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DTSTART;TZID=America/New_York:20261005T163000
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SUMMARY:Spectral Methods for signal recovery in multi-modal problems
DESCRIPTION:Colloquium \nSpeaker: Subhabrata Sen\, Harvard Statistics \nTitle: Spectral Methods for signal recovery in multi-modal problems \nAbstract: Motivated by multi-modal estimation\, we will study a multi-view spiked random matrix model in which several noisy matrix observations contain correlated spikes. We will introduce a new spectral method for signal recovery in this setting and characterize the behavior of the top eigenvalue and the associated eigenvector. Our results will identify the sharp threshold for signal recovery in this problem. We will discuss broader implications for multi-modal data analysis. \nBased on joint work with Xiaodong Yang and Yue M. Lu. \n  \n\nTo subscribe or unsubscribe to the colloquium mailing list\, please visit this link.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/colloquium_10526/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/png:https://live-hu-cmsa-222.pantheonsite.io/media/2026/07/CMSA-Colloquium-10.5.2026.docx-scaled.png
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DTSTART;TZID=America/New_York:20260928T163000
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DTSTAMP:20260910T172424Z
CREATED:20260729T184451Z
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UID:10003982-1790613000-1790616600@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Life on a Noisy Seascape: Extinction\, Growth\, and Diversity
DESCRIPTION:Colloquium \nSpeaker: Mehran Kardar\, MIT \nTitle: Life on a Noisy Seascape: Extinction\, Growth\, and Diversity \nAbstract: Populations and communities rarely evolve in static environments; their fitness landscapes fluctuate across space and time\, forming what may be called a noisy seascape. This talk examines how such variability modifies classical models of population dynamics and community stability. Beginning from the logistic equation\, I will show how spatiotemporal fluctuations in fitness lead naturally to power-law population statistics and\, under certain conditions\, to the empirical (fractional) Richards growth law. Extending these ideas to interacting species reveals that the combined effects of dispersal and environmental noise can stabilize large\, diverse communities despite strong competitive interactions. The resulting framework connects extinction\, growth\, and coexistence within a unified view of life on a noisy seascape. \n\nTo subscribe or unsubscribe to the colloquium mailing list\, please visit this link. \n 
URL:https://live-hu-cmsa-222.pantheonsite.io/event/colloquium_92826/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/png:https://live-hu-cmsa-222.pantheonsite.io/media/CMSA-Colloquium-9.28.2026.docx-scaled.png
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