Can symmetry non-restoration solve the monopole problem?

Can Symmetry Non-restoration Solve the Monopole Problem ?

We reexamine a recently proposed non-inflationary solution to the monopole problem, based on the possibility that spontaneously broken Grand-Unified symmetries do not get restored at high temperature. We go beyond leading order by studying the self-consistent one-loop equations of the model. We find large next-to-leading corrections that reverse the lowest order results and cause symmetry resto...

Can Counterfactuals Solve the Exclusion Problem?

A quite popular approach to solving the Causal Exclusion Problem is to adopt a counterfactual theory of causation. In this paper, I distinguish three versions of the Causal Exclusion Argument. I argue that the counterfactualist approach can block the first two exclusion arguments, because the Causal Inheritance Principle and the Upward Causation Principle upon which the two arguments are based ...

Symmetry Non Restoration and Inverse Symmetry Breaking on the Lattice

We study the finite temperature symmetry behaviour of O(N1)×O(N2) scalar models on the lattice and we prove that at sufficiently high temperatures and in arbitrary dimensions their full symmetry is always restored or, equivalently, that the phenomenon of Symmetry Non Restoration which, according to lowest order perturbation theory, takes place in the continuum version of these models, does not ...

How to Solve the Non-identity Problem

The non-identity problem arises from the fact that in some situations, our choices determine not only the quality of life that people will enjoy in the future, but the identity of the people who will exist to enjoy it. In such cases, the application of moral principles that seem relatively uncontroversial in more familiar contexts can yield results that most people fi nd unacceptable. The probl...

1 Review of Symmetry Non-restoration and Inverse Symmetry Breaking