Flipped SU(5) predicts delta T/T

Kyae, Bumseok; Shafi, Qaisar

doi:10.1016/j.physletb.2006.03.007

Flipped SU(5) predicts delta T/T

Oct, 2005

14 pages

Published in:

Phys.Lett.B 635 (2006) 247-252

e-Print:

hep-ph/0510105 [hep-ph]

DOI:

10.1016/j.physletb.2006.03.007

Report number:

BA-05-102,
KIAS-P05054

View in:

ADS Abstract Service

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Abstract:

We discuss hybrid inflation in supersymmetric flipped SU(5) model such that the cosmic microwave anisotropy

\delta T/T

is essentially proportional to

(M /M_{P})^2

, where

M

denotes the symmetry breaking scale and

M_{P}

(

=2.4\times 10^{18}

GeV) is the reduced Planck mass. The magnitude of

M

determined from

\delta T/T

measurements can be consistent with the value inferred from the evolution of SU(3) and SU(2) gauge couplings. In other words, one could state that flipped SU(5) predicts (more precisely `postdicts')

\delta T/T

. The scalar spectral index

n_s = 0.993\pm 0.007

, the scalar to tensor ratio satisfies r \lapproxeq 10^{-6}, while dn_s/d{\rm ln}k \lapproxeq 4\times 10^{-4}.

grand unified theory: SU(5) x U(1)
supersymmetry
inflation: hybrid
cosmic background radiation: anisotropy
symmetry breaking
coupling: gauge
Higgs particle: multiplet
numerical calculations

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