A5033618048- Cosmology and Gravitation Theories
- Adaptive optics and wavefront sensing
- Dark Matter and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Black Holes and Theoretical Physics
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Military History and Strategy
- Law, Economics, and Judicial Systems
- Jury Decision Making Processes
- Pulsars and Gravitational Waves Research
- Scientific Research and Discoveries
- Computational Physics and Python Applications
- Advanced Measurement and Metrology Techniques
- Geophysics and Gravity Measurements
- Radio Astronomy Observations and Technology
- Statistical and numerical algorithms
- Quality and Management Systems
- Criminal Law and Evidence
- Optical Systems and Laser Technology
- Gambling Behavior and Treatments
University of Manchester
2024
University of Cambridge
2021-2022
SLAC National Accelerator Laboratory
2018
ABSTRACT We present angular power spectra and cosmological parameter constraints derived from the Planck PR4 (NPIPE) maps of cosmic microwave background. NPIPE, released by Collaboration in 2020, is a new processing pipeline for producing calibrated frequency data. have created versions CamSpec likelihood using these applied them to constrain lambda cold dark matter (ΛCDM) model single-parameter extensions. find excellent consistency between NPIPE 2018 at level, showing that cosmology robust...
Axionlike early dark energy (EDE) as an extension to $\mathrm{\ensuremath{\Lambda}}$ cold matter ($\mathrm{\ensuremath{\Lambda}}\mathrm{CDM}$) has been proposed a possible solution the ``Hubble tension.'' We revisit this model using new cosmic microwave background (CMB) temperature and polarization likelihood constructed from Planck NPIPE data release. In Bayesian analysis, we find that maximum fractional contribution of EDE total density is ${f}_{\mathrm{EDE}}<0.061$ (without SH0ES) over...
We present a transfer function-based method to estimate angular power spectra from filtered maps for cosmic microwave background (CMB) surveys. This is especially relevant experiments targeting the faint primordial gravitational wave signatures in CMB polarisation at large scales, such as Simons Observatory (SO) small aperture telescopes. While timestreams can be mitigate contamination low-frequency noise, usual methods that calculate mode coupling individual multipoles challenging covering...
Metacalibration is a state-of-the-art technique for measuring weak gravitational lensing shear from well-sampled galaxy images. We investigate the accuracy of measured with metacalibration fitting elliptical Gaussians to undersampled In this case, introduces aliasing effects leading an ensemble multiplicative bias about 0.01 Euclid, and even larger Roman Space Telescope, well exceeding missions' requirements. find that can be mitigated by computing shapes weighted moments wider as weight...
The Bench for Optical Testing (BOT) is a test stand that will be used metrology and optical testing of the Large Synoptic Survey Telescope (LSST) Camera CCD sensors, immediately after integration step where sensors are installed into Cryostat to form LSST's 3.2 gigapixel, 640mm diameter focal plane. BOT uses existing methods economically verify sensor performance, including measurement plane flatness, spacing, gain stability, cross-talk, flat field images, response in each filter band, dark...
The Integration and Verification Testing of the Large Synoptic Survey Telescope (LSST) Camera is described. LSST will be largest astronomical camera ever constructed, featuring a 3.2 giga-pixel focal plane mosaic 189 CCDs with in-vacuum controllers readout, dedicated guider wavefront CCDs, three element corrector 1.6-meter diameter initial optic, six optical filters covering wavelengths from 320 to 1000 nm novel filter exchange mechanism, camera-control data acquisition capable digitizing...
Motivated by observed discrepancies between ACT DR4 and Planck 2018 cosmic microwave background (CMB) anisotropy power spectra, particularly in the cross-correlation of temperature E-mode polarization, we investigate challenges that may be encountered comparison satellite ground-based CMB data. In particular, focus on effects Fourier-space filtering masking involving bright point sources. We show operation generates cross-shaped artifacts map, which stretch far outside typical point-source...
Axion-like early dark energy (EDE) as an extension to $\Lambda$CDM has been proposed a possible solution the 'Hubble tension'. We revisit this model using new cosmic microwave background (CMB) temperature and polarization likelihood constructed from {\it Planck} NPIPE data release. In Bayesian analysis, we find that maximum fractional contribution of EDE total density is $f_{\rm EDE} < 0.061$ (without SH0ES) over redshift range $z\in[10^3,10^4]$ Hubble constant constrained lie within $ 66.9...