The University of Southampton

- Event

Date:
27th of January, 2023  @  13:00 - 14:15
Venue:
46/5081 and on Teams

Event details

​We study an infinite family of Massive Type IIA backgrounds that holographically describe the twisted compactification of N=(1,0) six-dimensional SCFTs to four dimensions. The analysis of the branes involved suggests a four dimensional linear quiver QFT, that deconstructs the theory in six dimensions. For the case in which the system reaches a strongly coupled fixed point, we calculate some observables that we compare with holographic results. Two quantities measuring the number of degrees of freedom for the flow across dimensions are studied.

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- Event

Date:
18th of May, 2023  @  13:00 - 14:00
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- Event

Date:
9th of February, 2023  @  13:00 - 14:00
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- Event

Date:
26th of January, 2023  @  13:00 - 14:00
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- Event

Date:
10th of February, 2023  @  13:00 - 14:15
Venue:
46/5081 and on Teams

Event details

​𝑉_{𝑢𝑏} is the smallest and least known of all CKM matrix elements; it's currently determined primarily through the exclusive process B \to \pi \ell \bar{
u}. I will present progress toward a lattice QCD determination of the 𝑉_{𝑢𝑏}​ matrix element from a novel transition -- the B \to \pi \pi \ell \bar{
u} process, where the π π system is in a P-wave and features the \rho(770) resonance as an enhancement. The calculation is performed an ensemble with 𝑁_𝑓=2+1 isotropic clover fermions wiht 𝐿≈3.6 fm and a pion mass of 320 MeV; for the b-quark we use the anisotropic clover action. After a brief overview of the theoretical framework, I will discuss some preliminary results.

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- Event

Date:
20th of January, 2023  @  13:00 - 14:15
Venue:
46/5081 and on Teams

Event details

I will discuss how cutting-edge amplitudes methods can be applied to the study of classical binary dynamics in general relativity relevant to gravitational wave physics. After a more general overview I will introduce the heavy mass effective field theory (HEFT) as an efficient implementation of these ideas to compute the classical deflection angle and waveforms in GR. I will also describe a novel version of the color-kinematics duality for amplitudes in HEFT and Yang-Mills and discuss its underlying kinematic Hopf algebra.

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- Event

Date:
18th of November, 2022  @  13:00 - 14:15
Venue:
46/5081 and on Teams

Event details

The LHC is probing physics in a qualitatively new regime, above the electroweak symmetry-breaking scale.
Particle-level, differential measurements made in fiducial regions of phase-space have a high degree of model-independence and
can therefore be used not only to quantify how well Standard Model predictions describe physics in this new arena, but also
to constrain, or potentially reveal, physics beyond the Standard Model. I will describe a method to do this, including the use of active
learning to efficiently scan model parameter space, and give some examples of its impact.
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- Event

Date:
2nd of December, 2022  @  13:00 - 14:15
Venue:
46/5081 and on Teams

Event details

​I will begin with a slow introduction  to the amplituhedron, carefully explaining how to extract N=4 SYM amplitudes from it in detail. Then I will point out a couple of subtleties with the procedure in the literature, in particular showing that the lop amplituhedron is not a positive geometry as previously defined. We will thus extend the definition of positive geometries and further propose a more general mathematical space "weighted positive geometry". We will also discuss implications for the "deepest cut" of the amplitude.

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