Abstract: In this talk I will present new constraints on U(1)LμâLÏ symmetry. In pulsar binaries, such U(1)LμâLÏ vectors induce an anomalously fast decay of the orbital period through the emission of dipole radiation. I’ll show the range of different pulsar binaries, finding the most powerful constraints for vector masses below O(10â18eV). For merging binaries the presence of muons in neutron … Read More
https://lbnl.zoom.us/j/215429094
Functional methods, in particular efficient reorganization of the one-loop effective action, have in recent years made a reappearance in simplifying the problem of computing matching and running effects in Lorentz-invariant EFTs such as the SMEFT. This has lead to the appearance of universal one-loop effective actions, where many such effects are now known in closed form for arbitrary field-content. Similar … Read More
Abstract: I will discuss a production scenario for QCD axion dark matter where the Peccei-Quinn phase transition occurs at a temperature far below the symmetry breaking scale. Both early cosmic string network dynamics and parametric resonance contribute to the axion population. The observed dark matter abundance is reproduced even if the decay constant is much lower than 10^11 GeV. I … Read More
Abstract: Soft Collinear Effective Theory (SCET) can be made compatible with supersymmetry, and such a theory can be conveniently formulated in “Collinear Superspace”. In this talk I will introduce a new set of effective field theory rules for constructing Lagrangians in collinear superspace. This new formalism represents a general way to derive on-shell superspace Lagrangians directly from the symmetries of … Read More
Abstract: We propose a novel explanation for the smallness of the observed cosmological constant (CC). Regions of space with a large CC are short lived and are dynamically driven to crunch soon after the end of inflation. Conversely, regions with a small CC are metastable and long lived and are the only ones to survive until late times. While the … Read More
Abstract: Millisecond pulsars are known to be very stable clocks, whose fluctuations in the periods of pulses observed over decades do not accumulate. We use the stability of these astrophysical clocks to derive prospects for detecting transiting dark matter substructure from frequency dependent fluctuations in the pulsar period over a 30 year timescale. We apply our results to deterministic and … Read More
Abstract: While the possible interactions of dark matter (DM) with nucleons, electrons, and photons has been extensively studied, we propose extending the search for dark matter by considering its interactions with muons. In particular, an ultralight DM background may apply an oscillating torque to muon spins, causing them to follow novel precession trajectories. A time-resolved analysis of muon precession data … Read More
Abstract: The precision of the data collected at the Large Hadron Collider (LHC) demands an increasing theoretical accuracy at the multi-differential level to fully exploit the LHC potential. In this talk I present the first joint resummation for a double-differential kinematic observable involving a jet algorithm in hadronic collisions. I show how a direct space formulation provides guidance to obtain … Read More