Zobrazeno 1 - 10
of 1 402
pro vyhledávání: '"Large-scale structure of the Universe"'
Autor:
Jerzy Kijowski
Publikováno v:
Astronomy, Vol 3, Iss 1, Pp 29-42 (2024)
The notion of a local inertial reference frame is thoroughly analyzed. Dynamics of a field of such frames is derived from the variational principle. It is shown that the resulting theory splits naturally into three sectors, one of which is purely gra
Externí odkaz:
https://doaj.org/article/612586b87c8f427bb56aa659a2656c01
Autor:
Lior Shamir
Publikováno v:
Symmetry, Vol 16, Iss 10, p 1389 (2024)
The asymmetry in the large-scale distribution of the directions in which spiral galaxies rotate has been observed by multiple telescopes, all showing a consistent asymmetry in the distribution of galaxy spin directions as observed from Earth. Here, g
Externí odkaz:
https://doaj.org/article/f9f510adb5464773a9b26f68e9ff9ef9
Autor:
Zhijian Zhang, Weikang Lin
Publikováno v:
The Astrophysical Journal Letters, Vol 973, Iss 2, p L42 (2024)
The suppression of the small-scale matter power spectrum is a distinct feature of warm dark matter (WDM), which permits a constraint on the WDM mass from galaxy surveys. In the thermal relic WDM scenario, quantum statistical effects are not manifest.
Externí odkaz:
https://doaj.org/article/eefa361b28c94af7a1edd41ee2771bb0
Publikováno v:
The Astrophysical Journal Letters, Vol 971, Iss 1, p L22 (2024)
We present the first measurement of the Ly α forest baryon acoustic oscillations (BAO) shift parameter from cosmological simulations. In particular, we generate a suite of 1000 accurate effective field-level bias-based Ly α forest simulations of vo
Externí odkaz:
https://doaj.org/article/87ceade93b25457c81b80be5a958a993
Autor:
Mark J. Henriksen, Prajwal Panda
Publikováno v:
The Astrophysical Journal Letters, Vol 961, Iss 2, p L36 (2024)
We use 3D k -means clustering to characterize galaxy substructure in the A2146 cluster of galaxies ( z = 0.2343). This method objectively characterizes the cluster’s substructure using projected position and velocity data for 67 galaxies within a 2
Externí odkaz:
https://doaj.org/article/fbcb5e0849e2482e8da1c03fa24f1b51
Publikováno v:
Universe, Vol 10, Iss 5, p 193 (2024)
The accelerated expansion of the Universe is impressively well described by a cosmological constant. However, the observed value of the cosmological constant is much smaller than expected based on quantum field theories. Recent efforts to achieve con
Externí odkaz:
https://doaj.org/article/3baf148d8bd545cc81d9e1ea5d38ff48
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 1, p 139 (2024)
We examine the effects of massive primordial black holes (PBHs) on cosmic structure formation, employing both a semianalytical approach and cosmological simulations. Our simulations incorporate PBHs with a monochromatic mass distribution centered aro
Externí odkaz:
https://doaj.org/article/3face07bd1dd40b1a71acf8c660f2f61
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 1, p 64 (2024)
The idea of composite dark energy (DE) is quite natural since on general grounds we expect that the vacuum energy density (associated with the cosmological term Λ) may appear in combination with other effective forms of DE, denoted X . Here we deal
Externí odkaz:
https://doaj.org/article/54486321444047f8ba27c43e9a22ab3c
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 274, Iss 2, p 44 (2024)
Foreground removal presents a significant obstacle in both current and forthcoming intensity-mapping surveys. While numerous techniques have been developed that show promise in simulated data sets, their efficacy often diminishes when they are applie
Externí odkaz:
https://doaj.org/article/b95a6252c90c4addb597b0365573ca3e
Publikováno v:
The Astrophysical Journal, Vol 974, Iss 2, p 175 (2024)
Bursty star formation—a key prediction for high-redshift galaxies from cosmological simulations explicitly resolving stellar feedback in the interstellar medium—has recently been observed to prevail among galaxies at redshift z ≳ 6. Line intens
Externí odkaz:
https://doaj.org/article/c77f9dec735b425abb0882100532db6e