Results 51 to 60 of about 23,959 (174)
PhotonicsThe detection and characterization of exoplanets are central topics in astronomy, and high-contrast imaging techniques such nulling interferometry, coronagraphs, and extreme adaptive optics (ExAO) are key tools for the direct detection of exoplanets ...
Ziming Guo +5 more
doaj +1 more source
, 2008 We derive a generalised van Cittert-Zernike (vC-Z) theorem for radio astronomy that is valid for partially polarized sources over an arbitrarily wide field-of-view (FoV).
Carozzi, T. D., Woan, G.
core +2 more sources
Dual Optical Hyperbolicity of PdCoO2 and PdCrO2 Delafossite Single Crystals
Advanced Functional Materials, Volume 36, Issue 1, 2 January 2026.In this work, the hyperbolic response of PdCoO₂ and PdCrO₂ delafossites is investigated for the first time. They exhibit dual hyperbolic regimes, one localized around a phonon absorption in the mid‐infrared spectral region, and the other extending into the visible range.
Salvatore Macis +14 more
wiley +1 more source
Calibration Challenges for Future Radio Telescopes [PDF]
, 2010 Instruments for radio astronomical observations have come a long way. While the first telescopes were based on very large dishes and 2-antenna interferometers, current instruments consist of dozens of steerable dishes, whereas future instruments will be ...
Nijboer, Ronald +3 more
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Annalen der Physik, Volume 538, Issue 1, January 2026.The BRST invariant Lagrangian of the gravitationally interacting U(1)$U(1)$ gauge theory, namely the Quantum GraviElectro Dynamics (QGED). The Yan–Mills theory with the Hilbert–Einstein gravitational Lagrangian, namely the Yang–Mills–Utiyama (YMU) theory, is defined and quantised using the standard procedure. The theory is perturbatively renormalisable,
Yoshimasa Kurihara
wiley +1 more source
The unlikely rise of masking interferometry: leading the way with 19th century technology
, 2013 The exquisite precision delivered by interferometric techniques is rapidly being applied to more and more branches of optical astronomy. One particularly successful strategy to obtain structures at the scale of the diffraction limit is Aperture Masking ...
Tuthill, Peter G.
core +1 more source
Thermal noise from optical coatings in gravitational wave detectors [PDF]
, 2006 Gravitational waves are a prediction of Einstein's general theory of relativity. These waves are created by massive objects, like neutron stars or black holes, oscillating at speeds appreciable to the speed of light. The detectable effect on the Earth of
Abbott +17 more
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Accelerometer Data Transplant for Future Satellite Gravimetry
Earth and Space Science, Volume 13, Issue 1, January 2026.Abstract Accurate monitoring of the Earth's gravity field is crucial for understanding mass redistribution processes related to climate change, hydrology, and geodynamics. The Gravity Recovery and Climate Experiment (GRACE) and its successor, GRACE Follow‐On (GRACE‐FO), have provided invaluable satellite gravimetry data through low‐low satellite‐to ...
Mohsen Romeshkani +4 more
wiley +1 more source
European Physical Journal C: Particles and FieldsThe study of black hole shadows provides a powerful tool for testing the predictions of general relativity and exploring deviations from the standard Kerr metric in the strong gravitational field regime.
Temurbek Mirzaev +2 more
doaj +1 more source
Cryogenic Volume-Phase Holograpic Grisms for MOIRCS
, 2011 We have developed high dispersion VPH (volume phase holographic) grisms with zinc selenide (ZnSe) prisms for the cryogenic optical system of MOIRCS (Multi-Object near InfraRed Camera and Spectrograph) for Y-, J-, H- and K- band observations.
Ebizuka, Noboru +14 more
core +1 more source