170 citations · 676 across the 24 of their papers we have counts for
24 papers
Impact of non-Gaussian likelihood on cosmological constraints from the thermal Sunyaev--Zel'dovich power spectrum: a simulation-based inference analysis
Licong Xu, Íñigo Zubeldia, James Alvey +2
The thermal Sunyaev--Zel'dovich (tSZ) power spectrum is a sensitive probe of cosmology and cluster astrophysics, but its statistics are non-Gaussian because the signal receives a s…
Detecting Gravitational-Wave Anisotropies with Simulation-Based Inference
Anna-Malin Lemke, Andrea Mitridate, Thomas Konstandin +2
Over the last five years, multiple Pulsar Timing Array (PTA) collaborations have reported mounting evidence for a gravitational-wave background (GWB) at nanohertz frequencies. Meas…
Dynamic SBI: Round-free Sequential Simulation-Based Inference with Adaptive Datasets
Huifang Lyu, James Alvey, Noemi Anau Montel +2
Simulation-based inference (SBI) is emerging as a new statistical paradigm for addressing complex scientific inference problems. By leveraging the representational power of deep ne…
Simulation-based inference with deep ensembles: Evaluating calibration uncertainty and detecting model misspecification
James Alvey, Carlo R. Contaldi, Mauro Pieroni
Simulation-Based Inference (SBI) offers a principled and flexible framework for conducting Bayesian inference in any situation where forward simulations are feasible. However, vali…
Sequential simulation-based inference for extreme mass ratio inspirals
Philippa S. Cole, James Alvey, Lorenzo Speri +4
Extreme mass-ratio inspirals pose a difficult challenge in terms of both search and parameter estimation for upcoming space-based gravitational-wave detectors such as LISA. Their s…
Tests for model misspecification in simulation-based inference: from local distortions to global model checks
Noemi Anau Montel, James Alvey, Christoph Weniger
Model misspecification analysis strategies, such as anomaly detection, model validation, and model comparison are a key component of scientific model development. Over the last few…
Leveraging Time-Dependent Instrumental Noise for LISA SGWB Analysis
James Alvey, Uddipta Bhardwaj, Valerie Domcke +2
Variations in the instrumental noise of the Laser Interferometer Space Antenna (LISA) over time are expected as a result of e.g. scheduled satellite operations or unscheduled glitc…
Dwarf galaxies imply dark matter is heavier than
Tim Zimmermann, James Alvey, David J. E. Marsh +2
It is widely established that a lower bound on the dark matter particle mass, , can be obtained by demanding that the de Broglie wavelength in a given galaxy must be smaller tha…
Simulation-based inference for stochastic gravitational wave background data analysis
James Alvey, Uddipta Bhardwaj, Valerie Domcke +2
The next generation of space- and ground-based facilities promise to reveal an entirely new picture of the gravitational wave sky: thousands of galactic and extragalactic binary si…
What to do when things get crowded? Scalable joint analysis of overlapping gravitational wave signals
James Alvey, Uddipta Bhardwaj, Samaya Nissanke +1
The gravitational wave sky is starting to become very crowded, with the fourth science run (O4) at LIGO expected to detect compact object coalescence signals. Da…
Scalable inference with Autoregressive Neural Ratio Estimation
Noemi Anau Montel, James Alvey, Christoph Weniger
In recent years, there has been a remarkable development of simulation-based inference (SBI) algorithms, and they have now been applied across a wide range of astrophysical and cos…
Peregrine: Sequential simulation-based inference for gravitational wave signals
Uddipta Bhardwaj, James Alvey, Benjamin Kurt Miller +2
The current and upcoming generations of gravitational wave experiments represent an exciting step forward in terms of detector sensitivity and performance. For example, key upgrade…
Albatross: A scalable simulation-based inference pipeline for analysing stellar streams in the Milky Way
James Alvey, Mathis Gerdes, Christoph Weniger
Stellar streams are potentially a very sensitive observational probe of galactic astrophysics, as well as the dark matter population in the Milky Way. On the other hand, performing…
No room to hide: implications of cosmic-ray upscattering for GeV-scale dark matter
James Alvey, Torsten Bringmann, Helena Kolesova
The irreducible upscattering of cold dark matter by cosmic rays opens up the intriguing possibility of detecting even light dark matter in conventional direct detection experiments…
Cosmic Neutrino Background Detection in Large-Neutrino-Mass Cosmologies
James Alvey, Miguel Escudero, Nashwan Sabti +1
The Cosmic Neutrino Background (CNB) is a definite prediction of the standard cosmological model and its direct discovery would represent a milestone in cosmology and neutrino phys…
What can CMB observations tell us about the neutrino distribution function?
James Alvey, Miguel Escudero, Nashwan Sabti
Cosmic Microwave Background (CMB) observations have been used extensively to constrain key properties of neutrinos, such as their mass. However, these inferences are typically depe…
Addendum: Refined bounds on MeV-scale thermal dark sectors from BBN and the CMB
Nashwan Sabti, James Alvey, Miguel Escudero +2
Very recently, the LUNA collaboration has reported a new measurement of the reaction rate, which plays an important role in the prediction of the primord…
Constraints on Global Symmetry Breaking in Quantum Gravity from Cosmic Birefringence Measurements
James Alvey, Miguel Escudero Abenza
All global symmetries are expected to be explicitly broken by quantum gravitational effects, and yet may play an important role in Particle Physics and Cosmology. As such, any evid…
New Constraints on the Mass of Fermionic Dark Matter from Dwarf Spheroidal Galaxies
James Alvey, Nashwan Sabti, Victoria Tiki +7
Dwarf spheroidal galaxies are excellent systems to probe the nature of fermionic dark matter due to their high observed dark matter phase-space density. In this work, we review, re…
The Axion Quality Problem: Global Symmetry Breaking and Wormholes
James Alvey, Miguel Escudero
Continuous global symmetries are expected to be broken by gravity, which can lead to important phenomenological consequences. A prime example is the threat that this poses to the v…
Refined Bounds on MeV-scale Thermal Dark Sectors from BBN and the CMB
Nashwan Sabti, James Alvey, Miguel Escudero +2
New light states thermally coupled to the Standard Model plasma alter the expansion history of the Universe and impact the synthesis of the primordial light elements. In this work,…
Improved BBN Constraints on the Variation of the Gravitational Constant
James Alvey, Nashwan Sabti, Miguel Escudero +1
Big Bang Nucleosynthesis (BBN) is very sensitive to the cosmological expansion rate. If the gravitational constant took a different value during the nucleosynthesis epoch than…
Light Dark Matter from Inelastic Cosmic Ray Collisions
James Alvey, Miguel Campos, Malcolm Fairbairn +1
Direct detection experiments relying on nuclear recoil signatures lose sensitivity to sub-GeV dark matter for typical galactic velocities. This sensitivity is recovered if there ex…
Linking Scalar Dark Matter and Neutrino Masses with IceCube 170922A
J. B. G. Alvey, M. Fairbairn
Two of the key unresolved issues facing Standard Model physics are (i) the appearance of a small but non-zero neutrino mass, and, (ii) the missing mass problem in the Universe. The…