Triangle Seminars
Tuesday, 4 May 2021
Cosmology as a tool to test fundamental physics
Lavinia Heisenberg
(ETH Zurich)
Abstract:
I will start by introducing the two fundamental pillars of Cosmology: General Relativity and the Cosmological Principle. General Relativity will be constructed both in the geometrical as well as in the particle physics perspective. After introducing some of the prominent effective field theories of gravity I will show how the Cosmological Principle can be realized in the different theories. I will then discuss how different theoretical consistency checks can be applied on them for their scrutiny, like conditions coming from a UV completion and quantum corrections. I will argue that we will need to combine this theoretical scrutiny program with different cosmological observations in order to disentangle between different dark energy models and test fundamental properties of gravity.
[please email a.held@imperial.ac.uk for zoom link or password]
I will start by introducing the two fundamental pillars of Cosmology: General Relativity and the Cosmological Principle. General Relativity will be constructed both in the geometrical as well as in the particle physics perspective. After introducing some of the prominent effective field theories of gravity I will show how the Cosmological Principle can be realized in the different theories. I will then discuss how different theoretical consistency checks can be applied on them for their scrutiny, like conditions coming from a UV completion and quantum corrections. I will argue that we will need to combine this theoretical scrutiny program with different cosmological observations in order to disentangle between different dark energy models and test fundamental properties of gravity.
[please email a.held@imperial.ac.uk for zoom link or password]
Posted by: IC
Wednesday, 5 May 2021
Conformal Bootstrap and Critical Phenomena
📍 London
Andreas Stergiou
(Los Alamos)
Abstract:
Renormalization group methods have been used for almost 50 years to obtain results for critical exponents of conformal field theories (CFTs), while relying on assumptions and approximations that are not rigorously justified. The agreement with experiments is good in many cases, e.g. the 3D Ising model, but disagreements between theory and experiment that have remained unresolved for decades also exist. This indicates that our understanding of critical phenomena may be incomplete. More recently, the numerical conformal bootstrap, a fully nonperturbative method, has proven to be very powerful in calculating critical exponents and other physical observables of CFTs. In this talk we will review the numerical conformal bootstrap method and discuss potential resolutions it has suggested for unsettled questions pertaining to critical phenomena in frustrated magnets and structural phase transitions.
[please email alejandro.cabo_bizet@kcl.ac.uk for the zoom link]
Renormalization group methods have been used for almost 50 years to obtain results for critical exponents of conformal field theories (CFTs), while relying on assumptions and approximations that are not rigorously justified. The agreement with experiments is good in many cases, e.g. the 3D Ising model, but disagreements between theory and experiment that have remained unresolved for decades also exist. This indicates that our understanding of critical phenomena may be incomplete. More recently, the numerical conformal bootstrap, a fully nonperturbative method, has proven to be very powerful in calculating critical exponents and other physical observables of CFTs. In this talk we will review the numerical conformal bootstrap method and discuss potential resolutions it has suggested for unsettled questions pertaining to critical phenomena in frustrated magnets and structural phase transitions.
[please email alejandro.cabo_bizet@kcl.ac.uk for the zoom link]
Posted by: andrea
Thursday, 6 May 2021
Towards a general map from Navier-Stokes to Maxwell via Einstein
Cynthia Keeler
(ASU)
Abstract:
[for zoom link please email s.nagyATqmul.ac.uk]
After a brief review of the cutoff-surface formulation of fluid-gravity duality, we explore the ``square root'' of the fluid-dual metrics via the classical-double copy, highlighting the constant vorticity flows and potential flows which have algebraically special Weyl double copy fields. We then present progress towards building the same map, from fluid solutions to gravitational solutions to Maxwell solutions, for generic fluids in 2+1 dimensions. This talk is based on JHEP 08 (2020) 147 published with ASU students Nikhil Monga and Tucker Manton, and forthcoming work.
[for zoom link please email s.nagyATqmul.ac.uk]
After a brief review of the cutoff-surface formulation of fluid-gravity duality, we explore the ``square root'' of the fluid-dual metrics via the classical-double copy, highlighting the constant vorticity flows and potential flows which have algebraically special Weyl double copy fields. We then present progress towards building the same map, from fluid solutions to gravitational solutions to Maxwell solutions, for generic fluids in 2+1 dimensions. This talk is based on JHEP 08 (2020) 147 published with ASU students Nikhil Monga and Tucker Manton, and forthcoming work.
Posted by: QMW
Current operators in integrable models (a review)
Balazs Pozsgay
(Eotvos University Budapest)
Abstract:
Current operators describe the flow of the conserved charges in integrable models. Whereas lots of information was known about the charges, surprisingly the current operators remained unexplored for a very long time. I review recent results in this topic, which include an exact finite volume formula for the mean values of the current operators, their embedding into the Quantum Inverse Scattering Approach (Algebraic Bethe Ansatz), and connections with long range deformations and TTbar deformations. –- Part of the London Integrability Journal Club. If you are a new participant, please register at integrability-london.weebly.com. The link will be emailed on Tuesday.
Current operators describe the flow of the conserved charges in integrable models. Whereas lots of information was known about the charges, surprisingly the current operators remained unexplored for a very long time. I review recent results in this topic, which include an exact finite volume formula for the mean values of the current operators, their embedding into the Quantum Inverse Scattering Approach (Algebraic Bethe Ansatz), and connections with long range deformations and TTbar deformations. –- Part of the London Integrability Journal Club. If you are a new participant, please register at integrability-london.weebly.com. The link will be emailed on Tuesday.
Posted by: andrea