Results 91 to 100 of about 292,957 (316)

On the Observation of Distant Objects in General Relativity and Its Implications in Cosmology

Universe
We carry out a careful analysis of the notion of observation of distant events in a curved Universe. This leads us to hypothesise that all measurements of our physical environment are performed with respect to a representation referential that obeys the ...
Théophile Caby
doaj   +1 more source

Puzzlement about thermal redshift

, 1997
Discussed is the classical theoretical description of the experimentally established thermal redshift of spectral lines. Straightforward calculation of the observable spectrum from a canonical ensamble of monochromatic radiators yileds overall blueshift ...
Blatter, Clark, Combourieu, Compton, Dehn, Indebetouw, Jackson, James, Jaynes, Josephson, Jüttner, Kandpal, Kidd, Pound, Shapiro, Shapiro, Singwi, Trooster, Van Hove, Van Vleck, Vesselin I. Dimitrov, Wolf   +21 more
core   +1 more source

The Inverse Redshift-Space Operator: Reconstructing Cosmological Density and Velocity Fields [PDF]

, 1999
We present the linear inverse redshift space operator which maps the galaxy density field derived from redshift surveys from redshift space to real space. Expressions are presented for observers in both the CMBR and Local Group rest frames.
Andy Taylor, Ballinger, Branchini, Croft, Fisher, Hamilton, Heavens, Heavens, Helen Valentine, Kaiser, Kaiser, Nusser, Peacock, Peebles, Peebles, Regös, Rowan-Robinson, Rowan-Robinson, Saunders, Schmoldt, Shaya, Strauss, Szalay, Tadros, Taylor, Taylor, Tegmark, Valentine, Watson, Webster, Yahil, Zaroubi, Zaroubi   +32 more
core   +2 more sources

High‐Redshift Supernova Rates

The Astrophysical Journal, 2004
We use a sample of 42 supernovae detected with the Advanced Camera for Surveys on-board the Hubble Space Telescope as part of the Great Observatories Origins Deep Survey to measure the rate of core collapse supernovae to z~0.7 and type Ia supernovae to z~1.6. This significantly increases the redshift range where supernova rates have been estimated from
Dahlen, T, Strolger, LG, Riess, AG, Mobasher, B, Chary, RR, Conselice, CJ, Ferguson, HC, Fruchter, AS, Giavalisco, M, Livio, M, Madau, P, Panagia, A, Tonry, JL   +12 more
openaire   +2 more sources

Quasi‐Static to Supersonic Energy Absorption of Nanoarchitected Tubulanes and Schwarzites

Advanced Functional Materials, EarlyView.
Nanoarchitected energy‐absorptive Tubulanes exhibit record energy absorption under quasi‐static conditions and exceptional inelastic energy dissipation under 750 m s−1 ballistics impact, with high performance spanning strain rates of 12 orders of magnitude.
Peter Serles, Alianna Maguire, Thomas Butruille, Jet Lem, Shuo Yang, Pedro Guerra Demingos, Sahar Choukir, Michel Haché, Boran Kumral, Katherine Jia, Charles Jia, Yu Zou, Chandra Veer Singh, Carlos M. Portela, Jun Lou, Pulickel M. Ajayan, Tobin Filleter   +16 more
wiley   +1 more source

Redshift and Photon Energy Attenuation Constant in Vacuum

Доклады Белорусского государственного университета информатики и радиоэлектроники
There obtained an estimate of the minimum value of the photon energy attenuation constant in vacuum α: α = 8 · 10–19 m–1 based on quantum concepts of the structure of vacuum and data on the red shift of the emitter spectra of distant galaxies. Presumably,
A. A. Kurayev, V. V. Matveyenka
doaj   +1 more source

On the Anticorrelation between Duration and Redshift in Gamma-Ray Bursts

The Astrophysical Journal, 2023
For gamma-ray bursts (GRBs) with durations greater than two seconds (so-called long GRBs), the intrinsic prompt gamma-ray emission appears, on average, to last longer for bursts at lower redshifts.
Nicole Lloyd-Ronning, Jarrett Johnson, Roseanne M. Cheng, Ken Luu, Phoebe Upton Sanderbeck, Lailani Kenoly, Celia Toral   +6 more
doaj   +1 more source

HUBBLE PARAMETER MEASUREMENT CONSTRAINTS ON THE REDSHIFT OF THE DECELERATION–ACCELERATION TRANSITION, DYNAMICAL DARK ENERGY, AND SPACE CURVATURE [PDF]

, 2016
We compile an updated list of 38 measurements of the Hubble parameter H(z) between redshifts 0.07 ≤ z ≤ 2.36 and use them to place constraints on model parameters of constant and time-varying dark energy cosmological models, both spatially flat and ...
O. Farooq, Foram Madiyar, Sara Crandall, Bharat Ratra   +3 more
semanticscholar   +1 more source

Dark Energy Survey Year 1 results: measurement of the baryon acoustic oscillation scale in the distribution of galaxies to redshift 1 [PDF]

Monthly notices of the Royal Astronomical Society, 2017
We present angular diameter distance measurements obtained by locating the baryon acoustic oscillations (BAO) scale in the distribution of galaxies selected from the first year of Dark Energy Survey data.
T. Abbott, F. Abdalla, A. Alarcon, S. Allam, F. Andrade-Oliveira, J. Annis, S. Ávila, M. Banerji, N. Banik, K. Bechtol, G. Bernstein, R. Bernstein, E. Bertin, D. Brooks, E. Buckley-Geer, D. Burke, H. Camacho, A. Rosell, M. Kind, J. Carretero, F. Castander, R. Cawthon, K. Chan, M. Crocce, C. Cunha, C. D'Andrea, L. Costa, C. Davis, J. Vicente, D. DePoy, S. Desai, H. Diehl, P. Doel, A. Drlica-Wagner, T. Eifler, J. Elvin-Poole, J. Estrada, A. Evrard, B. Flaugher, P. Fosalba, J. Frieman, J. García-Bellido, E. Gaztañaga, D. Gerdes, T. Giannantonio, D. Gruen, R. Gruendl, J. Gschwend, G. Gutiérrez, W. Hartley, D. Hollowood, K. Honscheid, B. Hoyle, B. Jain, D. James, T. Jeltema, M. Johnson, S. Kent, N. Kokron, E. Krause, K. Kuehn, S. Kuhlmann, N. Kuropatkin, F. Lacasa, O. Lahav, M. Lima, H. Lin, M. Maia, M. Manera, J. Marriner, J. Marshall, P. Martini, Peter Melchior, F. Menanteau, C. Miller, R. Miquel, J. Mohr, E. Neilsen, W. Percival, A. Plazas, A. Porredon, A. Romer, A. Roodman, R. Rosenfeld, A. Ross, E. Rozo, E. Rykoff, M. Sako, E. Sánchez, B. Santiago, V. Scarpine, R. Schindler, M. Schubnell, S. Serrano, I. Sevilla-Noarbe, E. Sheldon, R. C. Smith, M. Smith, F. Sobreira, E. Suchyta, M. Swanson, G. Tarlé, D. Thomas, M. Troxel, D. Tucker, V. Vikram, A. Walker, Risa Wechsler, J. Weller, B. Yanny, Y. Zhang   +110 more
semanticscholar   +1 more source

Bioinspired Stabilization of Fluorescent Au@SiO2 Tracers for Multimodal Biological Imaging

Advanced Functional Materials, EarlyView.
This study demonstrates a bioinspired stabilization strategy for fluorescent gold‐silica nanoparticles. Inspired by natural biosilica maturation, high‐temperature calcination transforms the silica shells, preventing dissolution in cell culture media and intracellular environments.
Wang Sik Lee, Henry Lee, Patricia Taladriz‐Blanco, Dimitri Vanhecke, Barbara Rothen‐Rutishauser, Alke Petri‐Fink   +5 more
wiley   +1 more source