COSMO-25

Abstract: The search for particle dark matter has seen tremendous progress and developments in the last decade. One of the primary methods for understanding the particle nature of dark matter is through direct detection. In this talk, I will provide an overview of the progress made in dark matter direct detection, discuss the synergies with other probes for dark matter, and give a look at what we can hope to see in the next decade.

ABSTRACT: New physics particles beyond the reach of terrestrial experiments are expected to play important roles in the early universe. In particular, they can leave unique signals in non-Gaussianity observables. I will give an overview of the connection between particle physics models and these so-called cosmological collider signals, and highlight some recent developments and future directions.

ABSTRACT: I will talk about cosmological results from the completed observations of the Atacama Cosmology Telescope, including polarized measurements of the cosmic microwave background that significantly extend the angular range probed by the Planck satellite. I will discuss implications for the LCDM model and the early universe. I will then talk about the status of new observations underway with the Simons Observatory in Chile, using a suite of telescopes to test the inflationary model, and to probe the physics of the later-time universe through correlations with overlapping large scale structure surveys.

ABSTRACT: In this talk I will overview the progression of Dark Energy Survey’s (DES) journey from the Science Verification to the final cosmological analysis with the full 6-year dataset. I will present some of the latest results from the Year 6 analysis. I will also describe how DES’s legacy will carry on into the next steps in our pursuit of understanding the nature of the Universe.

Abstract: I will introduce the Vera C. Rubin Observatory and its 10-year Legacy Survey of Space and Time (LSST), which is due to start by the end of this year. I will report on the construction, commissioning and operations of the Rubin system, describe the data that the LSST Dark Energy Science Collaboration will be using for cosmology, and give some indications of what we might hope to measure, and when.

Parallel 1a. Theme: Topology/COMPACT Chair: Asier Lopez-Eiguren (Euskal Herriko U) Room: Danforth

• Glenn Starkman (Case Western) — The Universe is not statistically isotropic
• Javier Carrón Duque (IFT-CSIC, Madrid) — Can the Topology of the Universe Affect the CMB?
• Amirhossein Samandar (Case Western) — Non-Trivial Topology: A Gateway to Probing Tensor Perturbations
• Deyan Mihaylov (Case Western) — Exploring cosmic topology with large-scale surveys
• Anna Negro (Case Western) — Signatures of cosmic topology in the early universe

Parallel 1b. Theme: LSS I: WL Chair: Claire Lamman (Ohio State U) Room: McKenna-Peter-Wright

• Alexandra Amon (Princeton) — Weak lensing cosmology: breaking astrophysical barriers
• Dhayaa Anbajagane (Chicago) — The DECADE cosmic shear project: Constraints on cosmology and astrophysics from 280 million galaxies across 13,000 deg2 of the sky
• Tianquing Zhang (Pitt) — Tomographic Weak Lensing and Galaxy Clustering with HSC Y3 and SDSS using the point-mass correction model
• Kokhi Tanida (Nagoya) — Testing General Relativity with weak lensing and galaxy clustering from HSC-Y3 and SDSS BOSS: Toward implementing MGCAMB into COCOA

Parallel 1c. Theme: Theory I Chair: Angelo Esposito (Sapienza U) Room: Connan

• Masaki Michiwaki (Rikkyo University) — Systematic Construction of Ghost-Free Scalar-Tensor Theories with Third-Order Derivatives
• Alexis Ortega (Brown) — Observable effects from Chern-Simons-Gauss-Bonnet Gravity
• Manuel Diaz (UMass Amherst) — Perturbative emergent modified gravity on cosmological backgrounds
• Lucas Fernandez Sarmiento (CMU) — Broken Weyl Gravity
• Santiago Agui Salcedo (KICP) — Open systems in cosmology

Parallel 1d. Theme: DM I Chair: Matteo Cremonesi (CMU) Room: McConomy

• Ivone Albuquerque (Sao Paulo) — Probing Light Dark Matter and Characterizing Low Energy Argon Recoils with the ReD Experiment
• Allan Sung (Princeton) — Current Status and Outlook for the DarkSide-20k Experiment
• Kairui Zhang (OU) — All axion dark matter from supersymmetric models
• Pankaj Munbodh (UCSC) — Spin-dependent scattering of sub-GeV dark matter
• Paola Arias (USS) — Dark photon dark matter production from axions

Parallel 2a. Theme: CMB/ML Chair: Hy Trac (CMU) Room: Danforth

• Lloyd Knox (UC Davis) — SPT-3G D1: CMB power spectra and cosmology using 2019 and 2020 observations of a 1500 square degree field
• Susanna Azzoni (Princeton U) — Simons Observatory SATs: Early Survey Data and the Road Ahead
• Hayley Nofi (JHU) — Recovering the Galactic Plane CMB Temperature Anisotropy at Large Angular Scales
• Laura Herold (JHU) — CMB Anomalies with Nearly Full-Sky Low-Multipole Temperature Maps
• Xiaowen Zhang (CMU) — Accelerating cosmological simulations with super resolution & Application of LLM in running simulations

Parallel 2b. Theme: LSS II Chair: Tianqing Zhang (U Pitt) Room: McKenna-Peter-Wright

• Kaili Cao (OSU) — Forecasts for weak lensing cosmology with Roman Space Telescope
• Rafael Gomes (UPenn) — Cosmological constraints from the three-point correlation function: an analysis of Dark Energy Survey Year 3 data
• Hayley Macpherson (UChicago) — Cosmological weak lensing in full general relativity
• Jeger Broxterman (Leiden) — Matter power spectrum reconstruction with KiDS-Legacy
• Wynne Turner (OSU) — Probing the limits of cosmological information from the Lyman-alpha forest 2-point correlation functions

Parallel 2c. Theme: Theory II Chair: Francesco Serra (Johns Hopkins) Room: Connan

• Wenqi Yu (HKUST): Interact or Twist — Cosmological Correlators from Field Redefinitions Revisited
• Petar Suman (Cambridge) — Hints of Cosmological Collider Signal in the CMB Data
• Julen Estonba (EHU) — Domain Wall Scaling: Comprehensive Analysis
• Wanil Park (Jeonbuk National U) — The minimal cosmological standard model
• Asier Lopez-Eiguren (EHU) — Evolution of black hole-string networks

Parallel 2d. Theme: DM II Chair: Valentina Dutta (CMU) Room: McConomy

• Angelo Esposito (Sapienza) — Antiferromagnets for light and ultra-light dark matter detection
• Zhijie (Jay) Xu (PNNL) — The WIMP miracle, Superheavy Dark Matter, and UHECRs
• Sai Chaitanya Tadepalli (IU) — Reviving sub-keV thermal warm dark matter
• Itamar Allali (Brown) — The QCD Axion and Its Large-scale Perturbations
• Jessica Nayely Lopez Sanchez (CEICO-FZU) — Phenomenology of the spin-s ULDM model

Abstract: I will overview a program of extracting cosmological information from clustering data using large-scale structure perturbation theory or effective field theory (EFT). The application of EFT allows for sub-percent precision analytic understanding of galaxy clustering on quasi-linear scales and provides an unmatched flexibility in testing new physics scenarios beyond the standard cosmological model. I will share some results of this program that include new measurements of fundamental cosmological parameters and novel constraints on dark energy, dark matter, and the physics of the early universe from public BOSS and DESI data. Finally, I will discuss the prospects of new discoveries in fundamental cosmology with EFT in the era of high-redshift surveys such as DESI-II and Spec-S5.

Abstract: Cosmological models and predictions rely extensively on the well-established field theory framework of particle physics. However, a qualitatively new challenge arises: cosmological systems inherently contain substances with poorly constrained macroscopic properties and entirely unknown microphysics, such as the inflaton sector, dark matter, and dark energy. This results in a rich array of novel phenomena, including dissipation, stochastic fluctuations, out-of-equilibrium dynamics, and non-unitary macroscopic evolution. Moreover, since gravitational observables are of primary interest, and gravity universally couples to all forms of matter, a close system approach requires precise description of all cosmic constituents—something feasible only in the simplest toy models. To address these challenges, I propose an open system approach to cosmology.

I begin with a pedagogical introduction to open quantum systems. Then, I present the open effective field theory of inflation as a general class of theories of single-field inflation in the presence of an unknown medium. This local, dissipative theory yields a new class of predictions for cosmological correlators, generalizing existing models. I then tackle the challenge of formulating general relativity in the presence of an unspecified medium. As a warmup, I present a formulation of electromagnetism in a medium, incorporating dissipation and fluctuations while ensuring a consistent treatment of gauge symmetries. Building on these results, I introduce the general and systematic construction of dissipative extensions of general relativity and explore their implications for modeling open dark matter, dark energy and the late-time evolution of the universe. Finally, I study the implications for the dissipative propagation of gravitational waves through the dark sector medium.

Abstract: I will review some recent developments in the study of quantum field theory in cosmological spacetimes. I will particularly focus on aspects of correlation functions and how they encode the physics of the early universe.

Abstract: The accuracy of the interpretation of the current generation of late-time cosmology probes is greatly limited by the theorists’ ability to predict the response of baryons. This will only get more difficult in the coming years with the upcoming surveys (DESI-BGS, Euclid, LSST, 4-most, Simons) mapping our sky with unprecedented precision. In this talk, I will discuss some of the efforts towards this challenge on the simulation side. I will, in particular, focus on the new generation of simulations, the FLAMINGO suite, designed to be virtual twins of the Stage IV cosmology surveys. This suite includes the largest simulation ever run to z=0 and exploits a state-of-the-art baryon physics model calibrated to the relevant data. Variations in the physics, trained via machine learning techniques, allow us to encompass the uncertainty in the modeling. Outputs in observer space, such as X-ray, stellar light and SZ lightcones are produced and are used to validate the simulations. I will present some of the main results obtained by exploiting the simulations. This talk is also an invitation to collaborate and make use of this data for your research.

Abstract: In this talk I will present how AI is changing cosmology. Machine learning algorithms can now classify millions of astronomical objects, reconstruct complex physical properties from photometric data, and identify cosmologically significant events in real-time. I will introduce recent applications of AI to cosmological analyses.

Using Type Ia supernova cosmology with the Dark Energy Survey (DES) as an example, I will show how machine learning enables the photometric classification of large samples of SN Ia that probe fainter magnitudes and higher redshifts than spectroscopically classified samples. These larger samples help reduce systematic uncertainties by including previously discarded supernovae in more diverse environments. However, applying AI in cosmology presents unique challenges: calibration, physical interpretability, and bias mitigation. I will present strategies for validating AI predictions and quantifying the impact of algorithmic choices on derived cosmological parameters.

I will conclude by discussing how AI methods will be essential for the Vera C. Rubin Observatory LSST, enabling unprecedented cosmological constraints and opening a new era for understanding Dark Energy.

Parallel 3a. Theme: Methods/sims/ML Chair: Laura Herold (JHU) Room: Danforth

• Alessio Spurio Mancini (Royal Holloway) — The future of cosmological inference
• Nanoom Lee (JHU) — Rapid and accurate numerical evolution of linear cosmological perturbations with non-cold relics
• Eishica Chand (Pune) — Utilizing kNN-CDFs to probe higher-order clustering of LSS tracers
• Nicholas Kern (UMich) — Differentiable Bayesian Models for Intensity Mapping: Unlocking Systematics-Robust Hydrogen Cosmology
• Camilla Theresia Grøn Sørensen (IFA) — Cosmic Curl: Features and Convergence of the Vorticity Power Spectrum in N-body Simulations

Parallel 3b. Theme: DESI Results Chair: Alexandra Amon (Princeton U) Room: McKenna-Peter-Wright

• Claire Lamann (OSU) — Detecting large-scale tidal field with upcoming surveys
• Andrei Cuceu (LBNL) — DESI Results: Lyman-alpha forest BAO and full-shape measurements and their cosmological interpretation
• Uendert Andrade (UMich) — Validation of the DESI DR2 BAO Measurements
• Segev BenZvi (Rochester) — Measuring Peculiar Velocities with the Dark Energy Spectroscopic Instrument

Parallel 3c. Theme: Theory III Chair: Savvas Koushiappas (Brown U) Room: Connan

• Perseas Christodoulidis (Ewha Womans University) — Open EFT for gauge fields and inflation
• Sebastian Cespedes (Imperial College) — On the UV completition of \lambda\phi^4 in de Sitter
• Mary Gerhardinger (UPenn) — A Numerical UV Completion for Simulating Scalar Galileons
• Greg Kaplanek (Syracuse) — Inflationary decoherence from the gravitational floor
• Giordano Cintia (AMU) — Modified Microcausality from Perturbation Theory

Parallel 3d. Theme: DM III Chair: Andrew Zentner (U Pitt) Room: McConomy

• Ngan Nguyen (Hopkins) — Indirect Searches for Ultraheavy Dark Matter in the Time Domain
• Erwin Tanin (Standford) — Making the Subdominant Dominant: Gravothermal Pile-Up of Collisional Dark Matter Around Compact Objects
• M. Sten Delos (Carnegie) — Prompt cusps of dark matter: a link to the cosmic initial conditions
• Taegyu Lee (Indiana) — Zn axion model on lattice

• Kushal Lodha (KASI) — Extended Dark Energy analysis using DESI DR2 BAO measurements
• David Shlivko (Princeton) — Beyond the cosmological constant: Detecting a dynamical dark energy
• Sk Sohail (JMI) — A Unified Early and Late Dark Energy Model and Its Effect on the Hubble Tension
• Joshua Kable (Rutgers) — Understanding Impact of Omega_m Constraints on Dark Energy at Either Early or Late Times
• Nathan Cruickshank (Portsmouth) — Interacting Dark Energy With Time-Dependent Momentum Exchange

Parallel 4b. Theme: LSS III: Clusters, Baryonic effects Chair: Sayan Mandal (CMU) Room: McKenna-Peter-Wright

• Chun-Hao To (UChicago) — Cosmological constraints from joint analyses of clusters, galaxies, and weak lensing
• Nihar Dalal (OSU) — Deciphering Baryonic Feedback with ACT tSZ Galaxy Clusters
• Nitya Ravi (Rochester) — The Extended Baryonic Tully-Fisher Relation of SDSS MaNGA Galaxies
• Maria Marinichenko (Leiden) — Probing the Impact of Baryons on Weak Lensing Convergence using the Scattering Transform

Parallel 4c. Theme: LSS IV /Theory IV Chair: Alice Garoffolo (U Penn) Room: Connan

• Aaron Ouellette (Illinois) — Cross-correlating SPT-3G CMB lensing and DES Y3 cosmic shear
• Rafael Bravo Guerraty (PUC) — Imprints of LSS in the Anisotropies of the CGWB
• Alexander Kayssi (McCaster) — One-point matter PDFs beyond TopHat filters
• Batia Friedman-Shaw (Perimeter) — Doppler bias: impact of peculiar velocities on color selection and the large scale structure of galaxy surveys
• Despoina Farakou (CEICO) — CMB lensing with EFTofLSS

Parallel 4d. Theme: DM IV Chair: Robert Scherrer (Vanderbilt U) Room: McConomy

• Swapnil Dutta (Pitt) — Cosmological Constraints on Majoron Dark Matter from Vanilla Leptogenesis
• Andrew Zentner (Pitt) — How to probe dark matter with stars
• Théo Paré (LUPM) — Probing Galactic dark matter objects from the heating of exoplanetary systems
• Marcell Howard (Pitt) — Gravitational Particle Production as a Mechanism for Generating Dark Matter
• Soumodeep Mitra (USD) — Extreme Mass Ratio Inspirals in rotating Dark Matter Spike

See poster for more details

Abstract: I will give an update of the Chicago Carnegie Hubble Program (CCHP) to measure the Hubble Constant with recent results from the Hubble and James Webb Space Telescopes. The CCHP has been developing methods for improving Cepheid and TRGB distances, and has developed a new method using carbon stars (the JAGB method).

Abstract: Taken at face value, the DESI evidence for a DE equation of state w < -1 may point to a richer dark sector. In this talk, I will review how dark matter-dark energy interactions can effectively mimic this behavior, while also alleviating the S_8 tension. I will present a well-motivated particle physics implementation of this idea, in which dark matter consists of dark baryons in a strongly-coupled hidden sector, and the dark energy field is the associated dark axion. The axion potential acquires finite-density corrections in the presence of dark baryons—precisely the interaction needed between dark matter and dark energy.

Abstract: Many dark energy (DE) models are based on a scalar field with timelike gradient while black holes (BHs) serve as probes of strong gravity. In this talk we begin with a review of the systematic construction of the effective field theory (EFT) describing perturbations around the Minkowski background with a timelike scalar profile and its extension to cosmological backgrounds, i.e. the ghost condensation and the EFT of inflation/DE. We then extend the EFT to arbitrary backgrounds. In this framework a set of consistency relations among EFT coefficients ensures the spatial diffeo invariance. Finally, we discuss applications of the general EFT to study perturbations of BH with a timelike scalar field responsible for DE.

Abstract: I will review the current status of cosmological inflation, discuss what upcoming experiments may reveal, and highlight some recent theoretical developments.

Abstract: Standard hot big bang predicts a thermal background of neutrinos, analogous to the CMB. This background has so far eluded detection in the laboratory. However, its properties can be inferred indirectly from cosmological observations of the large-scale structure of the universe. In this talk, I review some recent activities in the precision computation of this background, both in the standard and non-standard scenarios, as well as what we have learnt from observations.

• Valerio De Luca (Hopkins) — Gravitational memory and soft theorems: the local perspective
• Alexander Cassem (Tufts) — Unitarity, Causality, and Solar System Bounds may Significantly Limit the Use of Gravitational Waves to Test General Relativity
• Francescopaolo Lopez (SISSA) — Quantum signatures and decoherence during inflation from primordial gravitational waves
• Irvin Martinez-Rodriguez (CMU) — Neutron Stars as Perfect Fluids: Extracting the Linearized Response Function
• Antonio Enea Romano (UDEA/Icranet) — Are gravitational waves consistent with other probes of gravity and dark energy?

Parallel 5b. Theme: Tensions Chair: Antonella Palmese (CMU) Room: McKenna-Peter-Wright

• Praniti Singh (Brown) — Reionization and the Hubble Constant: Correlations in the Cosmic Microwave Background
• Gabriel Lynch (UC Davis) — Neutrino mass constraints in 2025: tensions between the CMB and BAO
• William Wolf (Oxford) — Assessing cosmological evidence for non-minimal coupling
• Tanvi Karwal (UChicago) — Cosmic tension phenomenology
• Prakhar Bansal (UMich) — Understanding late-time cosmology with DESI DR2

Parallel 5c. Theme: DM V / Early I Chair: Itamar Allali (Brown U) Room: Connan

• Subhajit Ghosh (UT Austin) — CMB constraints on non-minimally coupled ultralight dark matter
• David Imig (UIUC) — Constraining General Non-Thermal Light Massive Relics with the CMB
• Sofia Splawska (CMU) — Tailored mass estimators for milky way dwarf spheroidals
• Junqi Wang (U Pitt) — One-loop thermal radiation exchange in scalar power spectrum

Parallel 5d. Theme: Early II Chair: Anna Negro (Case Western) Room: McConomy

• Greg Lukens (Penn State) — Primordial non-Gaussianity with redshift space distortions in full-sky galaxy surveys
• Daniel Jiménez-Aguilar (Tufts) — On the probability of the initial conditions for inflation and slow contraction
• Loris Del Grosso (Hopkins) — Insights into the highest natural scale: challenging inflationary dynamics
• Ilia Musco (U Nova Gorica) — How to obtain slow roll inflation driven by non-linear electrodynamics

Parallel 6a. Theme: Neutrinos Chair: Segev BenZvi (U Rochester) Room: Danforth

• Diana Parno (CMU) — Probing the neutrino-mass scale with KATRIN
• Pranava Teja Surukuchi (Pitt) — Overview of the Project 8 Neutrino Mass Experiment
• Hexiang Huang (CMU) — Introduction to MARS Detector of COHERENT Experiment
• Hiroki Takahashi (U Tokyo) — Exploring chirality structure in nucleon decay

Parallel 6b. Theme: LSS V Chair: Andrei Cuceu (LBNL) Room: McKenna-Peter-Wright

• Sara Maleubre (Oxford) — The impact of galaxy bias on cross-correlation tomography
• Molly Wolfson (OSU) — Measuring the 1D Lyman-α forest power at z > 5
• Aritra Gon (Edinburgh) — Turning dispersion into signal: Density-split analyses of pairwise velocities
• Ananya Mukherjee (UML) — Impact of selection bias on local primordial non-Gaussianity constraints
• Naim Göksel Karaçaylı (OSU) — Small-scale cosmology with DESI Lyman-alpha forest

Parallel 6c. Theme: Theory V Chair: Dejan Stokovic (U Buffalo) Room: Connan

• Lokendra Singh Rathore (UMass Lowell) — Signatures of non-Markovian dissipation in open inflation
• Joshua Shterenberg (Princeton) — Numerical Relativity Tests of Plateau Inflationary Models
• Michiru Uwabo-Niibo (IBS CTPU-CGA) — Peaks sphericity of non-Gaussian random fields
• Daniel McLoughlin (Columbia) — Causality Constraints in de Sitter Spacetime
• Rocky Kolb (UChicago): Cosmological Production of Rarita-Schwinger fields

Parallel 6d. Theme: Early III Chair: Sebastian Cespedes (Imperial) Room: McConomy

• Sana Elgamal (UChicago) — Dynamical Solution to the Eta Problem in Spectator Field Models
• Keisuke Inomata (Hopkins) — Role of the counterterms in the conservation of superhorizon curvature perturbations at one loop
• Sayan Mandal (CMU) — Large-Scale Correlated Magnetic Fields from Primordial Seeds
• Kaito Yura (Nagoya U) — Imprints of helical primordial magnetic fields on parity-violating trispectrum
• Murman Gurgenidze (CMU) — Primordial magnetic field from chiral plasma instability with sourcing

Visit the Venues & Travel page for more details about the banquet.

Abstract: We will discuss the possibility that dark matter is composed of particles lighter than about 10 eV, in which case, the dark matter galaxy halo is best thought of as a set of waves. The astrophysical consequences, and the experimental implications for axion detection, will be discussed.

Abstract: The precise measurement of the Hubble constant has revealed a challenging discrepancy between early- and late-universe observations, known as the Hubble tension. At the same time, surveys of supernovae and baryon acoustic oscillations point to possible deviations from a simple cosmological constant as the driver of cosmic acceleration. Together, these findings challenge the standard ΛCDM model and raise the possibility of new physics beyond our current framework. In this talk, I will review the latest measurements, highlight the differences between these two tensions, and discuss how upcoming data from Rubin Observatory and Roman Space Telescope will help with our understanding of the universe’s expansion.

Abstract: I will review the status of current proposed solutions to the “Hubble tension”, assess their limitations, and outline general principles for constructing viable models.

Abstract: The LIGO-Virgo-KAGRA Collaborations have recently published the latest set of gravitational wave observations from collisions of black holes and neutron stars. This cumulative catalog (GWTC-4) comprises over 200 individual signals, over half of them detected during the latest observing run. Collectively, these signals encode invaluable information about the physics and astrophysics of compact objects and the massive stars that produced them, and their redshift distribution can trace cosmic expansion independently of traditional standard candles. Additionally, the remarkably clear signal GW250114 has now given us the most exquisite view of a perturbed black hole yet, with multiple discernible quasi normal modes in the data. In this talk, I will summarize some of these exciting results and outline their implications.

Abstract: Pulsar timing arrays are sensitive to nanohertz-frequency gravitational waves from supermassive black hole binaries. Building on recent evidence for a gravitational-wave background, we conducted targeted searches in the NANOGrav 15-year dataset for signals from 114 active galactic nuclei identified as candidate binaries through electromagnetic observations. While no significant detections are made, two sources emerge as especially compelling for future monitoring. I will present our methods, upper limits, and the implications of these results for binary populations and prospects for discovery with expanding PTA datasets.

Parallel 7a. Theme: GW/MMA I: results/methods Chair: Antonella Palmese (CMU) Room: Danforth

• Bryce Cousins (UIUC) — The Stochastic Siren: Astrophysical Gravitational-Wave Background Measurements of the Hubble Constant
• Ignacio Magana Hernandez (CMU) – Gravitational-wave dark siren cosmology with DESI
• Niccolò Passaleva (Sapienza U) — PRIME Telescope Follow-Up of Binary Black Hole Mergers for Cosmological Applications
• Jiaming Pan (UMich) — Determining the Hubble Constant through Cross-Correlation of Galaxies and Gravitational Waves
• Ariel Amsellem (CMU) — Peculiar Velocity Improvements of Standard Siren Measurements

Parallel 7b. Theme: Early IV / GW II Chair: Ilia Musco (U Nova Gorica) Room: McKenna-Peter-Wright

• Takahiro Terada (KMI, Nagoya U) — Quintessence with a transitional feature and gravitational-wave signals
• Sofia Panagiota Corbà (UMass Amherst) — Gravitational wave anisotropies from axion inflation
• Fazlollah Hajkarim (U Oklahoma) — Primordial Gravitational Waves from Phase Transitions During Reheating
• Nicklas Ramberg (SISSA) — Bubble Nucleation In Strongly Coupled QFTs

Parallel 7c. Theme: BH I Chair: Valerio De Luca (JHU) Room: Connan

• Naritaka Oshita (Kyoto U) — Universal chords of black hole ringdown
• Katsuki Aoki (YITP) — On-shell approach to black hole mergers
• Hajime Kobayashi (YITP) — Parametrized Tidal Dissipation Numbers of Non-rotating Black Holes
• Akira Taniguchi (Kyushu U) — Parity violation in photon quasinormal modes of black holes
• Brandon Khek (UPenn) — Patterns in the Tidal Love Numbers of Analog Black Holes

Parallel 8a. Theme: GW/MMA II: theory Chair: Ignacio Magaña Hernandez (CMU) Room: Danforth

• Alice Garoffolo (UPenn) — Gravitational waves in the wave optics regime
• Sarunas Verner (UChicago) — Gravitational Wave Signals from Spectator Scalar Fields
• Xinpeng Wang (IPMU) — Gravitational Waves from Yukawa-Bound Halo Mergers
• Sebastian Zell (LMU) — Multi-Messenger Signals from Memory Burden: Detectable Small Primordial Black Holes as Dark Matter
• Chris Choi (CMU) — Detecting Additional Polarization from Massive Gravitons in Pulsar Timing Datasets

Parallel 8b. Theme: Theory VI Chair: Nishant Agarwal (U Mass Lowell) Room: McKenna-Peter-Wright

• Dejan Stojkovic (SUNY Buffalo) — Beyond Quantum Mechanics
• Zongzhe Du (University of Nottingham) — Finding new Exceptional theories in de Sitter space
• Nidhi Sudhir (UW Madison) — Topological aspects of particle production
• Amartya Sengupta (SUNY Buffalo) — The Signals of the Doomsday
• Francesco Serra (Johns Hopkins U) — New phases of gauge theory and their cosmological inprint

Parallel 8c. Theme: BH II Chair: Naritaka Oshita (Kyoto U) Room: Connan

• Bruno Bucciotti (ASU) — Progress on Black Hole Quadratic Quasi-Normal Modes
• Mudit Rai (Texas A&M) — Aspects of PBH formation
• Gabriele Franciolini (CERN) — Searching for subsolar mass primordial black holes with gravitational waves
• Mesut Caliskan (Hopkins) — A Fog Over the Cosmological SGWB: Unresolved Massive Black Hole Binaries in the LISA Band
• Kitaro Taniguchi (Tokyo University of Science) — Linear perturbations of dyonic black holes in the lowest-order U(1) gauge-invariant scalar-vector-tensor theories

Parallel 8d. Theme: LSS VI: SZ Chair: Chun-Hao To (U Chicago) Room: McConomy

• Jordan Krywonos (Perimeter) — First constraints on the remote quadrupole field from the polarized Sunyaev Zel’dovich effect
• Avery Tishue (UIUC) — Probing Fundamental Physics with kSZ Tomography
• Michael Rashkovetskyi (OSU) — Clustering of DESI galaxies split by thermal Sunyaev-Zeldovich effect
• Yurii Kvasiuk (Wisconsin Madison) — Velocity reconstruction via kSZ effect from ACT-DR6 and DESI-LS
• Mikel Charles F (OSU) — Quasar clustering at high-z with DESI DR2

Abstract: Large-scale spectroscopic surveys provide unique information that addresses many fundamental questions in physics, especially the nature of cosmic acceleration or dark energy, dark matter, and primordial inflation. The Dark Energy Spectroscopic Instrument (DESI) collaboration is in the midst of an eight-year survey that will map over 60 million galaxies and quasars. This effort has already produced the largest three-dimensional map of the universe to date. Our results from the first three years of observations show indications that the impact of dark energy may be weakening with time. I will describe these measurements, including our many systematic checks and blinding methodology, and discuss the evidence for evolving dark energy when we combine our results with other surveys.

Abstract: The biggest surprise from JWST observations has been the discovery of little red dots. They are as common as ~5% of the total galaxy population beyond z>4 and yet are not found at later cosmic times. Theories have swirled regarding their physics from massive compact galaxies to supermassive black holes enshrouded in substantial dust, to black holes surrounded by stellar atmospheres. I will discuss the little red dot phenomenon and whether it (and/or other related JWST observed phenomena) pose interesting constraints on the physics of the cosmos.

Abstract: The nonlinear regime of structure formation provides unique opportunities to test predictions of the ΛCDM model, including the growth of structure and the nature of dark matter. Historically, observed properties of low-mass galaxies in the nearby Universe have been the source of many reported tensions with the standard cosmological model, but the JWST era has led to interest in possible discrepancies at the earliest epochs of galaxy formation as well. I will review theoretical expectations for these regimes and discuss the health of ΛCDM at early and late times on the nonlinear scales relevant for galaxies.

Abstract: The epoch of cosmological inflation was followed by a period of heating when the energy that had been driving the accelerated expansion was used to form the primordial plasma. The simplest scenario is that nonrelativistic inflaton particles decay to create a thermal bath of Standard Model particles. But the dynamics may have been more complex, leading to interesting implications for the origin of dark matter, the matter-antimatter asymmetry, cosmological magnetism, and primordial gravitational wave radiation. In this talk, I’ll review the physics of reheating and the observational signatures afforded by various cosmological relics.