Colloquia Schedule Spring 2011

Colloquia are on Tuesdays (unless otherwise indicated) at 3:30 pm in RLM 15.216B

Jan. 18

Dust in the Early Universe

abstract

Raffaella Schneider

INAF/Osservatorio Astronomico di Roma

host: Volker Bromm

Jan. 25

Magnetic Relaxation in ICM Bubbles and the Magnetic Flux Problem in Star Formation

abstract

Jonathan Braithwaite

University of Bonn (TCC Tinsley Scholar)

host: Craig Wheeler

Feb. 1

Reading the Record of Ancient Impacts

abstract

Peter Goldreich

California Institute of Technology

host: Pawan Kumar

Feb. 8

Star Formation in Galaxy Clusters Over the Past 10 Billion Years

abstract

Kim-Vy Tran

Texas A&M University and University of Zurich

host: Neal Evans

Feb. 11-12

McDonald Observatory Board of Visitors Meeting (Austin)


Feb. 12
1-2 PM
ACE 2.302

19th Annual Great Lecture in Astronomy

Exploring Newly Discovered Worlds with the Giant Magellan Telescope

abstract

Daniel Jaffe

University of Texas at Austin

Feb. 15

Is Inhomogeneity Important in Cosmology?

The real universe is comprised of a cosmic web of structures, with vast walls and voids on larger scales and mostly empty space on smaller scales. Is this significant for cosmology, or can we ignore it and used the standard linearized Robertson-Walker models with impunity? There are three ways inhomogeneities can affect the values we assign cosmological parameters on the basis of astronomical observations. Firstly there may be back-reaction from small scale inhomogeneities to large scale dynamics; this almost certainly occurs, but is probably not important, although there are some caveats to that statement. Secondly the observational properties of a universe with major voids can be significantly different from those of a smoothed out model: this has the potential to cause significant re-evaluation of the interpretation of the supernova observations. Thirdly a large-scale underdensity, with our Galaxy somewhere near the centre, can mimic the apparent acceleration of the universe, indeed the observations can be explained by inhomogeneous models with no dark energy present. These models are philosophically unpopular, but philosophy will have to give way to observational tests that can check whether the Copernican Principle is indeed satisfied or not. Recent claims that these models have been observationally disproved are overstated: the required perturbation calculation have not yet been properly deployed.

close

George F. R. Ellis

University of Cape Town

host: Tanja Rindler-Daller

Feb. 16
Wed.
3:15 PM

Exploration of the Circum-Galactic Medium at High Redshifts

abstract

Charles Steidel

California Institute of Technology (Tinsley Visiting Professor)

host: Karl Gebhardt

Feb. 22

Clarifying our View of Star Formation in Extreme Environments with Adaptive Optics

abstract

Jessica Lu

California Institute of Technology

host: Jenny Greene

Mar. 1

DeVaucouleurs Medalist

Chemical Abundances in the Oldest Galactic Stars: Globular Clusters vs. the Halo Field

abstract

Robert Kraft

UCOLICK

host: Chris Sneden

Mar. 8

DEEP2 and Beyond: Studying Galaxy Evolution and Large-Scale Structure with Deep Surveys

abstract

Jeffrey A. Newman

University of Pittsburgh (TCC Visiting Speaker)

host: Eiichiro Komatsu

Mar. 15

Spring Break: 14-18 March: No talk scheduled


Mar. 22

Diverse Energy Sources for Supernovae

abstract

Lars Bildsten

UCSB/Kavli Institute for Theoretical Physics (Tinsley Visiting Professor)

host: Donald Winget

Mar. 24
Public Talk
RLM 4.102
7:00 PM

Exploding Stars!

abstract

Lars Bildsten

UCSB/Kavli Institute for Theoretical Physics (Tinsley Visiting Professor)

host: Donald Winget

Mar. 29

Recent Advances in our Understanding of Enigmatic Gamma-ray Bursts

abstract

Pawan Kumar

University of Texas at Austin

host: TBD

Apr. 5

Physical Properties of Kepler's Small Exoplanets

abstract

Dimitar D. Sasselov

Harvard-Smithsonian Center for Astrophysics

host: Jenny Greene

Apr. 12

The Physical Properties of Lyman-alpha Emitters from z=2 to 3

abstract

Caryl Gronwall

Pennsylvania State University

host: Karl Gebhardt

Apr. 19

Thermal Tides: An Explanation for the Inflated Radii of the Hot Jupiters

abstract

Aristotle Socrates

Institute for Advanced Study, Princeton

host: Jenny Greene

Apr. 26

Magnetic Reconnection and the Evolution of Large Scale Magnetic Fields

abstract

Ethan Vishniac

McMaster University, Ontario, Canada

host: Craig Wheeler

May 3

Title: TBA

Speaker: TBD

Affiliation: TBD

host: TBD

Visitors to the Department of Astronomy can find detailed information and maps on our Visiting Austin Page.

Please report omissions/corrections to: G. Orris at argus@astro.as.utexas.edu.

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