Event Category: 4D Seminar

4D Seminar series:
Monday at 2:30 on campus

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We study the discovery potential of Z branching ratios due to contributions induced by the MSSM electroweak sector, assuming that the squarks and gluinos are heavy. Precision measurements at a future Z factory would yield sensitivity to MSSM that is complementary to direct searches at the LHC, provided that the systematic uncertainties can be reduced to a level comparable to … Read More

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Abstract: Measurements of the flavor structure of the Standard Model can be precise probes of physics beyond it. In this talk, we describe two implications of various flavor physics measurements. First, we discuss the use of Froggatt-Nielsen (FN) models for explaining the Standard Model flavor hierarchy. We define wrinkles, extra suppression or enhancement factors which modify the expected scaling of … Read More

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Abstract : Proto-neutron stars, formed in the center of Type-II supernovae, represent promising science targets for probing axions. The hypothetical particles are emitted via e.g. the Primakoff process and can modify the cooling rate of the proto-neutron stars and also convert to observable gamma rays while propagating through astrophysical magnetic field. Observations of Supernova 1987 (SN 1987A) from the Solar Maximum … Read More

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Abstract: Dark Matter (DM) remains mysterious. Despite decades of experimental and theoretical efforts, its microscopic identity is still unknown to us. In this talk, I will walk you through how a variety of celestial objects can be utilised as powerful DM detectors. This astrophysical probe, complementary to the terrestrial and cosmological probes, covers a significant portion of the DM parameters (DM … Read More

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Many attractive ideas on BSM physics involve strong gauge dynamics we do not understand well. I present recent attempts to gain better understanding of strong gauge dynamics using supersymmetry and anomaly mediation of supersymmetry breaking. Then I speculate on areas of BSM model building that they may open up.

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Abstract: I will review some of my work with Prof. Murayama over the past few years, applying Anomaly Mediated SUSY Breaking (AMSB) as a theoretical tool for understanding the dynamics of strongly coupled gauge theories. After reviewing the general properties of AMSB, I will show what we have been able to do when applying it to SUSY QCD, henceforth referred … Read More

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Vacuum fluctuations of the gravitational field lead to fluctuations in the measured length of an interferometer, such as LIGO. It has been suggested that due to some exotic quantum gravity effects, these fluctuations could be large enough to be observed. I will give two calculations using standard perturbative gravity viewed as an effective field theory, one purely geometrical and one … Read More

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This is a practice job talk,  so please provide notes. When bosonic Dark Matter (DM) has an ultra-light mass, it acts as a classical, coherent field. In many cases, and specifically for many models of axion-like-particles, this field has a magnetic-like effect on spins, and can therefore be measured by spin-based quantum magnetometers. In this seminar, I will explain the … Read More

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Abstract: We present a careful study of the chiral symmetry breaking minima and other potential minima in supersymmetric symplectic QCD (Sp(N) with F flavors) perturbed by Anomaly Mediated Supersymmetry Breaking (AMSB). Although the case of F = N+1 requires particular care due to the inherently strongly coupled nature of the quantum modified moduli space, we are able to show that … Read More