Magnetization and Spin State Crossover in the Multiferroic Ca$_3$Co$_{2-x}$Mn$_x$O$_6$ (2009)
Flint, R., Chandra, P., Kiryukhin, V.
Ca$_3$Co$_{2-x}$Mn$_x$O$_6$ (x ~ 0.96) is a multiferroic with spin-chains of alternating Co$^{2+}$ and Mn$^{4+}$ ions. The spin state of Co$^{2+}$ remains unresolved, as there is a discrepancy...
Discovery of a Relativistic Supernova Without a Gamma-ray Trigger (2009)
Soderberg, A. M., Chakraborti, S., Pignata, G., Chevalier, R. A., Chandra, P., Ray, A., ...
Type Ibc supernovae (SNe Ibc) mark the gravitational collapse of some massive stars (M > 20 Msun) propelling several solar masses of material to typical velocities of ~10,000 km/s. The...
The High-Metallicity Explosion Environment of the Relativistic Supernova 2009bb (2009)
Levesque, E. M., Soderberg, A. M., Foley, R. J., Berger, E., Kewley, L. J., Chakraborti, S., ...
We investigate the environment of the nearby (d ~ 40Mpc) broad-lined Type Ic supernova SN 2009bb. This event was observed to produce a relativistic outflow likely powered by a central accreting...
The Casimir Effect from a Condensed Matter Perspective (2009)
Palova, L., Chandra, P., Coleman, P.
The Casimir effect, a key observable realization of vacuum fluctuations, is usually taught in graduate courses on quantum field theory. The growing importance of Casimir forces in...
Magnetostructural Effect in the Multiferroic BiFeO3-BiMnO3 Checkerboard from First Principles (2009)
Palova, L., Chandra, P., Rabe, K. M.
Using first principles calculations, we present a magnetostructural effect in the BiFeO3-BiMnO3 nanocheckerboard that is not found in either bulk parent compound or in BiFeO3-BiMnO3 superlattices. We...
Search for TeV $\gamma$ -rays from H1426+428 during 2004-07 with the TACTIC telescope (2009)
Yadav, K. K., Rannot, R. C., Chandra, P., Tickoo, A. K., Thoudam, S., Venugopal, K., ...
The BL Lac object H1426+428 ($z\equiv 0.129$) is an established source of TeV $\gamma$-rays and detections of these photons from this object also have important implications for estimating the...
The Collimation and Energetics of the Brightest Swift Gamma-Ray Bursts (2009)
Cenko, S. B., Frail, D. A., Harrison, F. A., Kulkarni, S. R., Nakar, E., Chandra, P., ...
Long-duration gamma-ray bursts (GRBs) are widely believed to be highly-collimated explosions (opening angle theta ~ 1-10 deg). As a result of this beaming factor, the true energy release from a GRB...
Dhar, V. K., Tickoo, A. K., Koul, M. K., Rannot, R. C., Yadav, K. K., Chandra, P., ...
The energy estimation procedures employed by different groups, for determining the energy of the primary $\gamma$-ray using a single atmospheric Cherenkov imaging telescope, include methods like...
Comparison of sub-Tenon's block with i.v. fentanyl for paediatric vitreoretinal surgery (2009)
Chhabra, A., Sinha, R., Subramaniam, R., Chandra, P., Narang, D., Garg, S. P.
Background Vitreoretinal (VR) surgery is associated with moderate to severe pain and significant postoperative nausea and vomiting (PONV). The study aimed to assess the effectiveness of sub-Tenon's...
Perley, D. A., Li, W., Chornock, R., Prochaska, J. X., Butler, N. R., Chandra, P., ...
The optical afterglow of long-duration GRB 071003 is among the brightest yet to be detected from any GRB, with R ≈ 12 mag in KAIT observations starting 42 s after the GRB trigger, including...
GRB 070201: A possible soft gamma-ray repeater in M31 (2008)
Ofek, E. O., Muno, M., Quimby, R., Kulkarni, S. R., Stiele, H., Pietsch, W., ...
GRB 070201 was a bright, short-duration, hard-spectrum gamma-ray burst detected by the Interplanetary Network. Its error quadrilateral, which has an area of 0.124 deg^2, intersects some prominent...
Perley, D. A., Li, W., Chornock, R., Prochaska, J. X., Butler, N. R., Chandra, P., ...
The optical afterglow of long-duration GRB 071003 is among the brightest yet to be detected from any GRB, with R ~ 12 mag in KAIT observations starting 42 s after the GRB trigger, including filtered...
GRB 070610: a curious galactic transient (2008)
Kasliwal, M. M., Cenko, S. B., Kulkarni, S. R., Cameron, P. B., Nakar, E., Ofek, E. O., ...
GRB 070610 is a typical high-energy event with a duration of 5 s. Yet within the burst localization we detect a highly unusual X-ray and optical transient, Swift J195509.6+261406. We see...
Quantum Critical Paraelectrics and the Casimir Effect in Time (2008)
Palova, L., Chandra, P., Coleman, P.
We study the quantum paraelectric-ferroelectric transition near a quantum critical point, emphasizing the role of temperature as a "finite size effect" in time. The influence of temperature near...
An extremely luminous X-ray outburst at the birth of a supernova (2008)
Soderberg, A. M., Berger, E., Page, K. L., Schady, P., Parrent, J., Pooley, D., ...
GRB 070610: a curious galactic transient (2008)
Kasliwal, M. M., Cenko, S. B., Kulkarni, S. R., Cameron, P. B., Nakar, E., Ofek, E. O., ...
GRB 070201: a possible soft gamma-ray repeater in M31 (2008)
Ofek, E. O., Muno, M., Quimby, R., Kulkarni, S. R., Stiele, H., Pietsch, W., ...
Markoff, S., Nowak, M., Young, A., Marshall, H.L., Canizares, C.R., Peck, A., ...
We present the results of a broadband simultaneous campaign on the nearby low-luminosity active galactic nucleus M81*. From 2005 February through August, we observed M81* five times using the Chandra...
An extremely luminous X-ray outburst at the birth of a supernova (2008)
Soderberg, A.M., Berger, E., Page, K.L., Schady, P., Parrent, J., Pooley, D., ...
Massive stars end their short lives in spectacular explosions—supernovae—that synthesize new elements and drive galaxy evolution. Historically, supernovae were discovered mainly through their...
Distribution of Attraction Basins in a Family of Simple Glasses (2007)
Chandra And Ioffe, P. Chandra, L. B. Ioffe
We study the distribution of attraction basins as a function of energy in simple glasses. We find that it is always broad. Furthermore we identify two types of glasses, both with an exponentially...
The TACTIC atmospheric Cherenkov Imaging telescope (2007)
Koul, R., Tickoo, A. K., Kaul, S. K., Kaul, S. R., Kumar, N., Yadav, K. K., ...
The TACTIC $\gamma$-ray telescope, equipped with a light collector of area $\sim$9.5m$^2$ and a medium resolution imaging camera of 349-pixels, has been in operation at Mt.Abu, India since 2001. This...
Yadav, K. K., Chandra, P., Tickoo, A. K., Rannot, R. C., Godambe, S., Koul, M. K., ...
The TACTIC $\gamma$-ray telescope has observed Mrk 421 on 66 clear nights from Dec. 07, 2005 to Apr. 30, 2006, totalling $\sim$ 202 hours of on-source observations. Here, we report the detection of...
Detection of a radio counterpart to the 27 December 2004 giant flare from SGR 1806-20 (2005)
Cameron, PB, Chandra, P, Ray, A, Kulkarni, SR, Frail, DA, Wieringa, MH, ...
It was established over a decade ago that the remarkable high-energy transients known as soft $\gamma$-ray repeaters (SGRs) are located in our Galaxy and originate from neutron stars with intense...
Detection of a radio counterpart to the 27 December 2004 giant flare from SGR 1806-20 (2005)
Cameron, P. B., Chandra, P., Ray, A., Kulkarni, S. R., Frail, D. A., Wieringa, M. H., ...
Detection of a radio counterpart to the 27 December 2004 giant flare from SGR 1806-20 (2005)
Cameron, PB, Chandra, P, Ray, A, Kulkarni, SR, Frail, DA, Wieringa, MH, ...
It was established over a decade ago that the remarkable high-energy transients known as soft $\gamma$-ray repeaters (SGRs) are located in our Galaxy and originate from neutron stars with intense...
The Late-Time Radio Emission from SN 1993J at Meter Wavelengths (2004)
Chandra, P, Ray, A, Bhatnagar, S
This paper presents the investigations of SN 1993J using low-frequency observations with the Giant Metrewave Radio Telescope (GMRT). We analyze the light curves of SN 1993J at 1420, 610, 325, and 243...
X-ray and radio prompt emission from a hypernova SN 2002ap (2004)
Chandra, P, Ray, A, Sutaria, F
Here we report on combined X-ray and radio observations of SN 2002ap with XMM-Newton ToO observation and GMRT observations aided with VLA published results. In deriving the X-ray flux of SN 2002ap we...
The Late-Time Radio Emission from SN 1993J at Meter Wavelengths (2004)
Chandra, P, Ray, A, Bhatnagar, S
This paper presents the investigations of SN 1993J using low-frequency observations with the Giant Metrewave Radio Telescope (GMRT). We analyze the light curves of SN 1993J at 1420, 610, 325, and 243...
X-ray and radio prompt emission from a hypernova SN 2002ap (2004)
Chandra, P, Ray, A, Sutaria, F
Here we report on combined X-ray and radio observations of SN 2002ap with XMM-Newton ToO observation and GMRT observations aided with VLA published results. In deriving the X-ray flux of SN 2002ap we...
Low frequency radio and X-ray properties of core-collapse supernovae (2003)
Ray, A, Chandra, P, Sutaria, F, Bhatnagar, S
Radio and X-ray studies of young supernovae probe the interaction between the supernova shock waves and the surrounding medium and give clues to the nature and past of the progenitor star. Here we...
Low frequency observations of SN 1993J with Giant Meterwave Radio Telescope (2003)
Chandra, P, Ray, A, Bhatnagar, S
In this paper, we discuss the low frequency spectrum of SN 1993J with GMRT. We observed SN 1993J at several epochs in 20cm, 50cm, 90cm and 125cm wavelengths and achieved near simultaneous spectra. We...
The nature of the prompt X-ray and radio emission from SN2002ap (2002)
Sutaria, FK, Chandra, P, Bhatnagar, S, Ray, A
We report on the combined X-ray and radio observations of the type Ic SN 2002ap, using XMM-Newton ToO observation of M74 and the Giant Metrewave Radio Telescope (GMRT). We account for the presence of...
The anisotropic kagome antiferromagnet: a topological spin glass? (1993)
Chandra, P., Coleman, P., Ritchey, I.
The anisotropic kagomé antiferromagnet is discussed as a possible candidate for glassiness in the absence of disorder. Numerical studies support the conjecture that this system is not a conventional...
The anisotropic kagome antiferromagnet: a topological spin glass? (1993)
Chandra, P., Coleman, P., Ritchey, I.
The anisotropic kagomé antiferromagnet is discussed as a possible candidate for glassiness in the absence of disorder. Numerical studies support the conjecture that this system is not a conventional...
Following pneumonectomy in the prone position a boy of 10 developed swelling of the right side of the face which was accompanied by facial paralysis. Pressure trauma during operation is thought to...
Twelve cases are described in which, without using the blind nasal technique, intubation would have been impossible or very difficult. The technique employed is described in detail, and a plea is...
THE EFFECT ON THE EYE OF PREMEDICATION WITH ATROPINE (1965)
MEHRA, KRISHNA SWAMI, CHANDRA, P.
Atropine 0.1 mg/stone (0.016 mg/kg) was administered intramuscularly to 100 patients without ophthalmic disease. Mydriasis was noted in only thirteen patients and rise of intraocular tension in nine....