<subfield code="a">The wall of the cave</subfield>
</datafield>
<datafield tag="260" ind1=" " ind2=" ">
<subfield code="c">1994</subfield>
</datafield>
<datafield tag="520" ind1=" " ind2=" ">
<subfield code="a">In this article old and new relations between gauge fields and strings are discussed. We add new arguments that the Yang Mills theories must be described by the non-critical strings in the five dimensional curved space. The physical meaning of the fifth dimension is that of the renormalization scale represented by the Liouville field. We analyze the meaning of the zigzag symmetry and show that it is likely to be present if there is a minimal supersymmetry on the world sheet. We also present the new string backgrounds which may be relevant for the description of the ordinary bosonic Yang-Mills theories. The article is written on the occasion of the 40-th anniversary of the IHES.</subfield>
<subfield code="a">A brief overview of hep-th/0201028 prepared for NATO Advanced Study Institute and EC Summer School on Progress in String, Field and Particle Theory, Cargese, Corsica, France, 25 June - 11 July 2002.</subfield>
<subfield code="u">National Technical University of Athens</subfield>
</datafield>
<datafield tag="245" ind1=" " ind2=" ">
<subfield code="a">Quasinormal Modes of Perturbations of Four-Dimensional Topological Black Holes</subfield>
</datafield>
<datafield tag="260" ind1=" " ind2=" ">
<subfield code="c">2006</subfield>
</datafield>
<datafield tag="269" ind1=" " ind2=" ">
<subfield code="c">10 Jun 2006</subfield>
</datafield>
<datafield tag="300" ind1=" " ind2=" ">
<subfield code="a">17 p</subfield>
</datafield>
<datafield tag="520" ind1=" " ind2=" ">
<subfield code="a">We study the perturbative behaviour of topological black holes with scalar hair. We calculate both analytically and numerically the quasi-normal modes of the electromagnetic perturbations. In the case of small black holes we find clear evidence of a second-order phase transition of a topological black hole to a hairy configuration. We also find evidence of a second-order phase transition of the AdS vacuum solution to a topological black hole.</subfield>