INPA Seminar Speaker: Lorenzo Magrini (Stanford)-Title: A search for short-range new interactions with Mössbauer spectroscopy
2026-05-08 12:00 - 13:00 (America/Los_Angeles)
Date: May 8, 2026
Time: 12:00 pm – 1:00 pm
Location: Sessler Conference Room – 50A-5132 [Hybrid and In-Person]
Speaker: Lorenzo Magrini (Stanford)
Title: A search for short-range new interactions with Mössbauer spectroscopy
Abstract: New light particles, predicted by many proposed extensions of the Standard Model, would manifest as short-range forces between matter. At the nanoscale, electromagnetism is overwhelming, masking anything weaker. Nuclei, on the other hand, sit shielded inside their electron cloud — making them an exceptionally clean place to look. The recoilless 14.4 keV transition in ⁵⁷Fe gives access to this channel with a natural linewidth of ~5 × 10⁻⁹ eV!
I will present an ongoing experiment at Stanford that uses this resonance to probe new interactions between nuclei in the 20–400 nm range. A ⁵⁷Co source illuminates a thin ⁵⁷Fe absorber, while a gold source mass in close proximity would shift the resonance line through the new interaction. I will discuss the design, the systematics that set the ultimate reach, and what we hope to see.
Join Zoom Meeting
https://lbnl.zoom.us/j/95016696011?pwd=[REDACTED]
Meeting ID: 950 1669 6011
Passcode: [REDACTED]

NO INPA SEMINAR
2026-05-15 12:00 - 13:00

INPA Seminar Speaker: Jakob Robnik (UC Berkeley)-Title: Feasible MCMC in high-dimensional parameter spaces
2026-05-22 12:00 - 13:00
Date: May 22, 2026
Time: 12:00 pm – 1:00 pm
Location: Sessler Conference Room – 50A-5132 [Hybrid and In-Person]
Speaker: Jakob Robnik (UC Berkeley)
Title: Feasible MCMC in high-dimensional parameter spaces
Abstract: Statistical inference increasingly takes place in high-dimensional parameter spaces (thousands to billions of parameters) and is commonly the computational bottleneck of scientific workflows. To make this task scalable, we have developed Microcanonical Langevin Monte Carlo (MCLMC), the first out-of-the-box MCMC algorithm without Metropolis adjustment. Avoiding the adjustment yields superior scaling with the problem’s dimensionality, while still maintaining error guarantees. MCLMC outperforms current state-of-the-art samplers, such as the No-U-Turn Sampler (NUTS), across all the problems we considered. For example, for cosmological field-level inference from galaxy surveys with 2 million parameters, MCLMC inference takes 4 hours while NUTS needs more than 3 days for the same accuracy and computational resources. The gains continue to grow as the dimensionality increases. This kind of improvement can lead to scientific breakthroughs, for example, by enabling optimal information extraction or by enabling the study of solid-state systems of unprecedented size. In the talk, I will give intuition for how scalable MCMC must be in high dimensions, and then introduce MCLMC. I will show practical applications to benchmarks, lattice field theories, cosmological field-level inference, and Bayesian neural networks.
Join Zoom Meeting
https://lbnl.zoom.us/j/95016696011?pwd=[REDACTED]
Meeting ID: 950 1669 6011
Passcode: [REDACTED]

INPA Seminar Speaker: TBD
2026-05-29 12:00 - 13:00
Date: May 29, 2026
Time: 12:00 pm – 1:00 pm
Location: Sessler Conference Room – 50A-5132 [Hybrid and In-Person]
Speaker: TBD
Title: TBD
Abstract: TBD
Join Zoom Meeting
https://lbnl.zoom.us/j/95016696011?pwd=[REDACTED]
Meeting ID: 950 1669 6011
Passcode: [REDACTED]

INPA Seminar Speaker: TBD-Title: TBD
2026-06-05 12:00 - 13:00
Date: June 5, 2026
Time: 12:00 pm – 1:00 pm
Location: Sessler Conference Room – 50A-5132 [Hybrid and In-Person]
Speaker: TBD
Title: TBD
Abstract: TBD
Join Zoom Meeting
https://lbnl.zoom.us/j/95016696011?pwd=[REDACTED]
Meeting ID: 950 1669 6011
Passcode: [REDACTED]

INPA Seminar Speaker: TBD- Title: TBD
2026-06-12 12:00 - 13:00
Date: June 12, 2026
Time: 12:00 pm – 1:00 pm
Location: Sessler Conference Room – 50A-5132 [Hybrid and In-Person]
Speaker: TBD
Title: TBD
Abstract: TBD
Join Zoom Meeting
https://lbnl.zoom.us/j/95016696011?pwd=[REDACTED]
Meeting ID: 950 1669 6011
Passcode: [REDACTED]
