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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

- P. Mukhopadhyay, A. Nautiyal, +4 authors T. Nathan
- Physics
- 1 August 2003

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… Expand

Deviation from ΛCDM with cosmic strings networks

- Sumit Kumar, A. Nautiyal, Anjan A. Sen
- Physics
- 17 July 2012

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… Expand

Enhanced polarization of CMB from thermal gravitational waves

- K. Bhattacharya, S. Mohanty, A. Nautiyal
- Physics
- 4 July 2006

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… Expand

Enhanced polarization of the cosmic microwave background radiation from thermal gravitational waves.

- K. Bhattacharya, S. Mohanty, A. Nautiyal
- Physics, MedicinePhysical review letters
- 18 December 2006

TLDR

Thawing versus tracker behaviour: observational evidence

- S. Thakur, A. Nautiyal, Anjan A. Sen, T. R. Seshadri
- Physics
- 12 April 2012

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… Expand

Imprint of spatial curvature on inflation power spectrum

- E. Massó, S. Mohanty, A. Nautiyal, G. Zsembinszki
- Physics
- 13 September 2006

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… Expand

Warm natural inflation

- H. Mishra, S. Mohanty, A. Nautiyal
- Physics
- 15 June 2011

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… Expand

Reheating constraints on tachyon inflation

- A. Nautiyal
- PhysicsPhysical Review D
- 8 June 2018

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 $\cosh$… Expand

WMAP Constraints On K-Inflation

- N. Devi, A. Nautiyal, Anjan A. Sen
- Physics
- 25 July 2011

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… Expand

Natural inflation at the GUT scale

- S. Mohanty, A. Nautiyal
- Physics
- 2 July 2008

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… Expand

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