Results 1 to 10 of about 114,791 (199)

Andromeda’s Parachute: Time Delays and Hubble Constant

open access: yesThe Astrophysical Journal, 2023
The gravitational lens system PS J0147+4630 (Andromeda’s Parachute) consists of four quasar images ABCD and a lensing galaxy. We obtained r -band light curves of ABCD in the 2017−2022 period from monitoring with two 2 m class telescopes.
Vyacheslav N. Shalyapin   +3 more
doaj   +1 more source

Cosmological-model-independent Determination of Hubble Constant from Fast Radio Bursts and Hubble Parameter Measurements

open access: yesThe Astrophysical Journal Letters, 2023
We establish a cosmological-model-independent method to determine the Hubble constant H _0 from the localized fast radio bursts (FRBs) and the Hubble parameter measurements from cosmic chronometers and obtain a first such determination H _0 = 71 ± 3 km s
Yang Liu, Hongwei Yu, Puxun Wu
doaj   +1 more source

The Unsettled Number: Hubble’s Tension

open access: yesUniverse, 2023
One of main sources of uncertainty in modern cosmology is the present rate of the universe’s expansion, H0, called the Hubble constant. Once again, different observational techniques bring about different results, causing new “Hubble tension”.
Jorge L. Cervantes-Cota   +2 more
doaj   +1 more source

Why reducing the cosmic sound horizon alone can not fully resolve the Hubble tension

open access: yesCommunications Physics, 2021
It is generally accepted that the Universe is dominated by dark energy but the different methods to measure the Hubble constant disagree, giving origin to what is known as the "Hubble tension”. The authors demonstrate that the sole reduction of the sound
Karsten Jedamzik   +2 more
doaj   +1 more source

Hubble Tension: The Evidence of New Physics

open access: yesUniverse, 2023
The ΛCDM model provides a good fit to most astronomical observations but harbors large areas of phenomenology and ignorance. With the improvements in the precision and number of observations, discrepancies between key cosmological parameters of this ...
Jian-Ping Hu, Fa-Yin Wang
doaj   +1 more source

A bias using the ages of the oldest astrophysical objects to address the Hubble tension

open access: yesEuropean Physical Journal C: Particles and Fields, 2023
Recently different cosmological measurements have shown a tension in the value of the Hubble constant, $$H_0.$$ H 0 . Assuming the $$\Lambda $$ Λ CDM model, the Planck satellite mission has inferred the Hubble constant from the cosmic microwave ...
André A. Costa, Zelin Ren, Zhixiang Yin
doaj   +1 more source

A Gravitational-wave Measurement of the Hubble Constant Following the Second Observing Run of Advanced LIGO and Virgo

open access: yesThe Astrophysical Journal, 2021
This paper presents the gravitational-wave measurement of the Hubble constant ( H _0 ) using the detections from the first and second observing runs of the Advanced LIGO and Virgo detector network.
B. P. Abbott   +1189 more
doaj   +1 more source

Connecting Infrared Surface Brightness Fluctuation Distances to Type Ia Supernova Hosts: Testing the Top Rung of the Distance Ladder

open access: yesThe Astrophysical Journal, 2023
We compare infrared surface brightness fluctuation (IR SBF) distances measured in galaxies that have hosted type Ia supernovae (SNe Ia) to distances estimated from SNe Ia light-curve fits.
Peter Garnavich   +8 more
doaj   +1 more source

Investigating the Hubble tension: Effect of cepheid calibration

open access: yesPhysics Letters B, 2023
Recent observations of Type Ia supernovae (SNe) by SH0ES collaboration (R11 and R16) diverge from the value reported by recent CMBR observations utilising the Planck satellite and application of the ΛCDM cosmological model by at least 3σ. It is among the
Rahul Kumar Thakur   +4 more
doaj   +1 more source

H0 tension in torsion-based modified gravity

open access: yesNuclear Physics B, 2023
The rising concern in the Hubble constant tension (H0 tension) of the cosmological models motivates the scientific community to search for alternative cosmological scenarios that could resolve the H0 tension.
Sanjay Mandal   +3 more
doaj   +1 more source

Home - About - Disclaimer - Privacy