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Jan 15, 2025 | 
academic.oup.com | Blackett Laboratory
Atmospheric escape is now considered the major contributing factor in shaping the demographic of detected exoplanets. However, inferences about the exoplanet populations strongly depend on the accuracy of the models. Direct observational tests of atmospheric models are still in their infancy. Helium escape from planetary atmospheres has rapidly become the primary observational probe, already observed in ≳20 exoplanets.
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Oct 14, 2024 | 
academic.oup.com | Blackett Laboratory |Keble Road |Departamento de Astrofísica
High-redshift protoclusters consisting of dusty starbursts are thought to play an important role in galaxy evolution. Their dusty nature makes them bright in the FIR/submm but difficult to find in optical/NIR surveys. Radio observations are an excellent way to study these dusty starbursts, as dust is transparent in the radio and there is a tight correlation between the FIR and radio emission of a galaxy.
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Sep 25, 2024 | 
academic.oup.com | Madingley Road |Blackett Laboratory
Vertical gas and dust flows in protoplanetary discs waft material above the midplane region in the presence of a protoplanet. This motion may alter the delivery of dust to the planet and its circumplanetary disc, as well as through a planetary-induced gap region and hence the inner disc chemistry. Here, we investigate the impact of a massive embedded planet on this material transport through the gap region.
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Sep 9, 2024 | 
link.springer.com | Hong Kong S.A.R |Blackett Laboratory
Recent advances in understanding the hot-electron dynamics in plasmonic nanostructures have significantly impacted a variety of plasmonically powered physical, chemical, and even biological processes.
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May 31, 2024 | 
pubs.aip.org | Hung Hom |Nanyang Technological |Blackett Laboratory
Quantum technologies offer potential advantages in a broad spectrum of applications such as quantum computing,1 quantum communication,2 and metrology.3 However, quantum systems are inherently fragile, such that environmental noise and imperfect control over the quantum system curtail the capabilities of quantum devices.
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Apr 8, 2024 | 
link.aps.org | Mariana Gonzalez |Mariana González |Blackett Laboratory
We find bounds on the Wilson coefficients of effective field theories (EFTs) living in a universe undergoing expansion by requiring that its modes do not propagate further than a minimally coupled photon by a resolvable amount. To do so, we compute the spatial shift suffered by the EFT modes at a fixed time slice within the WKB approximation and the regime of validity of the EFT. We analyze the bounds arising on shift-symmetric scalars and curved space generalizations of Galileons.
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Jan 19, 2024 | 
link.aps.org | Matthew Roberts |Toby Wiseman |Blackett Laboratory
We consider the nearest-neighbor lattice tight-binding model of graphene with slowly spatially varying hopping functions. We develop a systematic low-energy approximation as a derivative expansion in a Dirac spinor field that is perturbative in the strength of the hopping function deformation. The well-known leading description in both the derivative and perturbative expansions is the Dirac equation in flat 2+1-dimensional spacetime with magnetic (strain-)gauge field.
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Dec 21, 2023 | 
academic.oup.com | Blackett Laboratory
A measurement of the 21-cm global signal would be a revealing probe of the Dark Ages, the era of first star formation, and the Epoch of Reionization. It has remained elusive owing to bright galactic and extra-galactic foreground contaminants, coupled with instrumental noise, ionospheric effects, and beam chromaticity. The simultaneous detection of a consistent 21-cm dipole signal alongside the 21-cm global signal would provide confidence in a claimed detection.
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Dec 13, 2023 | 
academic.oup.com | Blackett Laboratory
Models derived in 2009 to fit mid-infrared (8-24 micron) source counts from the IRAS, ISO and Spitzer missions, provide an excellent fit to deep counts with JWST, demonstrating that the evolution of dusty star-forming galaxies is well understood. The evolution of dust in galaxies at high redshifts is discussed and a simple prescription is proposed to model this. This allows more realistic models for source-counts at submillimetre wavelength.
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Oct 25, 2023 | 
link.aps.org | Claudia de Rham |Blackett Laboratory |Andrew J. Tolley |Toby Wiseman
We present a formulation of ghost-free massive gravity with flat reference metric that exhibits the full nonlinear constraint algebraically, in a way that can be directly implemented for numerical simulations. Motivated by the presence of higher order operators in the low-energy effective description of massive gravity, we show how the inclusion of higher-order gradient (dissipative) terms leads to a well-posed formulation of its dynamics.
