Department Calendar

Monday, December 4, 2017

Time Items
All day
 
2pm
"Bit threads and holographic entanglement"

"Bit threads and holographic entanglement"

Date: 
Mon, 12/04/2017 - 2:10pm
Location: 
Pupin Hall Theory Center, 8th Floor

Matt Headrick

Brandeis University

"Bit threads and holographic entanglement"

The by-now classic Ryu-Takayanagi formula associates the entanglement entropy of a spatial region in a holographic field theory with the area of a certain minimal surface in the bulk. As I will explain, despite its simplicity and beauty, this formula raises a number of stubborn conceptual problems. I will present a reformulation that does not involve the areas of surfaces, and that leads to a picture of entanglement in the field theory being carried by Planck-thickness "bit threads" in the bulk. I will argue that this picture helps to resolve a number of the conceptual difficulties surrounding the RT formula, and that it illuminates the special entanglement structure of holographic systems.

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12/04/2017 - 2:10pm
 
4pm
"Neutrinos, Quintessence and Structure Formation in the Universe"

"Neutrinos, Quintessence and Structure Formation in the Universe"

Date: 
Mon, 12/04/2017 - 4:15pm
Location: 
428 Pupin Hall

Marilena Loverde

Stony Brook University

"Neutrinos, Quintessence and Structure Formation in the Universe"

The large-scale structure of our universe (the distribution of galaxies on very large-scales for instance) contains a wealth of information about the origin, evolution, and matter content of the universe. Extracting this information relies crucially on understanding how galaxies and other biased objects trace the large-scale matter distribution. In a universe such as our own, with both cold dark matter and massive neutrinos, or in alternative cosmologies with clustered quintessence, this problem is much more complicated. I will discuss new tools that my group has developed to study gravitational evolution in cosmologies with multiple fluids, the novel signatures we have identified including a new probe of neutrino mass, and the broader implications for models of large-scale structure. 

About the speaker

Marilena Loverde is an Assistant Professor in the C. N. Yang Institute for Theoretical Physics and the Department of Physics and Astronomy at Stony Brook University.  She did her undergraduate studies at the University of California, Berkeley and earned her PhD at Columbia University.  Following her PhD Marilena spent time as a post doc at the Kavli Institute for Cosmological Physics at the University of Chicago and at the Institute for Advanced Study in Princeton. 

Marilena's research is in theoretical cosmology, broadly interested in developing tools to use observations of galaxies and the cosmic microwave background to learn about the origin and evolution of the universe. She has spent a lot of time thinking about: weak gravitational lensing, primordial non-Gaussianity as a test of inflation, and the cosmic neutrino backround. Currently, Marilena's research focuses on the massive cosmic neutrino background and structure formation.

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12/04/2017 - 4:15pm
 
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