Zobrazeno 1 - 10
of 115
pro vyhledávání: '"Malcolm Fairbairn"'
Publikováno v:
The Astrophysical Journal, Vol 964, Iss 1, p 11 (2024)
The process whereby the supermassive black holes (SMBHs) populating the centers of galaxies have been assembled remains to be established, with the relative importance of seeds provided by collapsed Population III stars, black holes formed in nuclear
Externí odkaz:
https://doaj.org/article/67ff949c8aac4a43ab002fceb516eb99
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 2, Pp 1-6 (2020)
Abstract Big Bang Nucleosynthesis (BBN) is very sensitive to the cosmological expansion rate. If the gravitational constant G took a different value during the nucleosynthesis epoch than today, the primordial abundances of light elements would be aff
Externí odkaz:
https://doaj.org/article/413804a0a74047389604028f5a44944e
Publikováno v:
Journal of High Energy Physics, Vol 2019, Iss 7, Pp 1-52 (2019)
Abstract We study the spectrum of gravitational waves produced by a first order phase transition in a hidden sector that is colder than the visible sector. In this scenario, bubbles of the hidden sector vacuum can be nucleated through either thermal
Externí odkaz:
https://doaj.org/article/857b395e05974ded88a51409e75115ce
Autor:
Malcolm Fairbairn
Publikováno v:
Symmetry, Vol 14, Iss 4, p 812 (2022)
This is a brief review of aspects of galactic astrophysics and astronomy which have a possible bearing on particle dark matter. It is still quite normal for particle physicists to try to solve “well known anomalies“ that are apparently seen in ob
Externí odkaz:
https://doaj.org/article/71760e8637364038945dd54ef4fe3c54
Autor:
Francesca Day, Malcolm Fairbairn
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 6, Pp 1-8 (2018)
Abstract Fluorescent dark matter has been suggested as a possible explanation of both the 3.5 keV excess in the diffuse emission of the Perseus Cluster and of the deficit at the same energy in the central active galaxy within that cluster, NGC 1275.
Externí odkaz:
https://doaj.org/article/b71cd305f9c14a94815542dd42076fb0
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 4, Pp 1-10 (2018)
Abstract We consider the effect of the Gibbons–Hawking radiation on the inflaton in the situation where it is coupled to a large number of spectator fields. We argue that this will lead to two important effects – a thermal contribution to the pot
Externí odkaz:
https://doaj.org/article/4ae677ce9a8c409a895adb115edd4a6b
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 3, Pp 1-9 (2018)
Abstract We explore the constraints imposed by the cancellation of triangle anomalies on models in which the flavour anomalies reported by LHCb and other experiments are due to an extra U(1)$$^\prime $$ ′ gauge boson Z$$^\prime $$ ′ . We assume u
Externí odkaz:
https://doaj.org/article/c0b53524aeb14128ba2a3a7269cde504
Publikováno v:
Journal of High Energy Physics, Vol 2017, Iss 8, Pp 1-19 (2017)
Abstract We explore the anomaly-cancellation constraints on simplified dark matter (DM) models with an extra U(1)′ gauge boson Z ′. We show that, if the Standard Model (SM) fermions are supplemented by a single DM fermion χ that is a singlet of
Externí odkaz:
https://doaj.org/article/ef6c169200c24755a8d8a5ab8949b1e9
Publikováno v:
Journal of High Energy Physics, Vol 2017, Iss 7, Pp 1-29 (2017)
Abstract Hidden sector glueball dark matter is well motivated by string theory, compactifications of which often have extra gauge groups uncoupled to the visible sector. We study the dynamics of glueballs in theories with a period of late time primor
Externí odkaz:
https://doaj.org/article/0d357615ffe549d79fc1086ddecbf775
OJ 287 is a blazar thought to be a binary system containing a ~ 18 billion solar mass primary black hole accompanied by a ~ 150 million solar mass secondary black hole in an eccentric orbit, which triggers electromagnetic flares twice in every ~ 12 y
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::37da949171166b0600ec44c3b5321b89
http://arxiv.org/abs/2207.10021
http://arxiv.org/abs/2207.10021