Photo Gallery: Amplitudes Summer School 2018

Amplitudes Summer School 2018 was held at the Center for Quantum Mathematics and Physics (QMAP), University of California, Davis on June 11-15, 2018. We had nearly 100 participants coming for a week of lectures on new developments in theoretical exploration of scattering amplitudes.

Before the start

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Monday, 8:30am, the registration startsLecture room and camera setupFirst lecture starts

Lectures

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Lance Dixon introduces Yutin HuangYutin provides an introduction to scattering amplitudesBCFW recursion relations is a golden standard

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All lectures are recorded and later posted on youtubeParticipants were engaged the whole weekBreaks provided a good opportunity to ask additional questions

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Zvi Bern lectures on color-kinematics duality and double copyGraviton amplitudes are there squares of gluonic amplitudesThis was proven at the tree-level but it also works at loop level

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Eric D'Hoker gave lectures on string amplitudeModular graph functions play important role in recent progressAlbert Schwarz asks questions after the lecture

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Jacob Bourjaily lectured on Vernicular of S-matrixThis included discussion of mathematics of on-shell diagramsJake also gave the tutorial on Mathematica implementation

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Claude Duhr gave lectures on integrals and symbolsHe discussed polylgarithms which arise in loop amplitudesHopf algebras appear in this context

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Song He's lectures focused on scattering equationsCHY formula calculates tree-level amplitudes in variety of theoriesThe loop extension is an active area of research

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Alex Postnikov talks about the positive GrassmannianAlex is an algebraic combinatorist who discovered this subject As it turns out it plays an important role in scattering amplitudes

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Gong show starts: Cameron Langer talks about the AmplituhedronGongwang Yan speaks about the CHY and Associahedron Izzy Nicholson describes spinor helicity formalism in GR

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Sebastian Mizera's talk on new formula for amplitudes in 6dHadleigh Frost spoke about biadjoint scalar amplitudesTalk by Mariana Gonzalez. There were 40 speakers in the gong show

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Staff appreciation

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Lunch was provided outside the lecture roomNice seating allowed prolonged lunch discussionsThe shade was very welcome in the hot California weather

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Thanks to our great staff for the help with organization And making sure everything runs smoothlyFrom left: Cindy Choi, Matthew Silver, Joann Pyon and Tina Denena
(+ absent Sarah Driver, Malina Gillies-Doherty and Alla Savrasova)

Discussions

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Nima day

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Last day we had series of lectures by Nima Arkani-Hamed9am: The topic of the first lecture is projective geometryThis concept plays an important role in the amplitudes program

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Projective geometry should be thought in the elementary schoolBut there is never late to start to think projectivelyThe lecture takes 3 hours and covers all basic topics

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1:30pm: Nima is giving a colloquium "Future of particle physics"Nima explains motivations to build 100 TeV colliderThe lecture is one hour, questions take another hour

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Discussion continues after the colloquium4pm: Nima continues to lecture, now on AmplituhedronThis is a new geometric picture for amplitudes in N=4 SYM theory

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The crucial ingredient is a logarithmic form7pm: After-dinner lecture starts Topic is a new formalism for massive amplitudes

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This can be very useful for Standard model calculationsMost participants keep focused and engagedNot feeling tired after the week of intense lectures

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It is getting dark outsideCoffee breaks and discussions move inside10pm: New lecture starts after the break

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Nima explains the significance of the dual AmplituhedronWild speculations link it to new picture for string theoryThis is a very ambitious idea which attracts attention

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Discussions continue during the coffee break12am: Nima starts next lecture, topic is "Cosmological polytopes"They describe cosmological correlation functions

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And contain scattering amplitudesOnly a subset of participants made it to this pointincluding Akshay Yeleshpur .....

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..... Minshan Zheng ....and Cameron Langer who is still recordingOne of the speakers Song He is also paying attention

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3am: Nima finishes with Q&A on Naturalness3:10am: Final picture with participants who made it till the endNima needs to catch his taxi to the airport at 4am.

Group photo