## Roee Steinergraduated email: roees@post.bgu.ac.il |

Advisor: Prof. Eduardo Guendelman

Research Interest:

Initial condition from the action principle and its application to cosmology and to false vacuum bubbles

My proposal is to use and further develop the technique that we have found to produce initial and

boundary conditions from variation of the action. As we will show, we can obtain the scalar field

initial and boundary condition. This technique can be of use for some application in physics as for

example, where we would like it to be at the false vacuum state in inflationary cosmology

concerning the question of the initial state of the Inflaton scalar field, which we take to be a Higgs

field. This tool can be used also for other kind of questions. We explore other kinds of actions where

initial or boundary condition can be obtained from them.

Advisor: Prof. Eduardo Guendelman

Mach Like Principle from Conserved Charges

We studied models where the gauge coupling constants, masses and the gravitational

constant are functions of some conserved charge in the universe, and furthermore a

cosmological constant that depends on the total charge of the universe. We first con-

sider the standard Dirac action, but where the mass and the electromagnetic coupling

constant are a function of the charge in the universe and afterwards extend this to

curved spacetime and consider gauge coupling constants, the gravitation constant and

the mass as a function of the charge of the universe, which represent a sort of Mach

principle for all the constants of nature.

- Initial condition from the action principle and its application to cosmology and to false vacuum bubbles (2013)

E.Guendelman and R.Steiner, Phys.Lett. B724 316-321 - Mach Like Principle from Conserved Charges (2013)

E.Guendelman and R.Steiner, Found.Phys. 43 - Confining Boundary conditions from dynamical Coupling Constants for Abelian and non Abelian symmetries (2014)

E.I. Guendelman, R. Steiner, Int.J.Mod.Phys. A29 1450165 - Confining Boundary conditions from dynamical Coupling Constants (2014)

E.I. Guendelman, R. Steiner, Phys.Lett. B734 245-248 - Consistent gauge interaction involving dynamical coupling and anomalous current (2015)

E.I. Guendelman, R. Steiner, Int.J.Mod.Phys. A30 (2015) 27, 1550177 - General Rule for Boundary conditions from the Action Principle (2015)

R.Steiner, arXiv:1510.05969 [hep-th]