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X-WR-CALNAME;VALUE=TEXT:Department of Physics
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TZID:America/New_York
BEGIN:STANDARD
DTSTART:20201101T020000
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
RDATE:20211107T020000
TZNAME:EST
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BEGIN:DAYLIGHT
DTSTART:20210314T020000
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
TZNAME:EDT
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BEGIN:VEVENT
UID:calendar.12331.field_events_date.2@phy.princeton.edu
DTSTAMP:20210512T200520Z
CREATED:20201208T155229Z
DESCRIPTION:Required\, but free registration is now open on line at: http:/
/pcts.princeton.edu/programs/current/polarized-radiation-near-supermassive
-black-holes/141\n\nEmission from astrophysical black hole sources is sens
itive to the spacetime and plasma properties in these regions. In particul
ar\, images of the polarized emission around the supermassive black holes
Sagittarius A* and M87* captured by the Event Horizon Telescope (EHT) will
add significant information to existing images in total intensity. Polari
zed images will be powerful tools for constraining the near-horizon magnet
ic field structure\, probing plasma composition and dynamics\, and testing
General Relativity near supermassive black holes. This workshop will brin
g together experts in accretion physics\, relativity\, and plasma physics
in an attempt to share information across disciplines and develop new idea
s for understanding the environment just outside the black hole event hori
zon using polarized light.
DTSTART;VALUE=DATE:20210512
DTEND;VALUE=DATE:20210513
LAST-MODIFIED:20201208T155229Z
LOCATION:Zoom
RRULE:FREQ=DAILY;COUNT=4;INTERVAL=1;WKST=SU
SUMMARY:PCTS: Polarized Radiation from Supermassive Black Holes
URL;TYPE=URI:https://phy.princeton.edu/events/pcts-polarized-radiation-supe
rmassive-black-holes
END:VEVENT
BEGIN:VEVENT
UID:calendar.12906.field_events_date.0@phy.princeton.edu
DTSTAMP:20210512T200520Z
CATEGORIES:FPO
CREATED:20210504T143900Z
DESCRIPTION:Phases of matter are splendid\, and get more complicated from p
hysical systems to biochemical systems. Simple physics principles are prop
osed to categorise various phases of matter. The phys- ical principles are
often exemplified by simple idealised models. When they are applied to mo
re complicated biochemical systems\, some generalisations may be needed.\n
\nIn this thesis\, two idealised models\, dipolar dimer liquid and topolog
ical metamaterials with odd elasticity\, are discussed. The first model\,
Dipolar Dimer Liquid (DDL)\, is motivated by water. It is a simplified mod
el consisting of dipolar dimers on lattice with a Coulombic interaction be
tween the dimers. The Coulombic interaction is an idealised model for the
hydrogen bond interaction. It is found that there exists a liquid-liquid p
hase transition in this model. To understand this phase transition\, an ex
act mapping from the DDL to the annealed Ising model on random graphs has
been constructed. Consequently\, one may identify the order parameter char
actering the liquid-liquid phase transition of the DDL with the order para
meter of the Ising model\, magnetisation. One may further bound the critic
al temperature with the help of this exact mapping and the exactly solved
Ising models in 2D. The estimation of the critical temperature has been co
nfirmed by the numerical simulations. A quantum generalisation of the DDL
has also been proposed. Interesting interplay of the Coulombic interaction
and the quantum solid-liquid transition is discussed.\n\nThe second model
is motivated by active matters. In the presence of active energy pumping\
, a strange stress response\, the odd elasticity\, is admissible. In our m
odel\, the odd elasticity comes from an idealised model of metabeams\, and
the dynamics of the system becomes non-Hermitian. Interestingly\, the top
ological properties still survive in the non-Hermitian dynamics. But the b
ulk modes also become exponentially localised\, which is called non-Hermit
ian skin eﬀect. To characterise the topological properties\, the definitio
n of the Brillouin zone has been generalised\, and the definition of the Z
ak-Berry phase has been clarified for the non-Hermitian systems. The 1D ro
tor chain and 2D rotor lattice have been discussed in detail as demonstrat
ing examples.
DTSTART;TZID=America/New_York:20210512T100000
DTEND;TZID=America/New_York:20210512T100000
LAST-MODIFIED:20210504T144319Z
LOCATION:Zoom Meeting ID: 963 2391 5924\, Passcode:652968
SUMMARY:FPO - Junyi Zhang - 'Study of Phases of Matter: Dipolar Dimer Liqui
d and Topological Metamaterials with Odd Elasticity'
URL;TYPE=URI:https://phy.princeton.edu/events/fpo-junyi-zhang-study-phases-
matter-dipolar-dimer-liquid-and-topological-metamaterials-odd
END:VEVENT
BEGIN:VEVENT
UID:calendar.12916.field_events_date.0@phy.princeton.edu
DTSTAMP:20210512T200520Z
CATEGORIES:FPO
CREATED:20210506T185049Z
DESCRIPTION:In this thesis we study N = 6 superconformal field theories (SC
FTs) in three dimensions. Such theories are highly constrained by supersym
metry\, allowing many quantities to be computed exactly. Yet though constr
ained\, N = 6 SCFTs still exhibit a rich array of behaviors\, and in vario
us regimes can be dual holographically to M-theory on AdS4 ×S7\, IIA strin
g theory on AdS4 ×CP3\, and higher- spin gravity on AdS4. We will use tool
s from conformal bootstrap and supersymmetric localization to study N = 6
theories\, both in general and in holographic regimes.\n\nWe begin in Chap
ter 2 by deriving the supersymmetric Ward identities and the superconforma
l block expansion for the four-point correlator ⟨SSSS⟩ of stress tensor mu
ltiplet scalars S. Chapter 3 then studies the mass-deformed sphere partiti
on function\, which can be computed exactly using supersymmetric localizat
ion\, and relates derivatives of this quantity to specific integrals of ⟨S
SSS⟩.\n\nIn Chapter 4 we study the IIA string and M-theory limits of the A
BJ family of N = 6 SCFTs. Using the supersymmetric Ward identities and loc
alization results\, we are able to fully determine the R4 corrections to t
he ⟨SSSS⟩ correlator in both limits. By taking the flat space limit\, we c
an compare to the known R4 contribution to the IIA and M-theory S-matrix\,
allowing us to perform a check of AdS/CFT at finite string coupling.\n\nI
n Chapter 5 we study the higher-spin limit of N = 6 theories. Using the we
akly broken higher- spin Ward identity\, we completely determine the leadi
ng correction to ⟨SSSS⟩ in this limit up to two free parameters\, which fo
r ABJ theory we then fix using localization. Finally\, in Chapter 6 we per
form the first numerical bootstrap study of N = 6 superconformal field the
ories\, allowing us to derive non-perturbative bounds on the CFT data cont
ributing to ⟨SSSS⟩.
DTSTART;TZID=America/New_York:20210514T100000
DTEND;TZID=America/New_York:20210514T100000
LAST-MODIFIED:20210506T185049Z
LOCATION:Zoom Meeting ID: 988 6735 9417\, Passcode 500433
SUMMARY:FPO - Damon Binder - On N=6 Superconformal Field Theories
URL;TYPE=URI:https://phy.princeton.edu/events/fpo-damon-binder-n6-superconf
ormal-field-theories
END:VEVENT
BEGIN:VEVENT
UID:calendar.12576.field_events_date.0@phy.princeton.edu
DTSTAMP:20210512T200520Z
CREATED:20210203T173800Z
DESCRIPTION:To join HET Seminar please click link below:\n\nhttps://princet
on.zoom.us/j/98595504817?pwd=QWxDMzFGWjdBdmVBRTFyQmtvajVNQT09\n\nMeeting I
D: 985 9550 4817\n\nAbstract: Classical error correcting codes are related
to special lattices\, which give rise to chiral CFTs. Recently this story
was generalized to non-chiral theories. In this case quantum codes give r
ise to Narain lattices and a special family of Narain theories which we du
b code CFTs. Some of these theories maximize the spectral gap\, making con
nection with the conformal bootstrap program. From the holographic point o
f view\, code CFTs form an ensemble which provides a simplified model for
the recently introduced duality between ensembles of boundary theories and
quantum gravity in the bulk. In this talk I will first describe the mappi
ng between quantum codes and Narain theories\, and then briefly discuss ex
amples of optimal CFTs which maximize the spectral gap. In the second part
of the talk I will discuss the ensemble of code theories and several less
ons they teach us about the ensemble of all Narain theories and its hologr
aphic description.
DTSTART;TZID=America/New_York:20210514T134500
DTEND;TZID=America/New_York:20210514T134500
LAST-MODIFIED:20210509T162724Z
SUMMARY:HET Seminar | Anatoly Dymarsky\, University of Kentucky | 'Quantum
codes\, conformal field theories\, and holography' | via Zoom
URL;TYPE=URI:https://phy.princeton.edu/events/het-seminar-anatoly-dymarsky-
university-kentucky-quantum-codes-conformal-field-theories-and
END:VEVENT
BEGIN:VEVENT
UID:calendar.12761.field_events_date.0@phy.princeton.edu
DTSTAMP:20210512T200520Z
CREATED:20210305T183700Z
DESCRIPTION:To connect to the HET Seminar via Zoom\, please click the follo
wing link:\n \n https://theias.zoom.us/j/83432499354?pwd=TkhMZWFJK2E1UzRyeUp
pU01pZVQwUT09\n \n Abstract: This is joint work with Clément Dupont. Motivat
ed by double-copy (Kawai-Lewellen-Tye) formulae relating open and closed
superstring amplitudes at tree-level\, I will explain a general double-cop
y formula for period integrals on algebraic varieties and its relation to
single-valued functions. As an application\, we deduce a conjecture of Sti
eberger which states that the passage from open to closed amplitudes in st
ring perturbation theory at genus zero is given by the so-called single-va
lued map.
DTSTART;TZID=America/New_York:20210517T143000
DTEND;TZID=America/New_York:20210517T143000
LAST-MODIFIED:20210510T202830Z
LOCATION:via Zoom
SUMMARY:HET Seminar | Francis Brown\, Oxford University | 'Superstring Ampl
itudes in Genus 0 and Double Copy' | via Zoom
URL;TYPE=URI:https://phy.princeton.edu/events/het-seminar-francis-brown-oxf
ord-university-superstring-amplitudes-genus-0-and-double-copy
END:VEVENT
BEGIN:VEVENT
UID:calendar.12641.field_events_date.0@phy.princeton.edu
DTSTAMP:20210512T200520Z
CATEGORIES:Condensed Matter Seminar
CREATED:20210210T162200Z
DESCRIPTION:I will describe experiments probing magnetic states based on th
e spontaneous alignment of electron orbitals. Such orbital ferromagnetism
may be a generic phenomena\, but has\, to date\, found its fullest express
ion in graphene heterostructures in which the two dimensional orbits of el
ectrons in distinct momentum space valleys provide the underlying degree o
f freedom. As an elementary example I will show data from rhombohedral tri
layer graphene\, where band edge van Hove singularities lead to a cascade
of transitions between metallic ferromagnetic states distinguished by diff
erent broken valley and spin symmetries. Adding a moire potential to the
trilayer by hBN alignment allows for energy gaps at finite density when th
e underlying degeneracy of the Fermi surface matches the superlattice fill
ing factor. Because orbital degrees of freedom arise directly from the b
and wavefunctions\, they are uniquely susceptible to experimental control
via materials design and in situ knobs. I will show examples from a variet
y of heterostructures where magnetic moments\, and in some cases the resul
ting quantized anomalous Hall effects\, can be tuned using electric curren
ts and the electric field effect. Finally\, I will conclude with an outloo
k for realizing more exotic topological phases of matter based on orbital
magnetism.
DTSTART;TZID=America/New_York:20210519T140000
DTEND;TZID=America/New_York:20210519T140000
LAST-MODIFIED:20210512T141018Z
LOCATION:https://princeton.zoom.us/j/97349819732
SUMMARY:Condensed Matter Zoom Seminar | Andrea Young\, UCSB | 'Orbital magn
etism in graphene heterostructures'
URL;TYPE=URI:https://phy.princeton.edu/events/condensed-matter-zoom-seminar
-andrea-young-ucsb-orbital-magnetism-graphene-heterostructures
END:VEVENT
BEGIN:VEVENT
UID:calendar.12901.field_events_date.0@phy.princeton.edu
DTSTAMP:20210512T200520Z
CATEGORIES:Special Event
CREATED:20210503T185900Z
DESCRIPTION:For more information and Zoom information\, please contact Regi
na Savadge rsavadge@princeton.edu
DTSTART;TZID=America/New_York:20210521T163000
DTEND;TZID=America/New_York:20210521T163000
LAST-MODIFIED:20210503T185914Z
LOCATION:Via Zoom
SUMMARY:Reunion event
URL;TYPE=URI:https://phy.princeton.edu/events/reunion-event
END:VEVENT
BEGIN:VEVENT
UID:calendar.12646.field_events_date.0@phy.princeton.edu
DTSTAMP:20210512T200520Z
CATEGORIES:Condensed Matter Seminar
CREATED:20210210T162400Z
DESCRIPTION:Duality transformations have played a major role in our modern
understanding of quantum phenomena. In 3 spacetime dimensions\, familiar
examples of duality transformations include 1) Goldstone modes of the XY m
odel being dual to a photon\, and 2) dualities involving statistical trans
mutation. It has become clear recently that both of these examples are me
mbers of a broader 'web' of dualities. I will discuss this duality web us
ing Euclidean lattice constructions\, exact transformations of partition f
unctions\, and numerical simulations.
DTSTART;TZID=America/New_York:20210526T140000
DTEND;TZID=America/New_York:20210526T140000
LAST-MODIFIED:20210512T144809Z
LOCATION:https://princeton.zoom.us/j/97349819732
SUMMARY:Condensed Matter Zoom Seminar | Srinivas Raghu\, Stanford | 'Lattic
e constructions of a web of dualities in 3 spacetime dimensions'
URL;TYPE=URI:https://phy.princeton.edu/events/condensed-matter-zoom-seminar
-srinivas-raghu-stanford-lattice-constructions-web-dualities-3
END:VEVENT
BEGIN:VEVENT
UID:calendar.12911.field_events_date.0@phy.princeton.edu
DTSTAMP:20210512T200520Z
CATEGORIES:Equity Diversity and Inclusion Initiative
CREATED:20210506T144639Z
DESCRIPTION:All working groups will present ~5-10 minutes of updates on the
ir ongoing projects. We're looking forward to seeing you all then!\n (Zoom
link will be sent via departmental email and the EDI Slack channel.)\n
DTSTART;TZID=America/New_York:20210526T150000
DTEND;TZID=America/New_York:20210526T150000
LAST-MODIFIED:20210506T144639Z
SUMMARY:EDI initiative 'All Hands' meeting
URL;TYPE=URI:https://phy.princeton.edu/events/edi-initiative-all-hands-meet
ing-1
END:VEVENT
END:VCALENDAR