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Microstructural Kinetics Group

Department of Materials Science & Metallurgy
 
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This is a superlist combining all those seminars on talks.cam taking place in one of the Departments of the School of Physical sciences, plus occasional other talks which would be of significant interest to researchers in the School. If you would like your talk or list included please contact Duncan (drs45)
Updated: 49 min 52 sec ago

Wed 09 Mar 14:30: Title to be confirmed

5 hours 45 min ago
Title to be confirmed

Abstract not available

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Wed 16 Mar 14:30: Title to be confirmed

5 hours 46 min ago
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Abstract not available

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Fri 08 Oct 13:00: Black Hole Interior

7 hours 36 min ago
Black Hole Interior

I will discuss how quantum effects affect the interior of a charged black hole—in particular their relevance for: (i) the strong cosmic censorship hypothesis, and (ii) charge and energy transport inside black holes. I will show how, near the inner horizon, quantum effects are stronger than classical ones and have highly unintuitive features.

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Wed 17 Nov 16:00: Title to be confirmed

Sun, 26/09/2021 - 21:03
Title to be confirmed

Abstract not available

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Wed 03 Nov 16:00: Title to be confirmed

Sun, 26/09/2021 - 21:03
Title to be confirmed

Abstract not available

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Wed 27 Oct 16:00: Title to be confirmed

Sun, 26/09/2021 - 21:02
Title to be confirmed

Abstract not available

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Fri 26 Nov 14:00: TBC

Wed, 22/09/2021 - 21:41
TBC

TBC

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Fri 26 Nov 14:00: TBC

Wed, 22/09/2021 - 21:37
TBC

TBC

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Fri 19 Nov 14:00: TBC

Wed, 22/09/2021 - 21:35
TBC

TBC

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Fri 05 Nov 16:00: TBC

Wed, 22/09/2021 - 21:34
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TBC

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Fri 29 Oct 16:00: TBC

Wed, 22/09/2021 - 21:33
TBC

TBC

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Fri 15 Oct 16:00: TBC

Wed, 22/09/2021 - 21:33
TBC

TBC

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Fri 08 Oct 16:00: Global testing for dependent Bernoullis

Wed, 22/09/2021 - 21:32
Global testing for dependent Bernoullis

Suppose $(X_1,\ldots,X_n)$ are independent Bernoulli random variables with $\mathbb{E}(X_i)= p_i$, and we want to test the global null hypothesis that $p_i=\frac{1}{2}$ for all $i$, versus the alternative that there is a sparse set of size $s$ on which $p_i\ge \frac{1}{2}+A$. The detection boundary of this test in terms of $(s,A)$ is well understood, both in the case when the signal is arbitrary, and when the signal is present in a segment.

We study the above questions when the Bernoullis are dependent, and the dependence is modeled by a graphical model (Ising model). In this case, contrary to what typically happens, dependence can allow detection of smaller signals than the independent case. This phenomenon happens over a wide range of graphs, for both arbitrary signals and segment signals.

This talk is based on joint work with Nabarun Deb, Rajarshi Mukherjee, and Ming Yuan

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Fri 08 Oct 16:00: Global testing for dependent Bernoullis

Wed, 22/09/2021 - 09:33
Global testing for dependent Bernoullis

Suppose $(X_1,\ldots,X_n)$ are independent Bernoulli random variables with $\mathbb{E}(X_i)= p_i$, and we want to test the global null hypothesis that $p_i=\frac{1}{2}$ for all $i$, versus the alternative that there is a sparse set of size $s$ on which $p_i\ge \frac{1}{2}+A$. The detection boundary of this test in terms of $(s,A)$ is well understood, both in the case when the signal is arbitrary, and when the signal is present in a segment.

We study the above questions when the Bernoullis are dependent, and the dependence is modeled by a graphical model (Ising model). In this case, contrary to what typically happens, dependence can allow detection of smaller signals than the independent case. This phenomenon happens over a wide range of graphs, for both arbitrary signals and segment signals.

This talk is based on joint work with Nabarun Deb, Rajarshi Mukherjee, and Ming Yuan

  • Speaker: Sumit Mukherjee (Columbia University)
  • Friday 08 October 2021, 16:00-17:00
  • Venue: Zoom.
  • Series: Statistics; organiser: Qingyuan Zhao.

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Wed 10 Nov 16:00: Symplectic cohomology of compound du Val singularities

Tue, 21/09/2021 - 22:28
Symplectic cohomology of compound du Val singularities

If someone gives you a variety with a singular point, you can try and get some understanding of what the singularity looks like by taking its “link”, that is you take the boundary of a neighbourhood of the singular point. For example, the link of the complex plane curve with a cusp is a trefoil knot in the 3-sphere. I want to talk about the links of a class of 3-fold singularities which come up in Mori theory: the compound Du Val (cDV) singularities. These links are 5-dimensional manifolds. It turns out that many cDV singularities have the same 5-manifold as their link, and to tell them apart you need to keep track of some extra structure (a contact structure). In joint work with Y. Lekili, we use symplectic cohomology to distinguish the contact structures on many these links.

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Wed 10 Nov 16:00: Symplectic cohomology of compound du Val singularities

Tue, 21/09/2021 - 22:28
Symplectic cohomology of compound du Val singularities

If someone gives you a variety with a singular point, you can try and get some understanding of what the singularity looks like by taking its “link”, that is you take the boundary of a neighbourhood of the singular point. For example, the link of the complex plane curve with a cusp y2 = x3 is a trefoil knot in the 3-sphere. I want to talk about the links of a class of 3-fold singularities which come up in Mori theory: the compound Du Val (cDV) singularities. These links are 5-dimensional manifolds. It turns out that many cDV singularities have the same 5-manifold as their link, and to tell them apart you need to keep track of some extra structure (a contact structure). In joint work with Y. Lekili, we use symplectic cohomology to distinguish the contact structures on many these links.

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Wed 24 Nov 14:30: Title to be confirmed

Tue, 21/09/2021 - 12:59
Title to be confirmed

Abstract not available

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Wed 17 Nov 15:00: Title to be confirmed First Year PhD Report

Tue, 21/09/2021 - 12:55
Title to be confirmed

Abstract not available

First Year PhD Report

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Wed 17 Nov 14:30: Title to be confirmed First Year PhD Report

Tue, 21/09/2021 - 12:52
Title to be confirmed

Abstract not available

First Year PhD Report

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Wed 10 Nov 15:00: Title to be confirmed First Year PhD Report

Tue, 21/09/2021 - 12:50
Title to be confirmed

Abstract not available

First Year PhD Report

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