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

Dark matter self interactions can leave distinctive signatures on the properties of satellite…

I construct a landscape of vacua of string theory and study the resulting ensemble of N-axion…

Related News

Dr. Racco's research during his SITP postdoctoral appointment has been awarded the Third Prize of the 2023 Buchalter Cosmology Prize.

Peter Graham

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

The history of particle accelerators is one of seemingly constant one-upmanship. Ever since the 1920s, the machines – which spur charged…

Credit: Harrison Truong

A team of Stanford University researchers are on a mission to identify dark matter once and for all. But first, they'll need to build the…

The hierarchy problem, the puzzlingly light mass of the Higgs, is one of the largest open questions in physics beyond the Standard Model…

Related Events

Pioneered in the 1950s by Hanbury Brown and Twiss, intensity interferometry refers to the correlation of light intensities incident on two telescopes. As its name suggests, it relies only on photon counting, allowing for interferometry with…

In this talk, I’ll discuss new ways of probing BSM physics using environmental effects - in particular the dense environments of stellar remnants . I‘ll present new bounds on lighter QCD axion models from white dwarves, and discuss how sourcing a…

The universal law of gravitation has undergone stringent tests for many decades over a significant range of length scales. However, on scales below a few tens of μm we are several orders of magnitude away from actually measuring gravitational…

Gao Head Shot

Abstract: Many puzzles of fundamental physics indicate the existence of new particles that interact feebly with ordinary matter, which makes them appear “dark” to us. Quantum sensors, given their low noise level, are promising devices to…

Gravitational waves with frequencies below 1 nHz are notoriously difficult to detect and fall below the typical cutoff frequency for conventional pulsar timing analyses. In this talk, I will present a new means of probing this regime through the…

With the direct detection of gravitational waves (GWs) from LIGO in 2016, and recent evidence from the NANOGrav collabortion for a stochastic GW background, GW astronomy is becoming an important tool for understanding the universe. Recently it…

Much remains to be understood about the origin and evolution of our universe's largest supermassive black holes (SMBHs). In this talk, I motivate the possibility that some fraction of these SMBHs may be primordial in origin,…

The 2021 Robert Hofstadter Memorial Lectures: Spin dynamics of ultracold atoms in optical lattices

Ultracold atoms offer a unique platform to study spin physics. When atoms are arranged in an optical lattice in form of a Mott insulator, the atomic motion is frozen out and the study and control of the spin degree of freedom emerges as a new…

The quantum chromodynamics axion is a well motivated new physics candidate that can explain the strong-CP problem related to the neutron electric dipole moment in addition to the dark matter (DM) in our Universe.  However, if the axion is…