Wayne Hu
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View article: Machine Learning Assisted Parameter-Space Searches for Lensed Gravitational Waves
Machine Learning Assisted Parameter-Space Searches for Lensed Gravitational Waves Open
When a gravitational wave encounters a massive object along the line of sight, repeated copies of the original signal may be produced due to gravitational lensing. In this paper, we develop a series of new machine-learning based statistica…
View article: Interference with gravitational instability: Hot and fuzzy dark matter
Interference with gravitational instability: Hot and fuzzy dark matter Open
Wave or fuzzy dark matter produced with high momenta behaves in many ways like hot particle dark matter while also possessing seemingly different phenomenology due to wave interference. We develop wave perturbation theory to show that whit…
View article: Universal lower bound on the axion decay constant from free streaming effects
Universal lower bound on the axion decay constant from free streaming effects Open
We show that enhancement of the axion relic abundance compared to the standard misalignment contribution generically leads to the production of nonzero momentum axion modes, resulting in warm dark matter behavior and enhanced isocurvature …
View article: Turning a negative neutrino mass into a positive optical depth
Turning a negative neutrino mass into a positive optical depth Open
Under $Λ$CDM, recent baryon acoustic oscillation (BAO) distance measures from DESI, which favor a low matter density $Ω_m$, are in moderate $2-3σ$ tension with cosmic microwave background (CMB) observations. This tension appears alternatel…
View article: Wave Interference in Self-Interacting Fuzzy Dark Matter
Wave Interference in Self-Interacting Fuzzy Dark Matter Open
In the Fuzzy Dark Matter (FDM) scenario, the dark matter is composed of an ultra-light scalar field with coherence length and wave interference on astrophysical scales. Scalar fields generically have quartic self-interactions that modify t…
View article: Warm and fuzzy dark matter: Free streaming of wave dark matter
Warm and fuzzy dark matter: Free streaming of wave dark matter Open
Wave or fuzzy dark matter that is produced with relativistic wave numbers exhibits free-streaming effects analogous to warm or hot particle dark matter with relativistic momenta. Axions produced after inflation provide such a warm or mildl…
View article: Testing gravity with realistic gravitational waveforms in Pulsar Timing Arrays
Testing gravity with realistic gravitational waveforms in Pulsar Timing Arrays Open
We consider the effects of relaxing the assumption that gravitational waves composing the stochastic gravitational wave background (SGWB) are uncorrelated between frequencies in analyses of the data from Pulsar Timing Arrays (PTAs). While …
View article: Testing Gravity with Realistic Gravitational Waveforms in Pulsar Timing Arrays
Testing Gravity with Realistic Gravitational Waveforms in Pulsar Timing Arrays Open
We consider the effects of relaxing the assumption that gravitational waves composing the stochastic gravitational wave background (SGWB) are uncorrelated between frequencies in analyses of the data from Pulsar Timing Arrays (PTAs). While …
View article: Dark matter isocurvature from curvature
Dark matter isocurvature from curvature Open
Isocurvature fluctuations, where the relative number density of particle species spatially varies, can be generated from initially adiabatic, or curvature, fluctuations if the various species fall out of or were never in thermal equilibriu…
View article: Measuring <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>μ</mml:mi></mml:math> distortions from the thermal Sunyaev-Zeldovich effect
Measuring distortions from the thermal Sunyaev-Zeldovich effect Open
The thermal Sunyaev-Zeldovich (tSZ) effect is a spectral distortion of the cosmic microwave background (CMB) resulting from inverse Compton scattering of CMB photons with electrons in the medium of galaxy clusters. The spectrum of the tSZ …
View article: Dark Matter Isocurvature from Curvature
Dark Matter Isocurvature from Curvature Open
Isocurvature fluctuations, where the relative number density of particle species spatially varies, can be generated from initially adiabatic, or curvature, fluctuations if the various species fall out of or were never in thermal equilibriu…
View article: Identifying strongly lensed gravitational waves through their phase consistency
Identifying strongly lensed gravitational waves through their phase consistency Open
Strongly lensed gravitational waves (GWs) from binary coalescence manifest as repeated chirps from the original merger. At the detectors, the phase of the lensed GWs and its arrival time differences will be consistent modulo a fixed consta…
View article: Synchronizing the consistency relation
Synchronizing the consistency relation Open
We study the N -point function of the density contrast to quadratic order in the squeezed limit during the matter-dominated (MD) and radiation-dominated (RD) eras in synchronous gauge. Since synchronous gauge follows the free-fall frame of…
View article: Dark matter trigger for early dark energy coincidence
Dark matter trigger for early dark energy coincidence Open
Current cosmological measurements present a persistent tension in the value of the current cosmic expansion rate, the Hubble constant, as inferred from cosmic microwave background (CMB) and large-scale structure (LSS) data compared to that…
View article: Measuring $μ$-Distortions from the Thermal Sunyaev-Zeldovich effect
Measuring $μ$-Distortions from the Thermal Sunyaev-Zeldovich effect Open
The thermal Sunyaev-Zel'dovich (tSZ) effect is a spectral distortion of the cosmic microwave background (CMB) resulting from inverse Compton scattering of CMB photons with electrons in the medium of galaxy clusters. The spectrum of the tSZ…
View article: Role of the Hubble scale in the weak lensing versus CMB tension
Role of the Hubble scale in the weak lensing versus CMB tension Open
Here, we explore a reparametrization of the lensing amplitude tension between weak lensing (WL) and cosmic microwave background (CMB) data and its implications for a joint resolution with the Hubble tension. Specifically, we focus on the l…
View article: Synchronizing the Consistency Relation
Synchronizing the Consistency Relation Open
We study the $N$-point function of the density contrast to quadratic order in the squeezed limit during the matter-dominated (MD) and radiation-dominated (RD) eras in synchronous gauge. Since synchronous gauge follows the free-fall frame o…
View article: A Dark Matter Trigger for Early Dark Energy Coincidence
A Dark Matter Trigger for Early Dark Energy Coincidence Open
Early dark energy (EDE), whose cosmological role is localized in time around the epoch of matter-radiation equality in order to resolve the Hubble tension, introduces a new coincidence problem: why should the EDE dynamics occur near equali…
View article: Role of the Hubble Scale in the Weak Lensing vs. CMB Tension
Role of the Hubble Scale in the Weak Lensing vs. CMB Tension Open
We explore a re-parameterization of the lensing amplitude tension between weak lensing (WL) and cosmic microwave background (CMB) data and its implications for a joint resolution with the Hubble tension. Specifically, we focus on the lensi…
View article: Early dark sector, the Hubble tension, and the swampland
Early dark sector, the Hubble tension, and the swampland Open
We consider the interplay of the Early Dark Energy (EDE) model, the Swampland Distance Conjecture (SDC), and cosmological parameter tensions. EDE is a proposed resolution of the Hubble tension relying upon a near-Planckian scalar field exc…
View article: Modified gravitational wave propagation with higher modes and its degeneracies with lensing
Modified gravitational wave propagation with higher modes and its degeneracies with lensing Open
Low-energy alternatives to General Relativity (GR) generically modify the phase of gravitational waves (GWs) during their propagation. As detector sensitivities increase, it becomes key to understand how these modifications affect the GW h…
View article: Accurate effective fluid approximation for ultralight axions
Accurate effective fluid approximation for ultralight axions Open
Ultralight axions are theoretically interesting and phenomenologically rich dark sector candidates, but they are difficult to track across cosmological timescales because of their fast oscillations. We resolve this problem by developing a …
View article: Spectral distortion anisotropy from inflation for primordial black holes
Spectral distortion anisotropy from inflation for primordial black holes Open
Single field inflationary models that seek to greatly enhance small scale\npower in order to form primordial black holes predict both a squeezed\nbispectrum that is enhanced by this small scale power and a potentially\ndetectable enhanceme…
View article: Amplification of primordial perturbations from the rise or fall of the inflaton
Amplification of primordial perturbations from the rise or fall of the inflaton Open
The next generation of cosmic microwave background, gravitational wave, and large scale structure, experiments will provide an unprecedented opportunity to probe the primordial power spectrum on small scales. An exciting possibility for wh…
View article: Primordial black holes arise when the inflaton falls
Primordial black holes arise when the inflaton falls Open
Primordial Black Holes (PBHs) have entered the forefront of theoretical cosmology, due their potential role in phenomena ranging from gravitational waves, to dark matter, to galaxy formation. While producing PBHs from inflationary fluctuat…
View article: The Early Dark Sector, the Hubble Tension, and the Swampland
The Early Dark Sector, the Hubble Tension, and the Swampland Open
We consider the interplay of the Early Dark Energy (EDE) model, the Swampland Distance Conjecture (SDC), and cosmological parameter tensions. EDE is a proposed resolution of the Hubble tension relying upon a near-Planckian scalar field exc…
View article: Spectral Distortion Anisotropy from Inflation for Primordial Black Holes
Spectral Distortion Anisotropy from Inflation for Primordial Black Holes Open
Single field inflationary models that seek to greatly enhance small scale power in order to form primordial black holes predict both a squeezed bispectrum that is enhanced by this small scale power and a potentially detectable enhancement …
View article: Gravitational wave propagation beyond general relativity: waveform distortions and echoes
Gravitational wave propagation beyond general relativity: waveform distortions and echoes Open
We study the cosmological propagation of gravitational waves (GWs) beyond general relativity (GR) across homogeneous and isotropic backgrounds. We consider scenarios in which GWs interact with an additional tensor field and use a parametri…
View article: Amplification of Primordial Perturbations from the Rise or Fall of the Inflaton
Amplification of Primordial Perturbations from the Rise or Fall of the Inflaton Open
The next generation of cosmic microwave background, gravitational wave, and large scale structure, experiments will provide an unprecedented opportunity to probe the primordial power spectrum on small scales. An exciting possibility for wh…