Event Category: Particle Seminar

Particle Seminar:
Wednesdays 2:00pm at LBNL

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Special Particle Theory Seminar | Julia Gehrlein (BNL) “Neutrino Windows to New Physics” Abstract: The observation of neutrino masses provides very strong evidence for physics beyond the Standard Model. In fact, neutrinos might be the first messengers of a new physics sector. In this talk I will discuss how the neutrino sector can provide insights into various new physics scenarios. … Read More

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Abstract: Dark matter in cosmic structures is expected to produce signals originated from its particle physics nature, among which the electromagnetic emission represents a relevant opportunity, whose intensity is directly linked to the amount of dark matter in galaxies and clusters. On the other hand, this emission is very faint, thus contributing only at the unresolved level. These unresolved radiation … Read More

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All anomaly-free U(1) theories  Abstract: In order to be well-behaved at high energies, gauge theories must be free of gauge anomalies. Furthermore, if the fermions are chiral the cancellation of anomalies requires careful assignment of the fermion charges under the gauge group.  For a U(1) theory the (integer) charges of the fermions must satisfy a cubic equation.  Generating consistent chiral theories is … Read More

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Dark Unification: a UV-complete Theory of Asymmetric Dark Matter Abstract: Motivated by the observed ratio of dark matter to baryon mass densities, which is around a factor 5, we propose a theory of dark-color unification. In this theory, the dark to visible baryon masses are fixed by the ratio of dark to visible confinement scales, which are determined to be nearby … Read More

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Particle Theory Seminar | Mike Trott (Niels Bohr Institute) “The Geometric SMEFT description of curved Higgs Field Space(s)”  The Geometric SMEFT description of curved Higgs Field Space(s) Abstract: In recent years, the effective field theory approach to the Standard Model, the SMEFT, has been used to study LHC data with ever increasing theoretical precision and sophistication. However, the complexity of this theory lead … Read More

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The string landscape, together with the mechanism of eternal inflation for populating vacua, leads to the seemingly inescapable conclusion that we are part of a vast multiverse. As an inhabitant of the multiverse, how should we reason probabilistically about the expected physical properties of our observable universe? Probabilities in eternal inflation are usually defined in terms of frequencies, but this … Read More

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Hongwan Liu (Princeton)  “A Stimulating Explanation of the Extragalactic Radio Excess” Abstract———–The extragalactic radio background in a frequency range of roughly 22 MHz — 90 GHz has been observed to be significantly brighter than standard astrophysical expectations of radio emission. It has also been shown to be unusually isotropic: they are unlikely to trace dark matter halos at z < … Read More

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Saniya Heeba (McGill U.)  “Freezing-In A Hot Bath” Abstract: In the absence of a clear dark matter signal, models beyond WIMPs have recently gained a lot of traction. One of the leading alternatives is the Feebly Interacting Massive Particle (FIMP) paradigm, where the dark matter abundance is set by the leakage of energy from the visible sector by the so-called freeze-in mechanism. … Read More

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-Cosmology may give rise to appreciable populations of both particle dark matter and primordial black holes (PBH) with the combined mass density providing the observationally inferred value of the dark matter abundance today. I will highlight that dark matter particles will generically form halos around the PBH and describe the form of these halos for different scenarios. I will then … Read More