| May 2025 |
| Monday | Tuesday | Wednesday | Thursday | Friday |
| 28 Marcus DuPont, Spherical Bondi accretion in a binary black hole system (12:30 PM - 1:30 PM) | 29 Risa Wechsler, Unveiling the nature of dark matter with small-scale cosmic structure (2:00 PM - 3:15 PM) + Abstract: Joan La Madrid, Comments on Gravity (4:00 PM - 5:30 PM) + Abstract: | 30 Calvin Chen, The Power of Precision Astrometry (10:00 AM - 11:30 AM) + Abstract: , HEP Journal Club (12:30 PM - 1:30 PM) Harikrishnan Ramani, Improving prospects for the direct detection of Higgsino dark matter (2:00 PM - 3:15 PM) + Abstract: | 1 Lyman Page, A New Experiment to Search for QCD Axions as Dark Matter (12:30 PM - 1:30 PM) + Abstract: Lyman Page, Exploring the Birth of the Universe with the CMB (4:00 PM - 5:30 PM) + Abstract: | 2 Calkins (3:30 PM - 4:30 PM) |
| 5 Wenzer Qin, A new way to form supermassive black holes (12:30 PM - 1:30 PM) | 6 Tetyana Pitik, Accretion-Induced Collapse of White Dwarfs: A Pathway to Gamma-Ray Bursts and Heavy Element Nucleosynthesis (2:00 PM - 3:15 PM) + Abstract: | 7 , HEP Journal Club (12:30 PM - 1:30 PM) Howie Haber, RG-stable parameter relations of a scalar field theory in absence of a symmetry (2:00 PM - 3:15 PM) + Abstract: | 8 | 9 Vladimir Rosenhaus, Renormalization Group in wave turbulence (11:10 AM - 12:30 PM) + Abstract: Calkins (3:30 PM - 4:30 PM) |
| 12 | 13 | 14 Sebastian Ellis, Classical and Quantum Detection of Gravitational Waves (11:00 AM - 12:15 PM) + Abstract: , HEP Journal Club (12:30 PM - 1:30 PM) Zach Weiner, Searching for coupled, hyperlight scalars across cosmic history (4:00 PM - 4:30 PM) + Abstract: | 15 | 16 Soichiro Shimamori, Boundary Scattering and Non-invertible Symmetries in 1+1 Dimensions (1:00 PM - 2:00 PM) + Abstract: |
| 19 | 20 | 21 Louis Hamaide, New insights into optomechanical detection of ultralight dark matter (2:00 PM - 3:00 PM) + Abstract: | 22 | 23 |
| 26 | 27 | 28 , Binary Accretion Discussion (11:00 AM - 12:30 PM) Sebastian Cespedes, Causality Bounds on the Primordial Power Spectrum (2:00 PM - 3:15 PM) -- Abstract: Effective field theories (EFTs) parametrize our ignorance of the underlying UV theory through their Wilson coefficients. However, not all values of these coefficients are consistent with fundamental physical principles. I will talk on a recent paper where we explore the consequences of imposing causal propagation on the comoving curvature perturbation in the EFT of inflation, particularly its impact on the primordial power spectrum and the effective sound speed $c_s^ ext{eff}$. We investigate scenarios where $c_s^ ext{eff}$ undergoes a transition, remaining consistent with CMB constraints at early times but later experiencing a drastic change, becoming highly subluminal. Such scenarios allow the primordial power spectrum to grow at small scales, potentially leading to the formation of primordial black holes or the generation of scalar-induced gravitational waves. We find the generic feature that in a causal theory, luminal sound speeds imply a free theory, effectively constraining the dynamics. Additionally, we obtain that when considering natural values for the Wilson coefficients, maintaining the validity of the EFT and the weakly coupled regime, and enforcing causal propagation of the EFT modes, the power spectrum cannot increase drastically. This imposes significant constraints on the parameter space of models aiming to produce such feature | 29 | 30 |