منابع مشابه
Natural quintessence with gauge coupling unification.
We show that a positive accelerating universe can be obtained simply by the dynamics of a non-Abelian gauge group. The condensates of the chiral fields obtain a negative power potential below the condensation scale Lambda(c) and allow for a quintessence interpretation of these fields. The only free parameters are N(c), N(f), and the number of dynamically gauge singlet bilinear fields straight p...
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We consider the Wilson Line PNGB which arises in a U(1) gauge theory, abstracted from a latticized, periodically compactified extra dimension U(1). Planck scale breaking of the PNGB’s global symmetry is suppressed, providing natural candidates for the axion and quintessence. We construct an explicit model in which the axion may be viewed as the 5th component of the U(1)Y gauge field in a 1+4 la...
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We formulate conditions for the naturalness of cosmological quintessence scenarios. The quintessence lagrangian is taken to be the sum of a simple exponential potential and a non-canonical kinetic term. This parameterization covers most variants of quintessence and makes the naturalness conditions particularly transparent. Several " natural " scalar models lead, for the present cosmological era...
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This case report looks at a case of traumatic avulsion and subsequent apexification of a maxillary permanent incisor of a 6-year-old boy and a 10-year follow-up is reported. Treatment included apexification of the tooth with incomplete root formation using mineral trioxide aggregate and restoration of the immature root with a zirconia post and a coronal composite restoration. At the 10-year fol...
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In the present case report, a ra re congenital fistula of the accessory parotid gland is discussed, including aetiology, methods and imaging for diagnosis and treatment options.
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2001
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(00)01339-3