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Brane world generated dynamically from string type IIB matrices

Nishimura1, Vernizzi

  • 1The Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen O, Denmark.

Physical Review Letters
|November 18, 2000
PubMed
Summary

A new dynamical mechanism proposes a flat four-dimensional spacetime brane in type IIB superstring theory. This uses the chiral fermion integral phase from IKKT matrix theory, revealing a dynamically appearing lower-dimensional brane.

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Area of Science:

  • Theoretical Physics
  • String Theory
  • High Energy Physics

Background:

  • Type IIB superstring theory is a leading candidate for a quantum theory of gravity.
  • The IKKT (Ishibashi-Kawai-Kitazawa-Tsuchiya) matrix model offers a potential nonperturbative definition of type IIB string theory.
  • Brane-world scenarios explore the possibility of our observable universe being a lower-dimensional brane embedded in higher dimensions.

Purpose of the Study:

  • To propose and investigate a dynamical mechanism for realizing a flat four-dimensional spacetime as a brane within type IIB superstring theory.
  • To explore the role of the chiral fermion integral phase in the IKKT matrix theory in this mechanism.
  • To examine the implications for constructing realistic brane-world models.

Main Methods:

Related Experiment Videos

  • Investigated a dynamical mechanism for brane realization in string theory.
  • Studied the phase of the chiral fermion integral within the IKKT matrix theory.
  • Analyzed a simplified model to demonstrate the emergence of a lower-dimensional brane.

    • Main Results:

    • A dynamical mechanism was proposed to realize a flat four-dimensional spacetime brane.
    • The phase of the chiral fermion integral in the IKKT matrix theory plays a crucial role.
    • A simplified model successfully demonstrated the dynamic appearance of a lower-dimensional brane.

    Conclusions:

    • The proposed dynamical mechanism offers a novel approach to constructing brane-world scenarios in string theory.
    • The findings suggest a connection between nonperturbative string theory definitions and the emergence of spacetime structures.
    • Further implications for model building in brane-world cosmology are discussed.