Zobrazeno 1 - 10
of 10 608
pro vyhledávání: '"COSMOLOGICAL distances"'
Autor:
Cedola, Nicolò
Aims: we propose that the condition of relative motion between us and the objects that we observe in the Universe should generate relativistic aberration on the photons that such objects emit, varying the observed flux similarly to the cases of blaza
Externí odkaz:
http://arxiv.org/abs/2403.18567
Autor:
Melia, Fulvio
Recent attempts at measuring the variation of $c$ using an assortment of standard candles and the redshift-dependent Hubble expansion rate inferred from the currently available catalog of cosmic chronometers have tended to show that the speed of ligh
Externí odkaz:
http://arxiv.org/abs/2312.09458
Autor:
Dwomoh, Arianna M., Peterson, Erik R., Scolnic, Daniel, Ashall, Chris, DerKacy, James M., Do, Aaron, Johansson, Joel, Jones, David O., Riess, Adam G., Shappee, Benjamin J.
The study of supernova siblings, supernovae with the same host galaxy, is an important avenue for understanding and measuring the properties of Type Ia Supernova (SN Ia) light curves (LCs). Thus far, sibling analyses have mainly focused on optical LC
Externí odkaz:
http://arxiv.org/abs/2311.06178
Autor:
Fairhurst, Stephen, Mills, Cameron, Colpi, Monica, Schneider, Raffaella, Sesana, Alberto, Trinca, Alessandro, Valiante, Rosa
We investigate the detectability of single-event coalescing black hole binaries with total mass of $100-600 M_{\odot}$ at cosmological distances ($5 \lesssim z \lesssim 20$) with the next generation of terrestrial gravitational wave observatories, sp
Externí odkaz:
http://arxiv.org/abs/2310.18158
Autor:
Harada, Junpei
Publikováno v:
Phys. Rev. D 108, 044031 (2023)
Three theoretical criteria for gravitational theories beyond general relativity are considered: obtaining the cosmological constant as an integration constant, deriving the energy conservation law as a consequence of the field equations, rather than
Externí odkaz:
http://arxiv.org/abs/2308.02115
Publikováno v:
MNRAS 526 (3), 3987-3993 (2023)
The co-varying physical couplings (CPC) framework states that physical parameters like the speed of light in vacuum $c$, the Newtonian constant $G$, and the cosmological constant $\Lambda$ could indeed vary with the spacetime coordinates $x^{\mu}$. H
Externí odkaz:
http://arxiv.org/abs/2305.11118
Autor:
Akhshabi, Siamak, Zamani, Saboura
Publikováno v:
Gen Relativ Gravit 55, 102 (2023)
We analyze the measurement of cosmological distances in the presence of torsion in both Einstein-Cartan and Poincare gauge theory of gravity. Using the modified cosmological distance measurements, we use the observed time delays in gravitational lens
Externí odkaz:
http://arxiv.org/abs/2305.00415
Autor:
Diego, Jose M., Meena, Ashish K., Adams, Nathan J., Broadhurst, Tom, Dai, Liang, Coe, Dan, Frye, Brenda, Kelly, Patrick, Koekemoer, Anton M., Pascale, Massimo, Willner, S. P., Zackrisson, Erik, Zitrin, Adi, Windhorst, Rogier A., Cohen, Seth H., Jansen, Rolf A., Summers, Jake, Tompkins, Scott, Conselice, Christopher J., Driver, Simon P., Yan, Haojing, Grogin, Norman, Marshall, Madeline A., Pirzkal, Nor, Robotham, Aaron, Ryan, Jr., Russell E., Willmer, Christopher N. A., Bradley, Larry D., Caminha, Gabriel, Caputi, Karina
Publikováno v:
A&A 672, A3 (2023)
The first JWST data on the massive colliding cluster El Gordo confirm 23 known families of multiply lensed images and identify 8 new members of these families. Based on these families, which have been confirmed spectroscopically by MUSE, we derived a
Externí odkaz:
http://arxiv.org/abs/2210.06514
Autor:
Macpherson, Hayley J.
In this work we present the first results from a new ray-tracing tool to calculate cosmological distances in the context of fully nonlinear general relativity. We use this tool to study the ability of the general cosmographic representation of lumino
Externí odkaz:
http://arxiv.org/abs/2209.06775
Autor:
Torres-Orjuela, Alejandro, Chen, Xian
Standard sirens - GW sources with an EM counterpart - can be used to measure H_0 directly which should help to ease the existing Hubble tension. However, if the source has a relative velocity to the expanding universe on top of its motion due to the
Externí odkaz:
http://arxiv.org/abs/2210.09737