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Article Contents

TITLE PAGE

1.INTRODUCTION

2.WHY A COSMOLOGICAL CONSTANT SEEMS INEVITABLE

3.EFFECTS OF A NON-ZERO COSMOLOGICAL CONSTANT

3.1.Expansion Dynamics

3.2.The Age of the Universe

3.3.Distance Measures

3.4.Comoving Density of Objects

3.5.Growth of Linear Perturbations

3.6.Gravitational Lens Probabilities

4.OBSERVATIONAL STATUS OF THE COSMOLOGICAL CONSTANT

4.1.Existence of High-Redshift Objects

4.2.Age Concordance: Globular Clusters and Cosmic Nuclear Data

4.3.Galaxy Counts as a Function of Redshift or Apparent Magnitude

4.4.Dynamical Tests of

4.5.Quasar Absorption Line Statistics

4.6.Gravitational Lensing

4.7.Astrophysics of Distant Objects

5.POSSIBLE SOLUTIONS TO THE PHYSICIST'S COSMOLOGICAL CONSTANT PROBLEM

5.1.Wormholes and the Cosmological Constant

5.2.Other Explanations

6.CONCLUSIONS

REFERENCES