Events List

DateEvent TypeSpeaker
05/01/2025Special SeminarLyman Page [ + ]
05/01/2025Physics Dept ColloquiumLyman Page [ + ]
05/02/2025Hep-Th Discussion SessionCalkins [ + ]
05/05/2025CCPP Brown BagWenzer Qin [ + ]
05/06/2025Astro SeminarTetyana Pitik [ + ]
05/07/2025HEP Journal Club [ + ]
05/07/2025HEP SeminarHowie Haber [ + ]
05/09/2025Special SeminarVladimir Rosenhaus [ + ]
05/09/2025Hep-Th Discussion SessionCalkins [ + ]
05/14/2025Informal HEP TalkSebastian Ellis [ + ]
05/14/2025HEP Journal Club [ + ]
05/14/2025Informal HEP TalkZach Weiner [ -- ]

Title: Searching for coupled, hyperlight scalars across cosmic history
Abstract: New scalar fields may couple to the Standard Model by modulating its fundamental parameters in space and time. I will discuss a class of models in which a coupled scalar shifts the electron mass or the electromagnetic fine-structure constant before recombination, paying careful attention to the scalar's gravitational effects, the impact of Standard Model matter on its evolution, and its signatures relevant to complementary probes of fundamental constants at other epochs. I will show that a hyperlight, coupled scalar's gravitational effects open up new degeneracies in cosmological parameters and present quantitative constraints on theoretically consistent scenarios using cosmological data. In the process, I will expound the observational status of early-recombination models in relation to cosmological tensions and comment on the implications of these results for cosmological neutrino mass measurements. (4:00 PM - 4:30 PM, 726 Broadway, 940, CCPP Seminar)
05/16/2025Informal HEP TalkSoichiro Shimamori [ + ]
09/11/2025Physics Dept ColloquiumWendy Freeman [ + ]