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## Main Question or Discussion Point

**Could the string theory be interpreted as low-energy theory of elementary particles?**

As is known, the theory of strings has many interesting and important possibilities, but it cannot be verified because of the Planckian scale. Does arise the question: is it possible to construct the theory, similar to the existing theory of strings, but accessible for the experimental check?

The present checked theory of the elementary particles – Standard Model - is of order of Compton wavelength scale. Thus, what theory we will obtain, if strings will be of order of Compton wavelength scale and of low energies, which correspond to the usual elementary particles? What we have in the case of the string theory?

**Basic postulates of the theory of the Planckian scale strings**

Enumerate the main of postulates, accepted in the simplest version of the string theory.

1) In nature there are some one-dimensional objects, which are subordinated to relativistic wave equation and therefore called strings.

2) Strings have certain size of the order of [tex]10^{-35} [/tex]m.

3) Strings are characterized by the vibrational energy (which can be converted into the mass).

4) The simplest strings are the open mass-free boson strings.

(Obviously, this means that they must move in the empty space with the speed of light).

5) In nature there are closed strings with different number of loops, which are formed by twirling and closing of the open strings.

(But, let us note that in the theory of strings the reasons for the twirling of the open strings are not known; theory either postulates them or is limited to purely mathematical conversions. Let us note also that such strings cannot obviously move with the speed of light, since the mass of the twirled string remains concentrated in the specific place of space).

6) Masses of the twirled strings are determined by the intensity of oscillations, and spins by a number of loops and by their motion.

7) At least the part of such excited strings must correspond to known elementary particles. (since other particles (e.g. super-particles) cannot be fixed on the usual scale of lengths and energies, we will not speak about them).

8) The theory of strings formally makes possible to construct the gravity equation of Einstein.

**What objects of the usual scale of lengths and energies we can compare to these strings?**

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