Zobrazeno 1 - 10
of 156
pro vyhledávání: '"Marek Biesiada"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 1, Pp 1-11 (2024)
Abstract The different spatial curvatures of the universe affect the measurement of cosmological distances, which may also contribute to explaining the observed dimming of type Ia supernovae. This phenomenon may be caused by the opacity of the univer
Externí odkaz:
https://doaj.org/article/f631f152153e4c0fbcae832e6583ce67
Publikováno v:
The Astrophysical Journal Letters, Vol 965, Iss 1, p L11 (2024)
In this Letter, we propose a model-independent method to determine the Hubble constant and curvature simultaneously by taking advantage of the possibilities of future spaceborne gravitational-wave detector DECIGO in combination with the radio quasars
Externí odkaz:
https://doaj.org/article/8a384f0cdfe540448fe7a1203ceb1230
Publikováno v:
Physics Letters B, Vol 845, Iss , Pp 138166- (2023)
In this letter, we propose an improved cosmological model independent method of determining the value of the Hubble constant H0. The method uses unanchored luminosity distances H0dL(z) from SN Ia Pantheon data combined with angular diameter distances
Externí odkaz:
https://doaj.org/article/4a1f7cc33626465595b4043a70ca1d04
Publikováno v:
The Astrophysical Journal, Vol 966, Iss 1, p 19 (2024)
The Omh ^2 ( z _i , z _j ) two-point diagnostics was proposed as a litmus test of the ΛCDM model, and measurements of the cosmic expansion rate H ( z ) have been extensively used to perform this test. The results obtained so far suggested a tension
Externí odkaz:
https://doaj.org/article/8295a1dde3dc4b898e207d9301e556b7
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 271, Iss 2, p 53 (2024)
Extracting precise stellar labels is crucial for large spectroscopic surveys like the Sloan Digital Sky Survey (SDSS) and APOGEE. In this paper, we report the newest implementation of StellarGAN, a data-driven method based on generative adversarial n
Externí odkaz:
https://doaj.org/article/f14846ec6fbc41f5a8ff39e4db6f3c06
Autor:
Sreekanth Harikumar, Marek Biesiada
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 3, Pp 1-6 (2022)
Abstract Scalar tensor vector gravity (STVG) is a fully covariant Lorentz invariant alternative theory of gravity also known as MOdified Gravity (MOG) which modifies General Relativity by inclusion of dynamical massive vector field and scalar fields.
Externí odkaz:
https://doaj.org/article/3b9fa8b36e004aec9f94588ddf71ddab
Autor:
Margherita Grespan, Marek Biesiada
Publikováno v:
Universe, Vol 9, Iss 5, p 200 (2023)
The first successful detection of gravitational waves (GWs) opened up a new window to study a realm of the most violent phenomena in the universe, such as coalescences of binary black holes (BH–BH), binary neutron stars (NS–NS), and mixed (BH–N
Externí odkaz:
https://doaj.org/article/c3ec3adc6b824d4bbf882738463dbebd
Autor:
Xiaogang Zheng, Shuo Cao, Yuting Liu, Marek Biesiada, Tonghua Liu, Shuaibo Geng, Yujie Lian, Wuzheng Guo
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 1, Pp 1-9 (2021)
Abstract In order to estimate cosmic curvature from cosmological probes like standard candles, one has to measure the luminosity distance $$D_L(z)$$ D L ( z ) , its derivative with respect to redshift $$D'_L(z)$$ D L ′ ( z ) and the expansion rate
Externí odkaz:
https://doaj.org/article/6efdbd7b5e544ff8aac336afde7115a0
Publikováno v:
The Astrophysical Journal, Vol 949, Iss 2, p 57 (2023)
The possible time variation of the fundamental constants of nature has been an active subject of research in modern physics. In this paper, we propose a new method to investigate such possible time variation of the speed of light c using the updated
Externí odkaz:
https://doaj.org/article/047292d1e95a433b801a1df0ac0e8e51
Autor:
Xiaogang Zheng, Jing-Zhao Qi, Shuo Cao, Tonghua Liu, Marek Biesiada, Sylwia Miernik, Zong-Hong Zhu
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 7, Pp 1-8 (2019)
Abstract The gas depletion factor $$\gamma (z)$$ γ(z) , i.e., the average ratio of the gas mass fraction to the cosmic mean baryon fraction of galaxy clusters, plays a very important role in the cosmological application of the gas mass fraction meas
Externí odkaz:
https://doaj.org/article/b08bd96b444040f59055ef97026edc8c