Zobrazeno 1 - 10
of 38 340
pro vyhledávání: '"fine-structure constant"'
Autor:
Lee, Chung-Chi, Webb, John K., Dougan, Darren, Dzuba, Vladimir A., Flambaum, Victor V., Milaković, Dinko
Searches for variations of fundamental constants require a comprehensive understanding of measurement errors. This paper examines a source of error that is usually overlooked: the impact of continuum placement error. We investigate the problem using
Externí odkaz:
http://arxiv.org/abs/2410.01849
Autor:
Ferreira, Marcelo, Holanda, Rodrigo F. L., Gonzalez, Javier E., Colaço, L. R., Nunes, Rafael C.
Testing possible variations in fundamental constants of nature is a crucial endeavor in observational cosmology. This paper investigates potential cosmological variations in the fine structure constant ($\alpha$) through a non-parametric approach, us
Externí odkaz:
http://arxiv.org/abs/2410.21542
The [O III] $\lambda\lambda\ 4960,5008$ emission lines in the optical spectra of galaxies and quasars have been widely used to investigate the possible variation of the fine-structure constant $\alpha$ over cosmic time. In this work, we utilize the L
Externí odkaz:
http://arxiv.org/abs/2409.01554
Autor:
Beeks, Kjeld, Kazakov, Georgy A., Schaden, Fabian, Morawetz, Ira, de Col, Luca Toscani, Riebner, Thomas, Bartokos, Michael, Sikorsky, Tomas, Schumm, Thorsten, Zhang, Chuankun, Ooi, Tian, Higgins, Jacob S., Doyle, Jack F., Ye, Jun, Safronova, Marianna S.
State-resolved laser spectroscopy at the 10$^{-12}$ precision level recently reported in $arXiv$:2406.18719 determined the fractional change in nuclear quadrupole moment between the ground and isomeric state of $^{229}\rm{Th}$, $\Delta Q_0/Q_0$=1.791
Externí odkaz:
http://arxiv.org/abs/2407.17300
The search for a space-time variation of the fundamental constants has been explored over the years to test our physical theories. In this paper, we use the dispersion measure ($DM$) of fast radio bursts (FRB) combined with type Ia supernovae (SNe) d
Externí odkaz:
http://arxiv.org/abs/2406.11691
Autor:
Dzuba, V. A., Flambaum, V. V.
Highly charged ions of heavy actinides from uranium to einsteinium are studied theoretically to find optical transitions sensitive to the variation of the fine structure constant. A number of promising transitions have been found in ions with ionisat
Externí odkaz:
http://arxiv.org/abs/2405.11839
Publikováno v:
Eur. Phys. J. A (2024) 60:200
We study the fine-structure constant dependence of the rates of some selected radiative capture reactions within the framework of so-called Halo Effective Field Theory in order to assess the adequacy of some assumptions made on the Coulomb penetrabil
Externí odkaz:
http://arxiv.org/abs/2405.09971
Autor:
Jiang, Linhua, Fu, Shuqi, Wang, Feige, Bosman, Sarah E. I., Cai, Zheng, Jun, Hyunsung D., Pan, Zhiwei, Sun, Fengwu, Yang, Jinyi, Zhang, Huanian
We present constraints on the spacetime variation of the fine-structure constant $\alpha$ at redshifts $3
Externí odkaz:
http://arxiv.org/abs/2405.08977
Autor:
Jiang, Linhua, Pan, Zhiwei, Aguilar, Jessica Nicole, Ahlen, Steven, Blum, Robert, Brooks, David, Claybaugh, Todd, de la Macorra, Axel, Dey, Arjun, Doel, Peter, Fanning, Kevin, Ferraro, Simone, Forero-Romero, Jaime E., Gaztanaga, Enrique, Gontcho, Satya Gontcho A, Gutierrez, Gaston, Honscheid, Klaus, Juneau, Stephanie, Landriau, Martin, Guillou, Laurent Le, Levi, Michael, Manera, Marc, Miquel, Ramon, Moustakas, John, Mueller, Eva-Maria, Munoz-Gutierrez, Andrea, Myers, Adam, Nie, Jundan, Niz, Gustavo, Poppett, Claire, Prada, Francisco, Rezaie, Mehdi, Rossi, Graziano, Sanchez, Eusebio, Schlafly, Edward, Schubnell, Michael, Seo, Hee-Jong, Sprayberry, David, Tarle, Gregory, Weaver, Benjamin Alan, Zou, Hu
We present strong constraints on the spacetime variation of the fine-structure constant $\alpha$ using the Dark Energy Spectroscopic Instrument (DESI). In this pilot work, we utilize $\sim110,000$ galaxies with strong and narrow O III $\lambda\lambda
Externí odkaz:
http://arxiv.org/abs/2404.03123
Autor:
Salmon, Fabien1 Salmon.Fabien@yahoo.com
Publikováno v:
Journal of Physical Science. 2023, Vol. 34 Issue 1, p21-26. 6p.
