This seminar will give an introduction to and status update of the Hubble tension, the 6 sigma discrepancy between the two most precise methods for measuring the expansion rate of our Universe. The most promising resolutions of the tension employ … Read More

https://indico.ijs.si/event/2976/

I will review how one gets classical physics from quantum theories.  Then I will show that there are quantum states of the field theories of general relativity and electromagnetism that we typically ignore, but have interesting phenomenological effects.  These states … Read More

https://indico.ijs.si/event/3006/

We study classical background electric fields and the Schwinger effect in de Sitter space. We show that having a constant electric field in de Sitter requires the photon to have a tachyonic mass proportional to the Hubble scale. This has … Read More

Heavy non-annihilating dark matter captured by neutron stars can trigger collapse into low-mass black holes, producing subsolar-mass mergers detectable by gravitational wave observatories. These events probe dark matter-nucleon interactions at cross-sections below the neutrino floor and dark matter masses from … Read More

https://indico.ijs.si/event/3050/

TBA https://indico.ijs.si/event/3046/

Dark matter direct detection is dominated by a landscape of macroscopic detectors. How then can quantum sensors, such as an atom interferometer compete? In this talk I will outline recent work on how large coherent enhancements amplify dark matter signals … Read More

In the standard lore the decay of the false vacuum of a single-field potential is described by a semi-classical Euclidean bounce configuration that can be found using overshoot/undershoot algorithms, and whose action suppresses exponentially the decay rate. While this is generically correct, the … Read More