Publications

Listed below are our publications in reverse chronological order.

Preprints

  1. D. J. Stargen, V. Sreenath and L. Sriramkumar, Quantum-to-classical transition and imprints of wavefunction collapse in bouncing universes, arXiv:1605.07311v2 [gr-qc].

Publications in refereed journals

As articles and letters

  1. R. N. Raveendran, D. Chowdhury and L. Sriramkumar, Viable tensor-to-scalar ratio in a symmetric matter bounce, arXiv:1703.10061 [gr-qc], to appear in JCAP.
  2. D. J. Stargen, N. Kajuri and L. Sriramkumar, Response of a rotating detector coupled to a polymer quantized field, Phys. Rev. D 96, 066002 (2017) [arXiv:1706.05834 [gr-qc]].
  3. R. N. Raveendran and L. Sriramkumar, Numerical evaluation of the tensor bispectrum in two field inflation, JCAP 1707, 035 (2017) [arXiv:1611.00473 [astro-ph.CO]].
  4. D. Chowdhury, V. Sreenath and L. Sriramkumar, The scalar-scalar-tensor inflationary three-point function in the axion monodromy model, JCAP 1611, 041 (2016) [arXiv:1605.05292 [astro-ph.CO]].
  5. D. Chowdhury, L. Sriramkumar and R. K. Jain, Duality and the generation of magnetic fields in bouncing universes, Phys. Rev. D 94, 083512 (2016) [arXiv:1604.02143 [gr-qc]].
  6. D. J. Stargen, D. Kothawala and L. Sriramkumar, Moving mirrors and the fluctuation-dissipation theorem, Phys. Rev. D 94, 025040 (2016) [arXiv:1602.02526 [hep-th]].
  7. D. Chowdhury, V. Sreenath and L. Sriramkumar, The tensor bi-spectrum in a matter bounce, JCAP 1511, 002 (2015) [arXiv:1506.06475 [astro-ph.CO]].
  8. L. Sriramkumar, K. Atmjeet and R. K. Jain, Generation of scale invariant magnetic fields in bouncing universes, JCAP 1509, 010 (2015) [arXiv:1504.06853 [astro-ph.CO]].
  9. V. Sreenath, D. K. Hazra and L. Sriramkumar, On the scalar consistency relation away from slow roll, JCAP 1502, 029 (2015) [arXiv:1410.0252 [astro-ph.CO]].
  10. V. Sreenath and L. Sriramkumar, Examining the consistency relations describing the three-point functions involving tensors, JCAP 1410, 021 (2014) [arXiv:1406.1609 [astro-ph.CO]].
  11. J. Martin, L. Sriramkumar and D. K. Hazra, Sharp inflaton potentials and bi-spectra: Effects of smoothening the discontinuity, JCAP 1409, 039 (2014) [arXiv:1404.6093 [astro-ph.CO]].
  12. V. Sreenath, R. Tibrewala and L. Sriramkumar, Numerical evaluation of the three-point scalar-tensor cross-correlations and the tensor bi-spectrum, JCAP 1312, 037 (2013) [arXiv:1309.7169 [astro-ph.CO] ].
  13. D. K. Hazra, L. Sriramkumar and J. Martin, BINGO: A code for the efficient computation of the scalar bi-spectrum, JCAP 1305, 026, (2013) [arXiv:1201.0926].
  14. M. Aich, D. K. Hazra, L. Sriramkumar and T. Souradeep, Oscillations in the inflaton potential: Complete numerical treatment and comparison with the recent and forthcoming CMB datasets, Phys. Rev. D 87, 083526 (2013) [arXiv:1106.2798 [astro-ph.CO]].
  15. D. K. Hazra, J. Martin and L. Sriramkumar, Scalar bi-spectrum during preheating in single field inflationary models, Phys. Rev. D 86, 063523 (2012) [arXiv:1206.0442].
  16. J. Martin and L. Sriramkumar, The scalar bi-spectrum in the Starobinsky model: The equilateral case, JCAP 1201, 008 (2012) [arXiv:1109.5838 [astro-ph.CO]].
  17. R. K. Jain, P. Chingangbam and L. Sriramkumar, Reheating in tachyonic inflationary models: Effects on the large scale curvature perturbations, Nucl. Phys. B 852, 366 (2011) [arXiv:0902.1067 [astro-ph.CO]].
  18. S. Gutti, S. Kulkarni and L. Sriramkumar, Modified dispersion relations and the response of the rotating Unruh-DeWitt detector, Phys. Rev. D 83, 064011 (2011) [arXiv:1005.1807 [gr-qc]].
  19. D. K. Hazra, M. Aich, R. K. Jain, L. Sriramkumar and T. Souradeep, Primordial features due to a step in the inflaton potential, JCAP 1010, 008 (2010) [arXiv:1005.2175 [astro-ph.CO]].
  20. S. Unnikrishnan and L. Sriramkumar, A note on perfect scalar fields, Phys. Rev. D 81, 103511 (2010) [arXiv:1002.0820 [astro-ph.CO]].
  21. R. K. Jain, P. Chingangbam, L. Sriramkumar and T. Souradeep, The tensor-to-scalar ratio in punctuated inflation, Phys. Rev. D 82, 023509 (2010) [arXiv:0904.2518 [astro-ph.CO]].
  22. D. A. Kothawala, L. Sriramkumar, S. Shankaranarayanan and T. Padmanabhan, Path integral duality modified propagators in spacetimes with constant curvature, Phys. Rev. D 80, 044005 (2009) [arXiv:0904.3217 [hep-th]].
  23. R. K. Jain, P. Chingangbam, J.-O. Gong, L. Sriramkumar and T. Souradeep, Punctuated inflation and the low CMB multipoles, JCAP 0901, 009 (2009) [arXiv:0809.3915 [astro-ph]].
  24. D. A. Kothawala, S. Shankaranarayanan and L. Sriramkumar, Quantum gravitational corrections to the stress-energy tensor around the BTZ black hole, JHEP 0809, 095 (2008) [arXiv:0801.0225 [hep-th]].
  25. S. Sarkar, S. Shankaranarayanan and L. Sriramkumar, Sub-leading contributions to the black hole entropy in the brick wall approach, Phys. Rev. D 78, 024003 (2008) [arXiv:0710.2013 [gr-qc]].
  26. R. K. Jain, P. Chingangbam and L. Sriramkumar, On the evolution of tachyonic perturbations at super-Hubble scales, JCAP 10, 003 (2007) [arXiv:astro-ph/0703762].
  27. H. K. Jassal and L. Sriramkumar, Entropy of BTZ black strings in the brick wall approach, Class. Quantum Grav. 24, 2589 (2007) [arXiv:gr-qc/0611102].
  28. L. Sriramkumar and S. Shankaranarayanan, Path integral duality and Planck scale corrections to the primordial spectrum in exponential inflation, JHEP 0612, 050 (2006) [arXiv:hep-th/0608224].
  29. L. Sriramkumar and T. Padmanabhan, Initial state of matter fields and trans-Planckian physics: Can CMB observations disentangle the two?, Phys. Rev. D 71, 103512 (2005) [arXiv:gr-qc/0408034].
  30. S. Shankaranarayanan and L. Sriramkumar, Trans-Planckian corrections to the primordial spectrum in the infra-red and the ultra-violet, Phys. Rev. D 70, 123520 (2004) [arXiv:hep-th/0403236].
  31. L. Sriramkumar, Interpolating between the Bose-Einstein and the Fermi-Dirac distributions in odd dimensions, Gen. Rel. Grav. 35, 1699 (2003) [arXiv:gr-qc/0212084].
  32. L. Sriramkumar, Odd statistics in odd dimensions for odd couplings, Mod. Phys. Lett. A 17, 1059 (2002) [arXiv:gr-qc/0206048].
  33. L. Sriramkumar, Fluctuations in the current and energy densities around a magnetic-flux-carrying cosmic string, Class. Quantum Grav. 18, 1015 (2001) [arXiv:gr-qc/0011074].
  34. G. Gour and L. Sriramkumar, Will small particles exhibit Brownian motion in the quantum vacuum?, Found. Phys. 29, 1917 (1999) [arXiv:quant-ph/9808032].
  35. L. Sriramkumar, On the response of detectors in classical electromagnetic backgrounds, Mod. Phys. Lett. A 14, 1869 (1999) [arXiv:hep-th/9811250].
  36. K. Srinivasan, L. Sriramkumar and T. Padmanabhan, Hypothesis of path integral duality II: Corrections to quantum field theoretic results, Phys. Rev. D 58, 044009 (1998) [arXiv:gr-qc/9710104].
  37. K. Srinivasan, L. Sriramkumar and T. Padmanabhan, Possible quantum interpretation of certain power spectra in classical field theory, Int. J. Mod. Phys. D 6, 607 (1997) [arXiv:gr-qc/9606017].
  38. K. Srinivasan, L. Sriramkumar and T. Padmanabhan, Plane waves viewed from an accelerated frame: Quantum physics in a classical setting, Phys. Rev. D 56, 6692 (1997).
  39. L. Sriramkumar, Limits on the validity of the semiclassical theory - A minisuperspace example, Int. J. Mod. Phys. D 6, 363 (1997) [arXiv:gr-qc/9505037].
  40. L. Sriramkumar, R. Mukund and T. Padmanabhan, Non-trivial classical backgrounds with vanishing quantum corrections, Phys. Rev. D 55, 6147 (1997) [arXiv:hep-th/9703034].
  41. L. Sriramkumar and T. Padmanabhan, Does a nonzero tunneling probability imply particle production in time-independent classical electromagnetic backgrounds?, Phys. Rev. D 54, 7599 (1996) [arXiv:hep-th/9604111].
  42. L. Sriramkumar and T. Padmanabhan, Finite-time response of inertial and uniformly accelerated Unruh-DeWitt detectors, Class. Quantum Grav. 13, 2061 (1996) [arXiv:gr-qc/9408037].

As reviews

  1. L. Sriramkumar, An introduction to inflation and cosmological perturbation theory, Curr. Sci. 97, 868 (2009) [arXiv:0904.4584 [astro-ph.CO]].
  2. L. Sriramkumar and T. Padmanabhan, Probes of the vacuum structure of quantum fields in classical backgrounds, Int. J. Mod. Phys. D 11, 1 (2002) [arXiv:gr-qc/9903054].

Publications in proceedings of conferences

  1. L. Sriramkumar, Primordial gravitational waves, BICEP2 and beyond, in Proceedings of the International Workshop on Unification and Cosmology after Higgs Discovery and BICEP2 (Department of Physics, Panjab University, Chandigarh, May 13-15, 2014), Pramana 86, 325-333 (2016).
  2. D. A. Kothawala, S. Shankaranarayanan and L. Sriramkumar, Quantum gravitational corrections to the propagator in spacetimes with constant curvature, in Proceedings of the Twelfth Marcel Grossmann Meeting on General Relativity (UNESCO Headquarters, Paris, France, July 12-18, 2009), Eds. T. Damour, R. Jantzen and R. Ruffini (World Scientific, Singapore, 2012), pp. 2426-2428 [arXiv:1002.1132 [hep-th]].
  3. S. Sarkar, S. Shankaranarayanan and L. Sriramkumar, Corrections to the Bekenstein-Hawking entropy in the brick wall approach, in Proceedings of the Meeting on Black Holes in General Relativity and String Theory (Veli Losinj, Croatia, August 24-30, 2008), PoS (BHs, GR and Strings) 035 (2009).
  4. S. Shankaranarayanan and L. Sriramkumar, Planck scale effects and the suppression of power on the large scales in the primordial spectrum, in Proceedings of the Tenth International Symposium on Particles, Strings and Cosmology (Northeastern University, Boston, U.S.A., August 16-22, 2004), Eds. G. Alverson, E. Barberis, P. Nath and M. T. Vaughn (World Scientific, Singapore, 2004), pp. 38-42 [arXiv:hep-th/0410072].
  5. L. Sriramkumar, T. Padmanabhan and R. Mukund, Classical backgrounds with vanishing effective Lagrangians, in Proceedings of the Eighth Marcel Grossmann Meeting on General Relativity (Hebrew University, Jerusalem, Israel, June 22-27, 1997), Ed. T. Piran (World Scientific, Singapore, 1999), pp. 833-835.

Unpublished article

  1. L. Sriramkumar, Superfluid helicity and vortex reconnections.

Other articles

  1. L. Sriramkumar, What do detectors detect?, in Gravity and the Quantum, Eds. J. S. Bagla and S. Engineer (Springer, Berlin, 2017), pp. 457-478 [arXiv:1612.08579 [gr-qc]].
  2. L. Sriramkumar, On the generation and evolution of perturbations during inflation and reheating, in Vignettes in Gravitation and Cosmology, Eds. L. Sriramkumar and T. R. Seshadri (World Scientific, Singapore, 2012), pp. 207-249.

Books edited

  1. L. Sriramkumar and T. R. Seshadri (Editors), Vignettes in Gravitation and Cosmology (World Scientific, Singapore, 2012).

Popular articles

  1. L. Sriramkumar, Ripples in spacetime - A new window to the universe, The Fifth Estate, August 22, 2016.
  2. L. Sriramkumar and T. Souradeep, A glimpse of the early universe through BICEP2, The Hindu Online, April 1, 2014.