Zobrazeno 1 - 10
of 133
pro vyhledávání: '"Hütsi, Gert"'
Autor:
Gialamas, Ioannis D., Hütsi, Gert, Kannike, Kristjan, Racioppi, Antonio, Raidal, Martti, Vasar, Martin, Veermäe, Hardi
We perform fits to DESI, CMB and supernova data to understand the physical origin of the DESI hint for dynamical dark energy. We find that the linear parametrization of the equation of state $w$ may guide to misleading interpretations, such as the hi
Externí odkaz:
http://arxiv.org/abs/2406.07533
Publikováno v:
A&A 691, A270 (2024)
JWST observations have opened a new chapter in studies of supermassive black holes (SMBHs), stimulating discussion of two puzzles: the abundance of SMBHs in the early Universe and the fraction of dual AGNs. In this paper we argue that the answers to
Externí odkaz:
http://arxiv.org/abs/2403.19650
Autor:
Põder, Sven, Benito, María, Pata, Joosep, Kipper, Rain, Ramler, Heleri, Hütsi, Gert, Kolka, Indrek, Thomas, Guillaume F.
Publikováno v:
A&A, 676 (2023) A134
Our goal is to calculate the circular velocity curve of the Milky Way, along with corresponding uncertainties that quantify various sources of systematic uncertainty in a self-consistent manner. The observed rotational velocities are described as cir
Externí odkaz:
http://arxiv.org/abs/2309.02895
Autor:
Ellis, John, Fairbairn, Malcolm, Franciolini, Gabriele, Hütsi, Gert, Iovino Jr., Antonio, Lewicki, Marek, Raidal, Martti, Urrutia, Juan, Vaskonen, Ville, Veermäe, Hardi
The most conservative interpretation of the nHz stochastic gravitational wave background (SGWB) discovered by NANOGrav and other Pulsar Timing Array (PTA) Collaborations is astrophysical, namely that it originates from supermassive black hole (SMBH)
Externí odkaz:
http://arxiv.org/abs/2308.08546
Autor:
Ellis, John, Fairbairn, Malcolm, Hütsi, Gert, Raidal, Juhan, Urrutia, Juan, Vaskonen, Ville, Veermäe, Hardi
Publikováno v:
Phys. Rev. D 109, L021302, 2024
The NANOGrav Collaboration has recently announced evidence for nHz gravitational waves (GWs), in the form of a Hellings-Downs angular correlation in the common-spectrum process that had been observed previously by them and other Pulsar Timing Arrays
Externí odkaz:
http://arxiv.org/abs/2306.17021
Autor:
Einasto, Jaan, Hütsi, Gert, Liivamägi, Lauri-Juhan, Park, Changbom, Kim, Juhan, Szapudi, Istval, Einasto, Maret
We quantify the evolution of matter and galaxy clustering in cosmological hydrodynamical simulations via correlation and bias functions of matter and galaxies. We use simulations TNG100 and TNG300 with epochs from $z=5$ to $z=0$. We calculate spatial
Externí odkaz:
http://arxiv.org/abs/2304.09035
Autor:
Ellis, John, Fairbairn, Malcolm, Hütsi, Gert, Raidal, Martti, Urrutia, Juan, Vaskonen, Ville, Veermäe, Hardi
Publikováno v:
A&A 676, A38 (2023)
NANOGrav and other Pulsar Timing Arrays (PTAs) have discovered a common-spectrum process in the nHz range that may be due to gravitational waves (GWs): if so, they are likely to have been generated by black hole (BH) binaries with total masses $> 10^
Externí odkaz:
http://arxiv.org/abs/2301.13854
The James Webb Space Telescope has detected surprisingly luminous early galaxies that indicate a tension with the $\Lambda$CDM. Motivated by scenarios including axion miniclusters or primordial black holes, we consider power-law modifications of the
Externí odkaz:
http://arxiv.org/abs/2211.02651
The abundance of dark matter (DM) subhalos orbiting a host galaxy is a generic prediction of the cosmological framework, and is a promising way to constrain the nature of DM. In this paper, we investigate the use of machine learning-based tools to qu
Externí odkaz:
http://arxiv.org/abs/2203.08161
In this reply, we address the comment [arXiv:2105.14908] to our recent paper [arXiv:2105.09328], where we argued that the Thakurta metric does not describe cosmological black holes. We clarify that the mass growth of Thakurta black holes is due to an
Externí odkaz:
http://arxiv.org/abs/2106.02007