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TZID:Australia/Sydney
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TZID:Australia/Sydney
X-LIC-LOCATION:Australia/Sydney
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TZOFFSETFROM:+1000
TZOFFSETTO:+1100
TZNAME:AEDT
DTSTART:19700308T020000
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DTSTART:19701101T020000
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210830T180000
DTEND;TZID=Australia/Sydney:20210830T190000
SUMMARY:Symmetry in Newcastle\n "Constructing groups with flat-rank greater than $1$"\n ARC Laureate Fellow Prof. George Willis
LOCATION:
DESCRIPTION:Symmetry in Newcastle\n\n"Constructing groups with flat-rank greater than $1$"\nARC Laureate Fellow Prof. George Willis\n\nAbstract:\nThe contraction subgroup for $x$ in the locally compact group, $G$, $\mathrm{con}(x) = \left\{ g\in G \mid x^ngx^{-n} \to 1\text{ as }n\to\infty \right\}$, and the Levi subgroup is $\mathrm{lev}(x) = \left\{ g\in G \mid \{x^ngx^{-n}\}_{n\in\mathbb{Z}} \text{ has compact closure}\right\}$. The following will be shown.\nLet $G$ be a totally disconnected, locally compact group and $x\in G$. Let $y\in{\sf lev}(x)$. Then there are $x'\in G$ and a compact subgroup, $K\leq G$ such that: \n -$K$ is normalised by $x'$ and $y$, \n -$\mathrm{con}(x') = \mathrm{con}(x)$ and $\mathrm{lev}(x') = \mathrm{lev}(x)$ and \n -the group $\langle x',y,K\rangle$ is abelian modulo $K$, and hence flat. \nIf no compact open subgroup of $G$ normalised by $x$ and no compact open subgroup of $\mathrm{lev}(x)$ normalised by $y$, then the flat-rank of $\langle x',y,K\rangle$ is equal to $2$.
UID:1243
SEQUENCE:0
DTSTAMP;TZID=Australia/Sydney:20210829T153317
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DTSTART;TZID=Australia/Sydney:20210903T120000
DTEND;TZID=Australia/Sydney:20210903T130000
SUMMARY:CARMA Colloquium\n "Understanding the emergence of magnetic active regions on the Sun Date: Friday 3rd September"\n Dr Hannah Schunker
LOCATION:
DESCRIPTION:CARMA Colloquium\n\nJoin us via ZOOM.\n\n"Understanding the emergence of magnetic active regions on the Sun Date: Friday 3rd September"\nDr Hannah Schunker\n\nAbstract:\nSpace weather events are associated with strong concentrations of magnetic field on the surface of the Sun. Currently, only low-fidelity space-weather forecasts are possible. Predicting the emergence time and size of the Sun’s active regions would be a significant step forward for space weather forecasting. The physics behind how these active regions emerge from the interior to the surface of the Sun is poorly understood. Only since the advent of a space-based monitoring campaign has it been possible to capture the emergence process of the magnetic field, Doppler velocity and intensity continuum of hundreds of active regions. By measuring the average motion of the polarities, surface velocities and pattern of convection, it is clear that convection plays an important role in the emergence of magnetic field on the Sun. Using machine learning and sophisticated simulations we aim to identify the convection cell dynamics associated with the emergence process, moving towards improved space weather forecasting.
UID:1241
SEQUENCE:0
DTSTAMP;TZID=Australia/Sydney:20210825T162036
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210909T160000
DTEND;TZID=Australia/Sydney:20210909T170000
SUMMARY:CARMA Colloquium\n "Magnetic field dynamics in highly conducting plasmas"\n A/Prof. David Pontin
LOCATION:
DESCRIPTION:CARMA Colloquium\n\nJoin us via ZOOM\n\n"Magnetic field dynamics in highly conducting plasmas"\nA/Prof. David Pontin\n\nAbstract:\nMany astrophysical and laboratory plasmas have a very high conductivity. In the limit of infinite conductivity the magnetic field is “frozen” to the plasma, and consequently the magnetic field topology (defined by the connectivity and linkage of the field lines) is preserved. A breakdown in this “ideal” behaviour permits “magnetic reconnection” to occur, which is behind explosive energy release processes such as solar flare and sawtooth crashes in tokamaks. There exist analogous processes in high Reynolds number fluids and superfluids. Here I will develop the mathematical basis for understanding these concepts. I will also provide some illustrative examples of the importance of characterising magnetic complexity in determining where and how magnetic reconnection occurs.
UID:1242
SEQUENCE:0
DTSTAMP;TZID=Australia/Sydney:20210825T162316
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210920T090000
DTEND;TZID=Australia/Sydney:20210921T170000
SUMMARY:CARMA Symposium "Indigenising University Mathematics"
LOCATION:Birabahn building of the Wollotuka Institute
DESCRIPTION:CARMA Symposium\nBirabahn building of the Wollotuka Institute\nIndigenising University Mathematics\n\nRegister now at Eventbrite\nThe conference website is here.\nThis national and international two-day symposium will address the pressing challenge of how to Indigenise mathematical practice at Universities, both in education and research. The methodology is of collaboration and sharing of knowledge and worldviews from within both Indigenous cultures and the cultures of mathematics and its allied disciplines.
UID:1225
SEQUENCE:0
DTSTAMP;TZID=Australia/Sydney:20210328T104742
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210927T163000
DTEND;TZID=Australia/Sydney:20210927T190000
SUMMARY:Symmetry in Newcastle
LOCATION:
DESCRIPTION:Symmetry in Newcastle\n\n\n\n\nSchedule (Zoom): \n\n16.30-17.30: Siegfried Echterhoff \n17.30-18.00: Break \n18.00-19.00: Tim de Laat\n\n\n\n\n"Amenable group actions on $C^{\ast}$-algebras and the weak containment problem"\nProf. Siegfried Echterhoff\n\nAbstract:\nThe notion of amenable actions by discrete groups on $C^{\ast}$-algebras has been introduced by Claire Amantharaman-Delaroche more than thirty years ago, and has become a well understood theory with many applications. So it is somewhat surprising that an established theory of amenable actions by general locally compact groups has been missed for a very long time. We now present a theory which extends the discrete case and unifies several notions of approximation properties of actions which have been discussed in the literature. We also discuss the weak containment problem which asks wether an action $\alpha:G\to\mathrm{Aut}(A)$ is amenable if and only if the maximal and reduced crossed products coincide.\nIn this lecture we report on joint work with Alcides Buss and Rufus Willett.\n\n\n"Gelfand pairs, spherical functions and exotic group $C^{\ast}$-algebras"\nProf. Tim de Laat\n\nAbstract:\nFor a non-amenable group $G$, there can be many group $C^{\ast}$-algebras that lie naturally between the universal and the reduced $C^{\ast}$-algebra of $G$. These are called exotic group $C^{\ast}$-algebras. After a short introduction, I will explain that if $G$ is a simple Lie group or an appropriate locally compact group acting on a tree, the $L^p$-integrability properties of different spherical functions on $G$ (relative to a maximal compact subgroup) can be used to distinguish between exotic group $C^{\ast}$-algebras. This recovers results of Samei and Wiersma. Additionally, I will explain that under certain natural assumptions, the aforementioned exotic group $C^{\ast}$-algebras are the only ones coming from $G$-invariant ideals in the Fourier-Stieltjes algebra of $G$.\n\nThis is based on joint work with Dennis Heinig and Timo Siebenand.\n\n
UID:1245
SEQUENCE:0
DTSTAMP;TZID=Australia/Sydney:20210922T092936
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20211207T090000
DTEND;TZID=Australia/Sydney:20211210T170000
SUMMARY:CARMA Conference "65th Annual Meeting of the Australian Mathematical Society"
LOCATION:
DESCRIPTION:CARMA Conference\n\n65th Annual Meeting of the Australian Mathematical Society\n\nThe 65th Annual Meeting of the Australian Mathematical Society will be hosted, online, by CARMA and the School of Information and Physical Sciences. Please visit the conference web page for more information.
UID:1244
SEQUENCE:0
DTSTAMP;TZID=Australia/Sydney:20210830T145413
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