Large scale structure and supersymmetric inflation without fine tuning

Journal Article · Mon Oct 03 00:00:00 EDT 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.73.1886· OSTI ID:6909820

Dvali, G ^[1]; Shafi, Q; Schaefer, R ^[2]

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1. Dipartimento di Fisica, Universita di Pisa and Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56100, Pisa (Italy)
2. Bartol Research Institute, University of Delaware, Newark, Delaware 19716 (United States)

We explore constraints on the spectral index [ital n] of density fluctuations and the neutrino energy density fraction [Omega][sub [nu]] from observations of large scale structure. The best fits imply [ital n][approx]1 and [Omega][sub [nu]][approx]0.1--0.3, for Hubble constants 40--60 km s[sup [minus]1] Mpc[sup [minus]1]. We present a new class of inflationary models based on realistic supersymmetric grand unified theories (GUTs) which do not have the usual fine tuning'' problems. The amplitude of primordial density fluctuations is found to be [proportional to]([ital M][sub [ital X]]/[ital M][sub [ital P]])[sup 2], where [ital M][sub [ital X]] ([ital M][sub [ital P]]) denote the GUT (Planck) scale. The spectral index [ital n]=0.98, in excellent agreement with the observations.

• DOE Contract Number: FG02-91ER40626
• OSTI ID: 6909820
• Journal Information: Physical Review Letters; (United States), Vol. 73:14; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Pa
ENERGY DENSITY
FLUCTUATIONS
GRAND UNIFIED THEORY
INFLATIONARY UNIVERSE
NEUTRINOS
SUPERSYMMETRY
DENSITY
TUNING
COSMOLOGICAL MODELS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
LEPTONS
MASSLESS PARTICLES
MATHEMATICAL MODELS
PARTICLE MODELS
PHYSICAL PROPERTIES
SYMMETRY
UNIFIED GAUGE MODELS
UNIFIED-FIELD THEORIES
VARIATIONS
662210* - Specific Theories & Interaction Models
Particle Systematics- Unified Theories & Models- (1992-)