Academic Commons

Theses Doctoral

Topics in vacuum decay

Abad, Ali Masoumi Khalil

If a theory has more than one classically stable vacuum, quantum tunneling and thermal jumps make the transition between the vacua possible. The transition happens through a first order phase transition started by nucleation of a bubble of the new vacuum. The outward pressure of the truer vacuum makes the bubble expand and consequently eat away more of the old phase. In the presence of gravity this phenomenon gets more complicated and meanwhile more interesting. It can potentially have important cosmological consequences. Some aspects of this decay are studied in this thesis. Solutions with different symmetry than the generically used O(4) symmetry are studied and their actions calculated. Vacuum decay in a spatial vector field is studied and novel features like kinky domain walls are presented. The question of stability of vacua in a landscape of potentials is studied and the possible instability in large dimension of fields is shown. Finally a compactification of the Einstein-Maxwell theory is studied which can be a good lab to understand the decay rates in compactification models of arbitrary dimensions.

Subjects

Files

  • thumnail for MasoumiKhalilAbad_columbia_0054D_11613.pdf MasoumiKhalilAbad_columbia_0054D_11613.pdf application/pdf 7.19 MB Download File

More About This Work

Academic Units
Physics
Thesis Advisors
Weinberg, Eric J.
Degree
Ph.D., Columbia University
Published Here
September 16, 2013
Academic Commons provides global access to research and scholarship produced at Columbia University, Barnard College, Teachers College, Union Theological Seminary and Jewish Theological Seminary. Academic Commons is managed by the Columbia University Libraries.