Tommaso Treu


1.   Galaxy Formation and Evolution. Examples of my research can be found here.

2.  Co-evolution of spheroids and black-holes.

3.  Gravitational Lensing and dark matter in galaxies and clusters of galaxies.

4.  Cosmography from gravitational time delays, more details can be found here, and here.

5.  Galaxies at the epoch of reionization, more details can be found here.

For a more accessible description of my research, take a look at the following press releases (and you if you have nothing better to do you can listen to this interview with Austrlian Radio or this public lecture of mine or this interview by Mike Shara):

2020. Hubble Detects Smallest Known Dark Matter Clumps

2020. New Hubble Measurement Strengthens Discrepancy in Universe’s Expansion Rate

2019. Seeing double could help resolve dispute about how fast the universe is expanding

2018. Hubble Uncovers the Farthest Star Ever Seen

2017. Cosmic lenses support finding on faster than expected expansion of the Universe

2015. Caught in the act: Hubble captures first-ever predicted exploding star

2015. Measuring a black hole mass with robotic telescopes

2015. Hubble Sees Supernova Split into Four Images by Cosmic Lens

2012. Abell 383: getting a full picture of an elusive subject

2012. Hubble pinpoints farthest protcluster of galaxies ever seen

2010. Astronomically Large Lenses Measure the Age and Size of the Universe

2008. A cosmic collision and the nature of dark matter

2008. SLACS: the complete ACS sample

2008. A Double Einstein Ring

2007. Tiny Galaxy with Cosmic Telescope

    (see also this link)

2005. SLACS Einstein Rings

2003. Dark Matter in Galaxy Cluster Cl0024

1998. An Extremely Red Galaxy

Research Interests:

Contact Information:


E-mail: tt AT

Professor at UCLA

students and postdocs:


Shawn Knabel (grad)

Devon Williams (grad)

Lizvette Villafana (grad)

Thomas Schmidt (grad)

Veronica Dike (grad)

Peter Williams (postdoc)

Ioana Zelko (postdoc)

Yoon Chan Taak (postdoc)

Chih-Fan Chen (postdoc)

Guido Roberts-Borsani (postdoc)


Group Alumni:


Xuheng Ding (IPMU, Japan)

Anowar Shajib Hubble Fellow, Chicago)

Lilan Yang (IPMU, Japan)

Daniel Gilman (Toronto, CA)

Louis Abramson (Carnegie-Princeton Fellow, OCIW)

Adriano Agnello (Dark, DK)

Matthew Auger (Rutherford Fellow, Cambridge, UK)

Matteo Barnabe' (Data scientist)

Vardha Bennert (Calpoly SLO)

Simon Birrer (Kavli Fellow, Stanford)

Marusa Bradac (UC Davis)

Brendon Brewer (Auckland, NZ)

Aaron Dutton (NYU Abu Dhabi)

Elena Gallo (U Michigan)

Raphael Gavazzi (IAP Paris, F)

Tucker Jones (UC Davis)

Austin Hoag (Software developer)

Brandon Kelly (Goodyear Tire and Rubber Company)

Kai Liao (Wuhan University)

Philip Marshall (SLAC, Stanford)

Charlotte Mason (Hubble Fellow, CfA)

Xiao-Lei Meng

Takahiro Morishita (STScI)

Anna Nierenberg (NASA Fellow, JPL)

Anna Pancoast

Alessandro Sonnenfeld (Nova Fellow, Leiden, NL)

Kasper Schmidt (AIP, Potsdam)

Andreas Skielboe

Sherry Suyu (MPA, D)

Xin Wang (Caltech, US)

Jonghak Woo (SNU, Korea)


We meet every week to eat pizza and discuss our research on gravitational lensing, galaxy evolution and black holes. If you are interested in attending please e-mail me.

If you are looking for a PhD Thesis there are plenty of cool projects to work on. E-mail me if interested.


If you are a PhD Student abroad and you are interested in a visiting position in my group at UCLA feel free to contact me.



The Nature of the Universe (ASTRO3)

Life in the Universe (ASTRO5)

Introduction to Cosmology (ASTRO6)

Physics of Sustainable Energy (PHYSICS12), see pilot videos written in collaboration with Alex Kusenko here
and here

Curriculum Vitae


Publications (ADS server query sorted by citations)