1. Some BIG IDEAS from summer conferences 1)The emergence of space 2)A model for quarks, leptons, gauge bosons 3)All particles in one representation –E 8 4)Photons emerging from non-gauge interactions

2. Supersymmetry Grand Unification Baryogenesis Technicolor Kaluza Klein String Theory Inflation Multiverse Branes Large Extra Dimensions Conferences are often the place to spread new ideas There have not been many big ideas lately at regular conferences

7. The emergence of space “Quantum graphity” Fotini Markopoulou - Perimeter Basic idea: - think of spacetime as a lattice of points -endowed with a Hamiltonian - maximally connected space - at low energy, Minkowski space emerges New idea for cosmology, locality etc

16. Phenomenology of locality: Locality, causality are properties of all regular QFTs - but could be violated in some theories Gravity: -distances subject to quantum fluctuations - violation should be 1/M P+ suppressed Branes: Fotini’s space: - major violations possible - black hole example

17. A model for all the particles and interactions Sundance Bilson-Thompson - Perimeter Basic idea: - like composite models – what makes up quarks etc - novel outlook – maybe also explains interactions

32. Problems: - no right handed neutrino - need Majorana mass, Higgs triplet - no Higgs so far - gravity missing (but may be part of LQG) Potential promise: - rationale for the world that we see - reframes the problems But a lot left to do - math of braided networks

33. All the particles in one representation Garrett Lisi - FQXi Basic idea: - in genre of finding a unified theory - everything (including gravity) fits in one rep of E 8

43. Wen will give seminar here Friday Oct 26

48. Hopes and goals: - perhaps describe all interactions as “emergent” - logical way to build a finite theory - Wen also has paper on emergent gravity Problems: - no chiral fermions yet - Weinberg Witten theorem for gravity?? - no Higgs

49. Some BIG IDEAS from summer conferences 1)The emergence of space 2)A model for quarks, leptons, gauge bosons 3)All particles in one representation –E 8 4)Photons emerging from non-gauge interactions