of the size evolution of the red sequence observed at z~1.5 is due to physical growth of individual galaxies.
Sep. 4, Thursday
4:10 pm (Astronomy Colloquium)
Linda Tacconi, MPE, Garching
2 LeConte Hall
"The Evolution of Molecular Gas and Star Formation from the Peak Epoch of Galaxy Formation to the Present"
Comprehensive and systematic studies of the molecular content of galaxies during the epochs that are associated with the peak (z~1-2), and subsequent winding down (z<1) of star formation in the Universe are enabling us to illustrate the important role that cold gas, , the fuel for star formation, has played in the assembly of galaxies across cosmic time. Surveys, including COLDGASS and PHIBSS1&2, already provide robust molecular gas detections in hundreds of normal, star forming galaxies, from redshifts 0-2.5. In this talk, we focus on results from PHIBSS, comprising two IRAM Large Programs, where we are we have are mapping the CO J=3-2 or J-2-1 line emission in ~200 such galaxies from z=0.5-2.5; we find that galaxies at these epochs are very gas rich, relative to their star-forming counterparts in the local Universe. We discuss scaling relations for massive star forming galaxies that we derive from these data, and the impact of all of these new observations on our understanding of galaxy evolution in the early Universe.
Sep. 5, Friday
12 noon (INPA)
Adam Solomon, Cambridge
LBL 50-5026

Sep. 9, Tuesday
1:10 pm (Cosmology/BCCP)
Frederick Davies, UCLA
Hearst Field Annex B-1

Sep. 16, Tuesday
1:10 pm (Cosmology/BCCP)
Shea Garrison-Kimmel, Irvine
Hearst Field Annex B-1

Sep. 23 and 30, Tuesday
no Tuesday talks,
Astronomy Dept move

October 2014:

Oct 3, Friday
12:00 pm (INPA/Cosmology/BCCP)
Yin Li, Chicago
LBL 50-5026 INPA room

Oct. 7, Tuesday
1:10 pm (Cosmology/BCCP)
Benedikt Diemer, Chicago
Hearst Field Annex B-1

Oct. 14, Tuesday
1:10 pm (Cosmology/BCCP)
Simone Ferraro, Princeton
Hearst Field Annex B-1

Oct. 21, Tuesday
1:10 pm (Cosmology/BCCP)
Josh Dillon, MIT
Hearst Field Annex B-1

Oct. 28, Tuesday
1:10 pm (Cosmology/BCCP)
Joseph Clampitt, Penn
Hearst Field Annex B-1

Oct 31, Friday
12:00 pm (INPA/Cosmology/BCCP)
Liang Dai, JHU
LBL 50-5026 INPA room


November 2014:

Nov. 4, Tuesday
1:10 pm (Cosmology/BCCP)
Colin Slater, Michigan
Hearst Field Annex B-1

Nov. 11, Tuesday

Veteran's Day, no talk


Nov. 18, Tuesday
1:10 pm (Cosmology/BCCP)
Emanuele Castorina, SISSA
? Campbell Hall


December 2014:

Dec. 2, Tuesday
1:10 pm (Cosmology/BCCP)
Jes Ford, UBC
Hearst Field Annex B-1





Past Months

Cosmology Seminars in Previous Years

   
            
 
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