Light like segment compactification and braneworlds with dynamical string tension

Braneworld scenarios appear in dynamical string tension theories, where is positive between two surfaces separated by a short distance and at the themselves tensions become infinite, therefore producing an effective confinement of strings all matter gravity to space these surfaces. The specific model studied context modified measure formulation as additional degree freedom are not universal, but rather each generates its own tension, which can have different value for string. We consider new background field that couple strings, scalar capable then changing locally along world sheet object changes accordingly sheet. Sting appears dynamically has characteristic constant integration consequence generation . When many types probing same region considered this constrained requirement quantum conformal invariance. For case with generated (characterized constants integration) , there metrics, associated satisfy vacuum Einsteins equations consistency determine behaves. metrics flat Minkowshi after special transformation, confined inside light like Segment or alternatively expanding Braneworlds bubbles.