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Prof. Anthony Williams (University of Adelaide)31/08/2026, 14:00Physics beyond the standard model
The strong CP problem arises from the apparent smallness of the QCD theta parameter, which is experimentally constrained to satisfy |theta| <~ 10^-10 despite being allowed by the local symmetries of the Standard Model. In this talk I revisit the conceptual assumptions underlying the theta-dependent formulation of QCD, with particular emphasis on the role of topology, global gauge structure,...
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Prof. Archil Kobakhidze31/08/2026, 14:25Physics beyond the standard model
I will describe a generic phenomenon that arises in systems supporting transitions between distinct topological states, together with the corresponding fermionic zero modes. In particular, I will argue for the formation of a condensate of composite fermion operators that spontaneously breaks an anomalous symmetry. The phase of the condensate gives rise to a collective, propagating particle...
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Elden Loomes (The University of Sydney)31/08/2026, 14:50Physics beyond the standard model
The thermodynamics of semiclassical black holes is described by the Wick rotated path integral in imaginary time—the partition function on the Euclidean Schwarzschild manifold. In this talk, I will argue that the non-trivial topology of this manifold leads to additional contributions to the partition function supporting $CP$ violation and a physical $\theta$-term even in the simplest case of...
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Aditya Singh Tejas (Australian National University)31/08/2026, 15:15Physics beyond the standard model
Quantum tunnelling of a particle through a potential barrier, while widely understood in quantum mechanics, has yet to receive a systematic treatment in quantum field theory (QFT) for particles coupled to an external field. Distinct QFT effects, such as the exchange of virtual particles and particle-antiparticle pair production and annihilation, can affect the dynamics of tunnelling in...
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Prof. Kazunari Shima31/08/2026, 16:10Physics beyond the standard model
On (unstable) Riemann space-time whose tangent space possesses NLSUSY structure, i.e., specified by Majorana spinor coordinate ψαi (i=1…N) besides the ordinary Minkowski coordinates xa , we find the unified vierbein waμ and obtain straightforwardly new Einstein-Hilbert(EH)-type action (Nonlinear-supersymmetric general relativity(NLSGR)) LNLSGR (waμ) equipping the cosmological term and the...
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Christian Canete (University of Sydney)31/08/2026, 16:35Physics beyond the standard model
Massive Abelian p-form gauge theories possess dualities that hold classically, but may be broken at the quantum level in non-trivial topological spacetimes. We demonstrate this in the BF model for massive gauge theories in d dimensions, where a p-form and a (d-p-1)-form are topologically coupled together in a gauge invariant way. Integrating out the (d-p-1)-form from its equation of motion...
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Joshua Cesca31/08/2026, 17:00Physics beyond the standard model
We study the cosmological implications of the minimal non-linear realisation of scale invariance within the Standard Model (SM). This framework provides a technically natural explanation for the hierarchy between the Planck scale and the electroweak scale and introduces only a light, feebly coupled dilaton field beyond the SM particles. Although the model is almost indistinguishable from the...
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Dr Mariko KIKUCHI (Saga University)01/09/2026, 16:10Physics beyond the standard model
Extended Higgs sectors with scalar triplet fields are well motivated by scenarios for neutrino mass generation, and are characterized by the electroweak rho parameter deviating from unity already at tree level. Such models can lead to characteristic deviations in Higgs boson observables.
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In this talk, we discuss precision predictions for decays of the 125 GeV Higgs boson in Higgs triplet... -
Dibyendu Chakraborty (Shiv Nadar IoE Deemed to be University)01/09/2026, 16:35Physics beyond the standard model
We study a five-dimensional (5D) framework based on the $U(1)_{L_\mu-L_\tau}$ gauge symmetry, where the associated gauge field $V$ propagates in the bulk, giving rise to an infinite tower of Kaluza--Klein (KK) excitations $V^{(n)}$ that couple selectively to the second- and third-generation leptons. Originally motivated by its potential to address the muon $g-2$ anomaly, this framework remains...
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Zhonglv Huang (TDLI)01/09/2026, 17:00Physics beyond the standard model
Among the charged leptons, the $\tau$ electric dipole moment~($d_\tau$) is the least constrained. We show that the Im[$d_\tau$] imposes strong constraints on new physics that have yet to be discussed. Motivated in particular by the Super Tau-Charm Facility (STCF), which will provide a uniquely clean environment for precision $\tau$-physics, we study the momentum-transfer dependence of...
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Marko Beocanin (University of New South Wales)03/09/2026, 14:00Physics beyond the standard model
Many phenomenological calculations involving massless or unstable particles suffer from divergences as mediating particles go on-shell. One way to deal with these divergences is via the Kinoshita-Lee-Nauenberg (KLN) theorem, which guarantees that by summing over all physically-degenerate processes, the divergences cancel and inclusive observables remain finite. However, actually implementing...
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Lachlan Tobin (UNSW)03/09/2026, 14:25Dark matter
Axion-like particles (ALPs) with flavour violating couplings could be produced via freeze-in from the decays and scatterings of heavy quarks in the hot early universe. In the right region of parameter space ($f_a\gtrsim 10^{9}$ GeV and $m_a\gtrsim 0.1$ MeV) this population of axions would be weakly interacting and stable for the lifetime of the universe; an interesting dark matter candidate....
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Garry Vong (UNSW)03/09/2026, 14:50Physics beyond the standard model
Atomic parity nonconservation (PNC) provides a sensitive low-energy probe of electroweak interactions and a pathway to test physics beyond the Standard Model (SM). PNC amplitudes arise from neutral currents mediated by the SM Z-boson and may receive additional contributions from hypothetical gauge bosons such as a Z′-boson.
For a low-mass Z′-boson, its contribution does not scale as...
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Haruto Kitagawa (UTokyo)03/09/2026, 15:15Physics beyond the standard model
We study Majoron dark matter (DM) in its minimal realization, based on the Type-I seesaw framework extended by a SM-singlet complex scalar. Remaining agnostic about the origin and value of the Majoron mass we evaluate the DM abundance from both the freeze-in and misalignment mechanisms, and identify the viable parameter space consistent with observational constraints. Without fine-tuning of...
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Radoslav Marchevski (École Polytechnique Fédérale de Lausanne (EPFL))03/09/2026, 16:10Physics beyond the standard model
The $K^{+}\rightarrow\pi^{+}\nu\bar{\nu}$ decay is a golden mode for flavour physics. Using data collected in 2016--2022, the NA62 experiment announced the first observation of this decay with a signal significance above $5\sigma$ and the measurement $\mathcal{B}(K^{+}\rightarrow\pi^{+}\nu\bar{\nu}) = \left( 13.0^{+ 3.3}_{- 3.0} \right)\times10^{-11}$. New results from the analysis of the...
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Ms Lipika Kolay (IIT Gandhinagar)03/09/2026, 16:35Physics beyond the standard model
Experimental studies of the semileptonic decays $B\to D^{(*)}\ell\bar{\nu}$ generally assume that the missing energy is carried by a massless neutrino, as predicted by the Standard Model (SM). This assumption may not hold if the invisible final-state particle is instead a massive fermion, such as a sterile neutrino or a dark-sector state. We investigate the effects of such a massive invisible...
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Weihang Zhang03/09/2026, 17:00Physics beyond the standard model
Baryon number violating (BNV) nucleon decays can serve as an interesting probe to physics beyond the Standard Model, especially in upcoming experiments with increased sensitivity. We investigate such decays using effective field theories and present relevant BNV operators at leading order in low energy effective field theory frameworks. We then derive current experimental constraints on...
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