The Muon g-2 experiment at Fermilab has recently confirmed Brookhaven's earlier measurement of the muon anomalous magnetic moment aμ. This new result increases the discrepancy Δaμ with the Standard Model (SM) prediction and strengthens its "new physics" interpretation as well as the quest for its underlying origin. In this talk I will review the SM prediction of the muon g-2, focusing on some...
I will review the current status of data-driven R-ratio as well as lattice QCD determinations of the hadronic vacuum polarization. I will then discuss universality tests within the lattice QCD community and the consistency with data-driven results based on the R-ratio. The talk will also present expected progress in the coming years.
Recent high gradient accelerator technologies will be introduced. Most popular high gradient accelerator is the laser plasma wakefield accelerator and it reaches up to 100 GV/m level. However it is currently low repetition rate and difficult for the cascading acceleration. On the other hand, there are another accelerator technologies to realize the high repetition and the cascading...
A muon collider provides a unique path to a high-energy, high-luminosity lepton collider that combines precision measurements and discovery potential. The talk will introduce the scheme and highlight some key challenges. It will also introduce the new collaboration that plans to develop the concept.
In this work, we update the peak theory for the estimation of the primordial black hole (PBH) abundance,
particularly by implementing the critical behavior in the estimation of the PBH mass and employing the averaged compaction function for the PBH formation criterion to relax the profile dependence.
We apply our peak theory to a specific non-Gaussian feature called the exponential tail,...
The standard deviation of the initial values of the nondimensional Kerr parameter a∗ of primordial black holes (PBHs) formed in the radiation-dominated phase of the universe is estimated to the first order of perturbation for the narrow power spectrum. Evaluating the angular momentum at turn around based on linearly extrapolated transfer functions and peak theory, we obtain the expression....
Primordial Black Holes might comprise a significant fraction of dark matter in the Universe and can give rise to observable signatures at current and future gravitational wave experiments. First, we review the PBH model and discuss how accretion and clustering may affect the properties of PBH binaries. Second, we confront the PBH model with LIGO/Virgo data showing its upsides and shortcomings,...
Although black holes can be the remnants of dead stars, it is also possible that some are primordial. Such primordial black holes are the unique dark matter candidate which is not a new type of particle, and they could also explain some of the unexpected properties of the black hole mergers that LIGO and Virgo have detected. I will summarise the evidence and (fine-tuning) challenges behind...
