Zobrazeno 1 - 10
of 73
pro vyhledávání: '"Paris, Mark W."'
In big bang nucleosynthesis (BBN), the deuterium-tritium (DT) fusion reaction, D(T,n)$\alpha$, enhanced by the 3/2$^+$ resonance, is responsible for 99% of primordial $^4$He. This has been known for decades and has been well documented in the scienti
Externí odkaz:
http://arxiv.org/abs/2305.00647
Autor:
Grohs, Evan B., Bond, J. Richard, Cooke, Ryan J., Fuller, George M., Meyers, Joel, Paris, Mark W.
There exist a range of exciting scientific opportunities for Big Bang Nucleosynthesis (BBN) in the coming decade. BBN, a key particle astrophysics "tool" for decades, is poised to take on new capabilities to probe beyond standard model (BSM) physics.
Externí odkaz:
http://arxiv.org/abs/1903.09187
Publikováno v:
Phys. Rev. C 97, 024603 (2018)
We study derivatives of the shift and penetration factors of collision theory with respect to energy, angular momentum, and charge. Definitive results for the signs of these derivatives are found for the repulsive Coulomb case. In particular, we find
Externí odkaz:
http://arxiv.org/abs/1708.07554
We investigate the stability, with respect to spatial inhomogeneity, of a two-dimensional dense neutrino gas. The system exhibits growth of seed inhomogeneity due to nonlinear coherent neutrino self-interactions. In the absence of incoherent collisio
Externí odkaz:
http://arxiv.org/abs/1706.07052
Publikováno v:
Phys. Rev. D 95, 063503 (2017)
We calculate Boltzmann neutrino energy transport with self-consistently coupled nuclear reactions through the weak-decoupling-nucleosynthesis epoch in an early universe with significant lepton numbers. We find that the presence of lepton asymmetry en
Externí odkaz:
http://arxiv.org/abs/1612.01986
Publikováno v:
Phys. Rev. D 94, 083505 (2016)
We investigate neutrino flavor transformation in the early universe in the presence of a lepton asymmetry, focusing on a two-flavor system with 1 - 3 mixing parameters. We identify five distinct regimes that emerge in an approximate treatment neglect
Externí odkaz:
http://arxiv.org/abs/1608.01336
Publikováno v:
Phys. Rev. C 89, 014623 (2014)
We study the zero channel radius limit of Wigner's R-matrix theory for two cases, and show that it corresponds to non-relativistic effective quantum field theory. We begin with the simple problem of single-channel n-p elastic scattering in the 1S0 ch
Externí odkaz:
http://arxiv.org/abs/1308.0348
Recent activity in solving the 'lithium problem' in big bang nucleosynthesis has focused on the role that putative resonances may play in resonance-enhanced destruction of 7Li. Particular attention has been paid to the reactions involving the 9B comp
Externí odkaz:
http://arxiv.org/abs/1304.3153
A unified description of single-pion photoproduction data, together with pion- and eta-hadroproduction data, has been achieved in a Chew-Mandelstam parametrization which is consistent with unitarity at the two-body level. Energy-dependent and single-
Externí odkaz:
http://arxiv.org/abs/1202.0845
Autor:
Paris, Mark W.
The Low equation is derived in a functional approach to the reduction of the S matrix in the canonical formalism. This establishes the vacuum expectation value of the scattering matrix as the generating functional of non-forward Green functions, with
Externí odkaz:
http://arxiv.org/abs/1109.3164