0 v 2 1 6 Ja n 20 04 Holography , Entropy and Extra Dimensions
نویسنده
چکیده
We show that higher dimensional models (brane worlds) in which the scale of quantum gravity M∗ is much smaller than the apparent scale MP ∼ 1019 GeV violate the covariant entropy bound arising from holography. The thermodynamic entropies of astrophysical black holes and sub-horizon volumes during big bang nucleosynthesis exceed the relevant bounds unless M∗ > 10 (4−6) TeV, so a hierarchy relative to the weak scale is unavoidable. We discuss the implications for extra dimensions as well as holography. [email protected] [email protected]
منابع مشابه
ar X iv : h ep - p h / 03 08 29 0 v 1 2 9 A ug 2 00 3 Holography , Entropy and Extra Dimensions
We show that higher dimensional models (brane worlds) in which the scale of quantum gravity M∗ is much smaller than the apparent scale MP ∼ 1019 GeV are in conflict with bounds arising from holography and black hole entropy. The thermodynamic entropy of astrophysical black holes and sub-horizon volumes during big bang nucleosynthesis exceed the relevant bounds unless M∗ > 10 (4−6) TeV, so a hie...
متن کاملar X iv : h ep - t h / 03 11 02 3 v 2 2 6 Ja n 20 04 SUBATECH – 2003 – 06 Weak Supersymmetry
We explore “weak” supersymmetric systems whose algebra involves, besides Poincare generators, extra bosonic generators not commuting with supercharges. This allows one to have inequal number of bosonic and fermionic 1–particle states in the spectrum. Coleman–Mandula and Haag–Lopuszanski–Sohnius theorems forbid the presence of such extra bosonic charges in interacting theory for d ≥ 3. However, ...
متن کاملar X iv : h ep - p h / 02 02 19 1 v 1 2 0 Fe b 20 02 DPNU - 02 - 04 Fermion Mass Hierarchy in 6 dimensional SO ( 10 ) SUSY GUT
We suggest simple models which produce the suitable fermion mass hierarchies and flavor mixing angles based on the supersymmetric SO(10) grand unified theory in 6 dimensions compactified on a T 2 /Z 2 orbifold. The gauge and Higgs fields propagate in 6 dimensions while ordinal chiral matter fields are localized in 4 dimensions. We introduce extra vector-like heavy fields in the extra dimensions...
متن کامل2 00 4 Holography , Entropy and Extra Dimensions
We show that higher dimensional models (brane worlds) in which the scale of quantum gravity M∗ is much smaller than the apparent scale MP ∼ 1019 GeV violate the covariant entropy bound arising from holography. The thermodynamic entropies of astrophysical black holes and sub-horizon volumes during big bang nucleosynthesis exceed the relevant bounds unless M∗ > 10 (4−6) TeV, so a hierarchy relati...
متن کامل0 v 1 1 2 Ja n 20 04 Closed relativistic string carrying pointlike mass
For the closed relativistic string carrying a pointlike mass the exact solutions of the dynamical equations are obtained and studied. These solutions describe states of the mentioned system moving in Minkowski space and also in the space that is the direct product of Minkowski space and a compact manifold (torus). We consider the closed relativistic string with one massive point (homeomorphic t...
متن کامل