Relic gravity waves from braneworld inflation

By V. Sahni, M. Sami, T. Souradeep. 2001

168 citations recorded by the source corpus.

We discuss a scenario in which extra dimensional effects allow a scalar field with a steep potential to play the dual role of the inflaton as well as dark energy (quintessence). The post-inflationary evolution of the universe in this scenario is generically characterised by a `kinetic regime' during which the kinetic energy of the scalar field greatly exceeds its potential energy resulting in a `stiff' equation of state for scalar field matter $P_\phi \simeq \rho_\phi$. The kinetic regime precedes the radiation dominated epoch and introduces an important new feature into the spectrum of relic gravity waves created quantum mechanically during inflation. The gravity wave spectrum increases with wavenumber for wavelengths shorter than the comoving horizon scale at the commencement of the radiative regime. This `blue tilt' is a generic feature of models with steep potentials and imposes strong constraints on a class of inflationary braneworld models. Prospects for detection of the gravity wave background by terrestrial and space-borne gravity wave observatories such as LIGO II and LISA are discussed.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/fe70b235fe08ae82354fefce3772f25eaf00f447

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Citations in the corpus

Modified Gravity and Cosmology (2011, unknown): “Cosmological perturbations While the theory describing cosmological perturbations in braneworld gravity has been well developed in recent years (see, for example, [842, 771, 847, 334, 1087, 991, 801, 202, 201, 548, 772, 547, 918, 919, 921, 920, 596, 716, 768, 1244, 742, 1245, 703, 705, 715, 769, 597”
Observational constraints on teleparallel dark energy (2011, background): “2) • Inverse hyperbolic cosine potential The use of hyperbolic cosine potential, or power-law functions of it, has also many cosmological implications [86–88].”
Beyond the Standard Models with cosmic strings (2019, background): “There has been a large literature on probes of a non-standard cosmology through the nearly-scale invariant primordial GW spectrum generated during inflation [2–20].”
Brane-World Gravity (2004, background): “This makes slow-roll inflation possible even for potentials that would be too steep in standard cosmology [308, 99, 312, 369, 346, 286, 205].”