Items where Author is "Sahni, Varun"

Article

Bag, Satadru ; Mondal, Rajesh ; Sarkar, Prakash ; Bharadwaj, Somnath ; Choudhury, Tirthankar Roy ; Sahni, Varun (2019) Studying the morphology of H iisodensity surfaces during reionization using Shapefinders and percolation analysis Monthly Notices of the Royal Astronomical Society, 485 (2). pp. 2235-2251. ISSN 0035-8711

Bag, Satadru ; Mondal, Rajesh ; Sarkar, Prakash ; Bharadwaj, Somnath ; Sahni, Varun (2018) The shape and size distribution of H ii regions near the percolation transition Monthly Notices of the Royal Astronomical Society, 477 (2). pp. 1984-1992. ISSN 0035-8711

Arabsalmani, Maryam ; Sahni, Varun (2011) Statefinder hierarchy: An extended null diagnostic for concordance cosmology Physical Review D - Particles, Fields, Gravitation and Cosmology, 83 (4). pp. 043501_1-043501_5. ISSN 1550-7998

Shtanov, Yuri ; Sahni, Varun (2010) Generalizing the cosmic energy equation Physical Review D - Particles, Fields, Gravitation and Cosmology, 82 (10). pp. 101503_1-101503_5. ISSN 1550-7998

Saini, Tarun Deep ; Sethi, Shiv K. ; Sahni, Varun (2010) Possible use of self-calibration to reduce systematic uncertainties in determining distance-redshift relation via gravitational radiation from merging binaries Physical Review D - Particles, Fields, Gravitation and Cosmology, 81 (10). pp. 103009_1-103009_6. ISSN 1550-7998

Joy, Minu ; Shafieloo, Arman ; Sahni, Varun ; Starobinsky, Alexei A. (2009) Is a step in the primordial spectral index favoured by CMB data? Journal of Cosmology and Astroparticle Physics, 2009 . pp. 028_1-028_8. ISSN 1475-7516

Shtanov, Yuri ; Sahni, Varun ; Shafieloo, Arman ; Toporensky, Alexey (2009) Induced cosmological constant and other features of asymmetric brane embedding Journal of Cosmology and Astroparticle Physics, 2009 . pp. 023_1-023_16. ISSN 1475-7516

Shafieloo, Arman ; Sahni, Varun ; Starobinsky, Alexei A. (2009) Is cosmic acceleration slowing down? Physical Review D - Particles, Fields, Gravitation and Cosmology, 80 (10). pp. 101301_1-101301_5. ISSN 1550-7998

Alam, Ujjaini ; Sahni, Varun ; Starobinsky, Alexei A. (2009) Reconstructing cosmological matter perturbations using standard candles and rulers The Astrophysical Journal, 704 (2). pp. 1086-1097. ISSN 0004-637X

Sahni, Varun ; Shtanov, Yuri (2008) APSIS: An artificial planetary system in space to probe extra-dimensional gravity and MOND International Journal of Modern Physics D, 17 (3-4). pp. 453-466. ISSN 0218-2718

Joy, Minu ; Sahni, Varun ; Starobinsky, Alexei A. (2008) New universal local feature in the inflationary perturbation spectrum Physical Review D - Particles, Fields, Gravitation and Cosmology, 77 (2). pp. 023514_1-023514_10. ISSN 1550-7998

Sahni, Varun (2008) Reconstructing the properties of dark energy Progress of Theoretical Physics, 172 . pp. 110-120. ISSN 0033-068X

Sahni, Varun ; Shafieloo, Arman ; Starobinsky, Alexei A. (2008) Two new diagnostics of dark energy Physical Review D - Particles, Fields, Gravitation and Cosmology, 78 (10). pp. 103502_1-103502_11. ISSN 1550-7998

Shtanov, Yuri ; Viznyuk, Alexander ; Sahni, Varun (2007) Gravitational instability on the brane: The role of boundary conditions Classical and Quantum Gravity, 24 (24). pp. 6159-6189. ISSN 0264-9381

Alam, Ujjaini ; Sahni, Varun ; Starobinsky, Alexei A. (2007) Exploring the properties of dark energy using type-Ia supernovae and other datasets Journal of Cosmology and Astroparticle Physics, 2007 . No pp. given. ISSN 1475-7516

Maeda, Hideki ; Sahni, Varun ; Shtanov, Yuri (2007) Braneworld dynamics in Einstein-Gauss-Bonnet gravity Physical Review D - Particles, Fields, Gravitation and Cosmology, 76 (10). pp. 104028_1-104028_11. ISSN 1550-7998

Shafieloo, Arman ; Alam, Ujjaini ; Sahni, Varun ; Starobinsky, Alexei A. (2006) Smoothing supernova data to reconstruct the expansion history of the Universe and its age Monthly Notices of the Royal Astronomical Society, 366 (3). pp. 1081-1095. ISSN 0035-8711

Alam, Ujjaini ; Sahni, Varun (2006) Confronting braneworld cosmology with supernova data and baryon oscillations Physical Review D - Particles, Fields, Gravitation and Cosmology, 73 (8). pp. 084024_1-084024_10. ISSN 1550-7998

Tretyakov, Petr ; Toporensky, Aleksey ; Shtanov, Yuri ; Sahni, Varun (2006) Quantum effects, soft singularities and the fate of the Universe in a Braneworld cosmology Classical and Quantum Gravity, 23 (10). pp. 3259-3274. ISSN 0264-9381

Sahni, Varun ; Starobinsky, Alexi (2006) Reconstructing dark energy International Journal of Modern Physics D, 15 (12). pp. 2105-2132. ISSN 0218-2718

Sahni, Varun ; Shtanov, Yuri ; Viznyuk, Alexander (2005) Cosmic mimicry: is LCDM a Braneworld in disguise? Journal of Cosmology and Astroparticle Physics, 2005 . pp. 005_1-005_22. ISSN 1475-7516

Sheth, Jatush V. ; Sahni, Varun (2005) Exploring the geometry, topology and morphology of large scale structure using Minkowski functionals Current Science, 88 (7). pp. 1101-1116. ISSN 0011-3891

Sahni, Varun ; Shtanov, Yuri (2005) Did the universe loiter at high redshifts? Physical Review D - Particles, Fields, Gravitation and Cosmology, 71 (8). pp. 084018_1-084018_11. ISSN 1550-7998

Alam, Ujjaini ; Sahni, Varun ; Saini, Tarun Deep ; Starobinsky, A. A. (2004) Is there supernova evidence for dark energy metamorphosis? Monthly Notices of the Royal Astronomical Society, 354 (1). pp. 275-291. ISSN 0035-8711

Shandarin, Sergei F. ; Sheth, Jatush V. ; Sahni, Varun (2004) Morphology of the supercluster-void network in ΛCDM cosmology Monthly Notices of the Royal Astronomical Society, 353 (1). pp. 162-178. ISSN 0035-8711

Alam, Ujjaini ; Sahni, Varun ; Starobinsky, A. A. (2004) The case for dynamical dark energy revisited Journal of Cosmology and Astroparticle Physics, 2004 . pp. 008 _1-008_16. ISSN 1475-7516

Alam, Ujjaini ; Sahni, Varun ; Saini, Tarun Deep ; Starobinsky, A. A. (2003) Exploring the expanding Universe and dark energy using the Statefinder diagnostic Monthly Notices of the Royal Astronomical Society, 344 (4). pp. 1057-1074. ISSN 0035-8711

Sheth, Jatush V. ; Sahni, Varun ; Shandarin, Sergei F. ; Sathyaprakash, B. S. (2003) Measuring the geometry and topology of large-scale structure using SURFGEN: methodology and preliminary results Monthly Notices of the Royal Astronomical Society, 343 (1). pp. 22-46. ISSN 0035-8711

Sahni, Varun (2003) Theoretical models of dark energy Chaos, Solitons & Fractals, 16 (4). pp. 527-537. ISSN 0960-0779

Alam, Ujjaini ; Sahni, Varun ; Starobinsky, Alexei A. (2003) Can dark energy be decaying? Journal of Cosmology and Astroparticle Physics, 2003 . pp. 002_1-002_13. ISSN 1475-7516

Shtanov, Yuri ; Sahni, Varun (2003) Bouncing Braneworlds Physics Letters B, 557 (1-2). pp. 1-6. ISSN 0370-2693

Sahni, Varun ; Shtanov, Yuri (2003) Braneworld models of dark energy Journal of Cosmology and Astroparticle Physics, 2003 . pp. 014_1-014_38. ISSN 1475-7516

Shtanov, Yuri ; Sahni, Varun (2002) New cosmological singularities in Braneworld models Classical and Quantum Gravity, 19 (11). pp. L101-L107. ISSN 0264-9381

Sahni, Varun ; Shtanov, Yuri (2002) New vistas in Braneworld cosmology International Journal of Modern Physics D, 11 (10). pp. 1515-1521. ISSN 0218-2718

Sahni, Varun (2002) The cosmological constant problem and quintessence Classical and Quantum Gravity, 19 (13). p. 3435. ISSN 0264-9381

Maartens, Roy ; Sahni, Varun ; Saini, Tarun Deep (2001) Anisotropy dissipation in brane-world inflation Physical Review D - Particles, Fields, Gravitation and Cosmology, 63 (6). pp. 063509_1-063509_6. ISSN 1550-7998

Kanekar, Nissim ; Sahni, Varun ; Shtanov, Yuri (2001) Recycling the universe using scalar fields Physical Review D, 63 (8). ISSN 0556-2821

Kanekar, Nissim ; Sahni, Varun ; Shtanov , Yuri (2001) Recycling the universe using scalar fields Physical Review D - Particles, Fields, Gravitation and Cosmology, 63 (8). pp. 083520_1-083520_8. ISSN 1550-7998

Sahni, Varun ; Sami, M. ; Souradeep , Tarun (2001) Relic gravity waves from braneworld inflation Physical Review D - Particles, Fields, Gravitation and Cosmology, 65 (2). pp. 023518_1-023518_16. ISSN 1550-7998

Sahni, Varun (2000) The case for the cosmological constant Pramana - Journal of Physics, 55 (1-2). pp. 43-52. ISSN 0304-4289

Bharadwaj, Somnath ; Sahni, Varun ; Sathyaprakash, B. S. ; Shandarin, Sergei F. ; Yess, Capp (2000) Evidence for filamentarity in the Las Campanas redshift survey The Astrophysical Journal, 528 (1). pp. 21-29. ISSN 0004-637X

Sahni, Varun ; Wang , Limin (2000) New cosmological model of quintessence and dark matter Physical Review D - Particles, Fields, Gravitation and Cosmology, 62 (10). pp. 103517_1-103517_4. ISSN 1550-7998

Saini, Tarun Deep ; Raychaudhury, Somak ; Sahni, Varun ; Starobinsky, A. A. (2000) Reconstructing the cosmic equation of state from supernova distances Physical Review Letters, 85 (6). pp. 1162-1165. ISSN 0031-9007

Sahni, Varun ; Starobinsky, Alexei (2000) The case for a positive cosmological Λ-term International Journal of Modern Physics D, 9 (4). pp. 373-443. ISSN 0218-2718

Sahni, Varun (1999) Pancakes and filaments in cosmological gravitational clustering Pramana - Journal of Physics, 53 (6). pp. 995-1000. ISSN 0304-4289

Sahni, Varun (1999) The cosmological constant revisited Pramana - Journal of Physics, 53 (6). pp. 937-944. ISSN 0304-4289

Schmalzing, Jens ; Buchert, Thomas ; Melott, Adrian L. ; Sahni, Varun ; Sathyaprakash, B. S. ; Shandarin, Sergei F. (1999) Disentangling the cosmic web. I. Morphology of isodensity contours The Astrophysical Journal, 526 (2). pp. 568-578. ISSN 0004-637X

Sahni, Varun (1999) Generating Λ from the vaccum Modern Physics Letters A, 14 (33). pp. 2269-2275. ISSN 0217-7323

Mohanty, Subhendra ; Sahni, Varun ; Chakraborty, S. ; Goyal, Ashok ; Dutta, Sukanta ; Choudhury, Debajyoti ; Mahajan, Shobhit ; Mukherjee, Amitabha ; Widyan, Hatem ; Yajnik, Urjit ; Mohanty, S. ; Grifols, J. A. ; Mahanta, Uma ; Sahu, Sarira ; Sahni, Varun ; Souradeep, Tarun ; Stebbins, Albert ; Waga, Ioav ; Soni, Vikram ; Panchapakesan, N. ; Brandenberger, R. (1998) Astroparticle physics: working group report Pramana - Journal of Physics, 51 (1&2). pp. 273-286. ISSN 0304-4289

Sahni, Varun (1998) The inflationary Universe - from theory to observations Pramana - Journal of Physics, 51 (1-2). pp. 27-37. ISSN 0304-4289

Sahni, Varun ; Habib, Salman (1998) Does inflationary particle production suggest Ω_m <1? Physical Review Letters, 81 (8). pp. 1766-1769. ISSN 0031-9007

Sathyaprakash, B. S. ; Sahni, Varun ; Shandarin, Sergei ; Fisher, Karl B. (1998) Filaments and pancakes in the IRAS 1.2 Jy redshift catalog The Astrophysical Journal Letters, 507 (2). pp. L109-L112. ISSN 2041-8205

Sathyaprakash, B. S. ; Sahni, Varun ; Shandarin, Sergei (1998) Morphology of clusters and superclusters in N-body simulations of cosmological gravitational clustering The Astrophysical Journal, 508 (2). pp. 551-569. ISSN 0004-637X

Sahni, Varun (1997) The large scale structure of the Universe: dynamical and statistical aspects Pramana - Journal of Physics, 49 (1). pp. 131-145. ISSN 0304-4289

Sahni, Varun ; Sathyaprakash, B. S. ; Shandarin, Sergei F. (1997) Probing large-scale structure using percolation and genus curves The Astrophysical Journal Letters, 476 (1). pp. L1_1-L1_8. ISSN 2041-8205

Sathyaprakash, B. S. ; Sahni, Varun ; Shandarin, Sergei F. (1996) Emergence of filamentary structure in cosmological gravitational clustering Astrophysical Journal. Letters to the Editor, 462 (1). pp. L5_1-L5_9. ISSN 0571-7248

Sahni, Varun ; Coles, Peter (1995) Approximation methods for non-linear gravitational clustering Physics Reports, 262 (1-2). pp. 1-135. ISSN 0370-1573

Souradeep, Tarun ; Sahni, Varun (1992) Density perturbation, garvity waves and the cosmic microwave background Modern Physics Letters A, 7 (38). pp. 3541-3551. ISSN 0217-7323

Souradeep, Tarun ; Sahni, Varun (1992) Density perturbations, gravity waves and the cosmic microwave background Modern Physics Letters A, 07 (38). pp. 3541-3551. ISSN 0217-7323

Souradeep, Tarun ; Sahni, Varun (1992) Quantum effects near a point mass in (2 + 1)-dimensional gravity Physical Review D - Particles, Fields, Gravitation and Cosmology, 46 (4). pp. 1616-1633. ISSN 1550-7998

Sahni, Varun (1991) The adhesion model: some results in two and three dimensions Annals of the New York Academy of Sciences, 647 . pp. 749-752. ISSN 0077-8923

Sahni, Varun (1991) Gravitational particle production during the formation of global texture Physical Review D - Particles, Fields, Gravitation and Cosmology, 43 (2). pp. R301-R303. ISSN 1550-7998

Sahni, Varun (1990) Energy density of relic gravity waves from inflation Physical Review D - Particles, Fields, Gravitation and Cosmology, 42 (2). pp. 453-463. ISSN 1550-7998

Sahni, Varun (1988) Particle creation by cosmic strings Modern Physics Letters A, 3 (15). pp. 1425-1429. ISSN 0217-7323

Sahni, Varun ; Kofman, L. A. (1986) Some self-consistent solutions of the Einstein equations with one-loop quantum gravitational corrections: G_ik = 8ρG<T_ik>_vac Physics Letters A, 117 (6). pp. 275-278. ISSN 0375-9601

Kofman, L. A. ; Sahni, Varun (1983) A new self-consistent solution of the Einstein equations with one-loop quantum-gravitational corrections Physics Letters B, 127 (3-4). pp. 197-200. ISSN 0370-2693

Sahni, Varun (1980) Massless particles and cosmology Pramana - Journal of Physics, 15 (5). pp. 423-434. ISSN 0304-4289