Michael W. Toomey

Heterotic warm inflation

Arjun Berera, Heliudson Bernardo, Suddhasattwa Brahma, Jaime Calderón-Figueroa et autres

A bstract We propose a two-field model of warm inflation motivated by a heterotic string construction, involving an axion and a dilaton-like scalar field with non-trivial kinetic mixing. Gauge-field interactions generate dissipation and thermal corrections affecting both fields. A systematic numerical analysis …

gb, ca, in, br, us (code pays fourni par la source)

How theory-informed priors affect DESI evidence for evolving dark energy

Michael W. Toomey, Gabriele Montefalcone, Evan McDonough, Katherine Freese

us, ca, se (code pays fourni par la source)

Kinetic Mixing and the Phantom Illusion: Axion-Dilaton Quintessence in Light of DESI DR2

Michael W. Toomey, Ellie Hughes, Mikhail M. Ivanov, James M. Sullivan

Recent results from DESI BAO analyses suggest that dark energy may not be a cosmological constant and is in fact dynamical. Furthermore, the data suggest that the equation of state may have been in the phantom regime in the distant past, recently …

Learning theory informed priors for Bayesian inference: A case study with early dark energy

Michael W. Toomey, Mikhail M. Ivanov, Evan McDonough

Cosmological models are often motivated and formulated in the language of particle physics, using quantities such as the axion decay constant, but tested against data using ostensibly physical quantities, such as energy density ratios, assuming uniform priors on the latter. This approach …

us, ca (code pays fourni par la source)

FlowLensing: Simulating Gravitational Lensing with Flow Matching

Pranath Reddy, Michael W. Toomey, Sergei Gleyzer

Gravitational lensing is one of the most powerful probes of dark matter, yet creating high-fidelity lensed images at scale remains a bottleneck. Existing tools rely on ray-tracing or forward-modeling pipelines that, while precise, are prohibitively slow. We introduce FlowLensing, a Diffusion Transformer-based …

An LLM-driven framework for cosmological model-building and exploration

Nayantara Mudur, Carolina Cuesta-Lazaro, Michael W. Toomey, D. Finkbeiner

Experiment Results for An LLM-driven framework for cosmological model-building and exploration Subdirectories in quantities: model-specific_tests: Results of target-based evaluation (relative to the artifacts of the ground-truth repo) rewards: "Reward" metrics (Hubble tension / likelihood / BIC) Code available at: https://github.com/nmudur/Cosmo-LLM/

us (code pays fourni par la source)

An LLM-driven framework for cosmological model-building and exploration

Nayantara Mudur, Carolina Cuesta-Lazaro, Michael W. Toomey, D. Finkbeiner

Experiment Results for An LLM-driven framework for cosmological model-building and exploration Subdirectories in quantities: model-specific_tests: Results of target-based evaluation (relative to the artifacts of the ground-truth repo) rewards: "Reward" metrics (Hubble tension / likelihood / BIC) Code available at: https://github.com/nmudur/Cosmo-LLM/

us (code pays fourni par la source)

How Theory-Informed Priors Affect DESI Evidence for Evolving Dark Energy

Michael W. Toomey, Gabriele Montefalcone, Evan McDonough, Katherine Freese

Recent measurements of baryon acoustic oscillations (BAO) from the Dark Energy Spectroscopic Instrument (DESI) have been interpreted to suggest that dark energy may be evolving. In this work, we examine how prior choices affect such conclusions. Specifically, we study the biases introduced …

Domain Adaptation in Application to Gravitational Lens Finding

Hanna Parul, Sergei Gleyzer, Pranath Reddy, Michael W. Toomey

Abstract The next decade is expected to see a tenfold increase in the number of strong gravitational lenses, driven by new wide-field imaging surveys. To discover these rare objects, efficient automated detection methods need to be developed. In this work, we assess …

fr, us (code pays fourni par la source)

Kinetically Coupled Dark Matter Condensates

Michael W. Toomey, Savvas M. Koushiappas, Stephon Alexander

Dark matter consisting of ultralight bosons can form a macroscopic Bose-Einstein condensate with distinctive observational signatures. While this possibility has been extensively studied for axions and axion-like particles $-$ pseudoscalars with masses protected by shift symmetry $-$ realistic models from string theory …

Full-shape analysis with simulation-based priors: Cosmological parameters and the structure growth anomaly

Mikhail M. Ivanov, Andrej Obuljen, Carolina Cuesta-Lazaro, Michael W. Toomey

We explore full-shape analysis with simulation-based priors, which is the simplest approach to galaxy clustering data analysis that combines effective field theory (EFT) on large scales and numerical simulations on small scales. The core ingredient of our approach is the prior density …

us, ch (code pays fourni par la source)

Fundamental Physics with the Lyman-Alpha Forest: Constraints on the Growth of Structure and Neutrino Masses from SDSS with Effective Field Theory

Mikhail M. Ivanov, Michael W. Toomey, Naim Göksel Karaçaylı

We present an effective field theory (EFT) approach to extract fundamental cosmological parameters from the Lyman-alpha forest flux fluctuations as an alternative to the standard simulation-based techniques. As a first application, we reanalyze the publicly available one-dimensional Lyman-alpha flux power spectrum data …

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