Beyond The Standard Model
The Standard Model of particle physics is amazingly successful, yet it leaves many basic questions unanswered. From bizarre, unexplained parameters such as the cosmological constant, Higgs mass, or neutron electric dipole moment to the lack of explanation for observed phenomena such as dark matter and baryogenesis, there is strong evidence that the Standard Model must be extended. At SITP we have focused on finding solutions to these open problems to discover what these hints tell us about the underlying laws of physics.
Video Briefs
A Path to Detecting Self-Interacting Dark Matter using Astrophysical Sub-Structure
Dark matter self interactions can leave distinctive signatures on the properties of satellite…
PQ Axiverse
I construct a landscape of vacua of string theory and study the resulting ensemble of N-axion…
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Dr. Racco's research during his SITP postdoctoral appointment has been awarded the Third Prize of the 2023 Buchalter Cosmology Prize.
If the electron’s charge wasn’t perfectly round, it could reveal the existence of hidden particles. A new measurement approaches…
Peter Graham is interested in discovering the fundamental laws of nature that lie beyond the known standard model. He received an A.B./A…
Image credit: L.A. Cicero
Related Events
There is strong motivation to extend the observable frequency range of gravitational waves beyond the Hz - kHz regime already probed by LIGO and Virgo. In particular, exotic sources of higher-frequency gravitational waves can be searched for with…
Stars are efficient laboratories to probe feebly interacting particles (FIPs), such as axions. In this talk I will revise how different stages of low-mass and massive stars, concluding their lives with supernova explosions, can be used to…
A B-mode polarization signal in the cosmic microwave background is widely regarded as smoking gun evidence for gravitational waves produced during inflation. In this talk, I demonstrate that tensor perturbations from a cosmological phase…
I review some intriguing, and nuanced, dynamics in confining dark sectors. This is meant to underscore the elusive nature of such sectors across different experiments. I will study the effect of a first order confinement phase transition in…
Optically levitated microspheres are quantum-limited impulse sensors. In this talk, I will discuss their potential to discover MeV-scale, invisible states emitted in nuclear decays, including sterile neutrinos, axions, or other nucleon-coupled…
Stable dark matter (DM) particles may arise as dark pions from the confinement of dark quarks in a strongly interacting dark sector. Their relic abundance is determined not by annihilations into visible particles but by dark pion number-changing…
Ph.D. Candidate: Zach Bogorad
Research Advisor: Peter Graham
Date: May 13, 2024 Time: 10:00am PT
Location: Physics and Astrophysics Building (PAB) 214
Zoom Link: https://stanford.zoom.us/j/…
Compact supermassive dark-matter states act as gravitational lenses. Widely spatially separated space-based gamma-ray detectors would observe parallax of such an intervening lens with respect to cosmologically distant gamma-ray bursts (GRB). This…
In my talk, I will present recent work on the formation of primordial black hole dark matter and the resultant gravitational wave signal, drawing from recent results of https://arxiv.org/pdf/2303.02168.pdf, https://arxiv.org/pdf/…