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Experimental determination of the thermo-optic coefficient (dn /dT ) and the effective stimulated emission cross-section (σe) of an a -axis cut 1.-at. % doped Nd:GdVO4 crystal at 1.06 μm wavelength
In this paper, we report the experimental determination of the thermo-optical coefficient (dn/dT) and the effective stimulated emission cross-section (σe) at 1064 nm for an a-axis cut 1.3-at.% doped
Deviation from ΛCDM with cosmic strings networks
In this work, we consider a network of cosmic strings to explain a possible deviation from ΛCDM behaviour. We use different observational data to constrain the model and show that a small but
Enhanced polarization of CMB from thermal gravitational waves
If inflation was preceded by a radiation era then at the time of inflation there will exist a decoupled thermal distribution of gravitons. Gravitational waves generated during inflation will be
Enhanced polarization of the cosmic microwave background radiation from thermal gravitational waves.
TLDR
If inflation was preceded by a radiation era, then at the time of inflation there will exist a decoupled thermal distribution of gravitons, which amplifies the B-mode polarization of the cosmic microwave background radiation by an order of magnitude at large angles, which may now be in the range of observability of the Wilkinson Microwave Anisotropy Probe.
Thawing versus tracker behaviour: observational evidence
Currently there are a variety of scalar field models that attempt to explain the late time acceleration of the Universe. This includes the standard canonical and non-canonical scalar field models
Imprint of spatial curvature on inflation power spectrum
If the Universe had a large curvature before inflation there is a deviation from the scale invariant perturbations of the inflaton at the beginning of inflation. This may have some effect on the
Warm natural inflation
Abstract In warm inflation models there is the requirement of generating large dissipative couplings of the inflaton with radiation, while at the same time, not de-stabilising the flatness of the
Reheating constraints on tachyon inflation
Tachyon inflation is one of the most attractive models of noncannonical inflation motivated by string theory. In this work we revisit the constraints on tachyon inflation with inverse $\cosh$
WMAP Constraints On K-Inflation
We study the K-Inflation models where the inflaton field has non-canonical kinetic term. In particular, we consider the Dirac-Born-Infeld (DBI) form for the kinetic energy of the inflaton field. We
Natural inflation at the GUT scale
Natural inflation driven by pseudo-Nambu-Goldstone bosons (PNGB) has a problem that the nearly scale invariant spectrum of density perturbations is attained only when the symmetry breaking scale is
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