Zobrazeno 1 - 10
of 84
pro vyhledávání: '"Sunny Vagnozzi"'
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-11 (2024)
Abstract Mimetic gravity has gained significant appeal in cosmological contexts, but static spherically symmetric space-times within the baseline theory are highly non-trivial: the two natural solutions are a naked singularity and a black hole space-
Externí odkaz:
https://doaj.org/article/1626696179f444399320184618288bed
Publikováno v:
Communications Physics, Vol 7, Iss 1, Pp 1-7 (2024)
Abstract It is important to test the possible existence of fifth forces, as ultralight bosons that would mediate these are predicted to exist in several well-motivated extensions of the Standard Model. Recent work indicated asteroids as promising pro
Externí odkaz:
https://doaj.org/article/beb0b7c1cb7c4aa789d22161104a891a
Autor:
Sunny Vagnozzi
Publikováno v:
Universe, Vol 9, Iss 9, p 393 (2023)
The Hubble tension has now grown to a level of significance which can no longer be ignored and calls for a solution which, despite a huge number of attempts, has so far eluded us. Significant efforts in the literature have focused on early-time modif
Externí odkaz:
https://doaj.org/article/030b1b6b9a974754afb1d2760c337efc
Publikováno v:
The Astrophysical Journal, Vol 944, Iss 2, p 149 (2023)
The Event Horizon Telescope (EHT) collaboration’s image of the compact object at the Galactic center is the first direct evidence of the supermassive black hole (BH) Sgr A*. The shadow of Sgr A* has an angular diameter d _sh = 48.7 ± 7 μ as with
Externí odkaz:
https://doaj.org/article/b3ea149a5cd14e339fedee5690906521
Publikováno v:
Advances in High Energy Physics, Vol 2017 (2017)
Mimetic gravity is a Weyl-symmetric extension of General Relativity, related to the latter by a singular disformal transformation, wherein the appearance of a dust-like perfect fluid can mimic cold dark matter at a cosmological level. Within this fra
Externí odkaz:
https://doaj.org/article/1e75b812c68e40fca1b47746e1f1eb50
Publikováno v:
Symmetry, Vol 11, Iss 8, p 1035 (2019)
Persisting tensions between high-redshift and low-redshift cosmological observations suggest the dark energy sector of the Universe might be more complex than the positive cosmological constant of the Λ CDM model. Motivated by string theory, wherein
Externí odkaz:
https://doaj.org/article/d8857cd5df9c4de79f5396b39653047a
Autor:
Sunny Vagnozzi
Publikováno v:
Atoms, Vol 7, Iss 2, p 41 (2019)
In the past years, a systematic downward revision of the metallicity of the Sun has led to the “solar modeling problem„, namely the disagreement between predictions of standard solar models and inferences from helioseismology. Recent solar wind m
Externí odkaz:
https://doaj.org/article/619b4e499fcd47b6aa5f0c349de8de74
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 520:3688-3695
The early dark energy (EDE) solution to the Hubble tension comes at the cost of an increased clustering amplitude that has been argued to worsen the fit to galaxy clustering data. We explore whether freeing the total neutrino mass $M_{\nu}$, which ca
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2824842d0b3e2f1d78602c22fcfce3a1
https://doi.org/10.1093/mnras/stad317
https://doi.org/10.1093/mnras/stad317
We explore the role of redshift-space galaxy clustering data in constraining non-gravitational interactions between dark energy (DE) and dark matter (DM), for which state-of-the-art limits have so far been obtained from late-time background measureme
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b7f508f1f4e395cf3592504de68bc878
http://hdl.handle.net/10261/330565
http://hdl.handle.net/10261/330565
Autor:
Sunny Vagnozzi
Publikováno v:
Monthly Notices of the Royal Astronomical Society: Letters. 502:L11-L15
The NANOGrav pulsar timing array experiment reported evidence for a stochastic common-spectrum process affecting pulsar timing residuals in its 12.5-year dataset, which might be interpreted as the first detection of a stochastic gravitational wave ba
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9c4c272d81262a4b7f7a93c1c958ec45
https://doi.org/10.1093/mnrasl/slaa203
https://doi.org/10.1093/mnrasl/slaa203