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Autor:
Steigman, Gary, Scherrer, Robert J.
The asymmetry between matter and antimatter is key to the existence and nature of our Universe. A measure of the matter - antimatter asymmetry of the Universe is provided by the present value of the universal ratio of baryons (baryons minus antibaryo
Externí odkaz:
http://arxiv.org/abs/1801.10059
Autor:
Angela Kadenhe-Chiweshe, Michael Baad, Shipra Kaicker, Susan Mathew, Bradley Pua, Shaun Steigman, Catherine McGuinn
Publikováno v:
Journal of Vascular Anomalies, Vol 4, Iss 1, p e061 (2023)
Generalized lymphatic anomaly (GLA) is a morbid condition with few treatment options. Cure is currently not possible, and therefore, treatment is aimed at symptom relief, improving function, and slowing the progression of disease. Despite a recent ex
Externí odkaz:
https://doaj.org/article/1d8f767cbb1e48acbaa730a3567465ca
Autor:
Steigman, Gary
A thermal relic, often referred to as a weakly interacting massive particle (WIMP), is a particle produced during the early evolution of the Universe whose present (relic) abundance depends only on its mass and its thermally averaged annihilation cro
Externí odkaz:
http://arxiv.org/abs/1502.01884
Autor:
Nollett, Kenneth M., Steigman, Gary
Publikováno v:
Phys. Rev. D 91, 083505 (2015)
(abridged) In the presence of a light WIMP (mass m_chi < 30 MeV), there are degeneracies among the WIMP's nature, its couplings to standard model particles, its mass, and the number of equivalent (additional) neutrinos, Delta N_nu. These degeneracies
Externí odkaz:
http://arxiv.org/abs/1411.6005
Autor:
Steigman, Gary, Nollett, Kenneth M.
Very light WIMPs (chi), thermal relics that annihilate late in the early Universe, change the energy and entropy densities at BBN and at recombination. BBN, in combination with the CMB, can remove some of the degeneracies among light WIMPs and equiva
Externí odkaz:
http://arxiv.org/abs/1402.5399
Autor:
Steigman, Gary, Nollett, Kenneth M.
Recent updates to the observational determinations of the primordial abundances of helium and deuterium are compared to the predictions of BBN to infer the universal ratio of baryons to photons (or, the present Universe baryon mass density parameter
Externí odkaz:
http://arxiv.org/abs/1401.5488
Autor:
Nollett, Kenneth M., Steigman, Gary
Publikováno v:
Phys. Rev. D 89, 083508 (2014)
(Abridged) In the presence of a light WIMP (< 30 MeV), there are degeneracies among the nature of the WIMP, its couplings to standard model particles, its mass m_chi, and the number of equivalent neutrinos beyond the standard model, Delta N_nu. These
Externí odkaz:
http://arxiv.org/abs/1312.5725
Autor:
Cain-Trivette, Caitlin J, Robinson, Newell Bryce, Kadenhe-Chiweshe, Angela, Steigman, Shaun, Spigland, Nitsana A
Publikováno v:
Journal of Surgical Case Reports; Sep2024, Vol. 2024 Issue 9, p1-3, 3p
Autor:
Steigman, Gary
Publikováno v:
Phys. Rev. D 87 (2013) 103517
According to conventional wisdom, in the standard model (SM) of particle physics and cosmology the effective number of neutrinos is Neff=3 (more precisely, 3.046). In extensions of the standard model allowing for the presence of DeltaNnu equivalent n
Externí odkaz:
http://arxiv.org/abs/1303.0049