T. L. May

Directed searches for gravitational waves from ultralight vector boson clouds around merger remnant and galactic black holes during the first part of the fourth LIGO-Virgo-KAGRA observing run

The LIGO Scientific Collaboration, the KAGRA Collaboration, K. Ackley, S Adhicary et autres

We present the first directed searches for long-transient and continuous gravitational waves from ultralight vector boson clouds around known black holes (BHs). We use LIGO data from the first part of the fourth LIGO-Virgo-KAGRA observing run. The searches target two distinct types …

fr (code pays fourni par la source)

High-accuracy topography measurement of optically rough surfaces with THz radiation

Bernhard Hils, Thomas Löffler, Mark D. Thomson, Wolff von Spiegel et autres

Characterization of the surface figure of technical materials by interferometry in the visible or near-IR wavelength regime becomes difficult or impossible if the surface is rough on the length scale of a tenth of the wavelength used. In this case, THz radiation …

de, nl (code pays fourni par la source)

On the way to an active terahertz camera: Optic design and its experimental verification

Christian am Weg, T. L. May, Bernhard Hils, Thomas Löffler et autres

We report on the simulation of a terahertz optics setup with the commercial, optic-design software package Zemax. We show that the analysis of both diffraction and abberation effects are well corroborated by the experimental results.

de (code pays fourni par la source)

Continuous-wave terahertz imaging with a hybrid system

Thomas Löffler, T. L. May, A. Alcin, Bernhard Hils et autres

A hybrid system for THz reflectometric imaging at 0.6 THz synchronizes a multiplied Gunn source with a femtosecond lasers for electro-optic detection and reaches 60 db dynamic range and 25 ms measurement time per pixel.

de (code pays fourni par la source)

Towards an active real-time THz camera: first realization of a hybrid system

T. L. May, Christian am Weg, A. Alcin, Bernhard Hils et autres

We report the realization of a hybrid system for stand-off THz reflectrometry measurements. The design combines the best of two worlds: the high radiation power of sub-THz micro-electronic emitters and the high sensitivity of coherent opto-electronic detection. Our system is based on …

de (code pays fourni par la source)

Continuous-wave terahertz imaging with a hybrid system

Torsten Löffler, T. L. May, Christian am Weg, A. Alcin et autres

The authors have developed a hybrid system for coherent raster-scan imaging at 0.6THz. It combines a high-power electronic source (a multiplied Gunn emitter) with a femtosecond Ti:sapphire laser in order to achieve a high dynamic range via electro-optic detection. The single-scan dynamic …

de (code pays fourni par la source)

Uniform model universes containing interacting blackbody radiation and matter with internal energy

T. L. May

Techniques previously developed for the production of general-relativistic models of the universe which contain interacting matter and blackbody radiation are extended to include models with internal energy and with nonzero cosmological constant. The material content of the model obeys a polytropic equation …

Uniform Model Universes Containing Interacting Blackbody Radiation and Matter with Internal Energy.

T. L. May

Uniform Model Universes Containing Matter and Black-Body Radiation

T. L. May, G. C. McVittie

Uniform Model Universes Containing Matter and Blackbody Radiation

T. L. May, G. C. Mevittie

Models which contain gaseous matter and ‘background ’ blackbody radiation are considered. A general method of solving Einstein's equations for such models is set up. It is applied to the elucidation and extension of previous work by McIntosh and to the discovery …

us (code pays fourni par la source)