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Now showing items 1-20 of 1152

10Be depositional flux variation in the central Indian Ocean during the last 43 ka

Jena, Partha Sarathi; Bhushan, Ravi; Ajay, Shivam; Bharti, Nisha; Sudheer, A. K. (Elsevier, 2022-01)

The advent of Accelerator Mass Spectrometer (AMS) enhanced the application of meteoric 10Be (half-life of 1.39 Ma) as a tracer for understanding earth surface processes on thousand to million-year time scales. However, for ...
10Be exposure age dating of moraine boulders and glacially polished bedrock surfaces in Karakoram and Ladakh ranges, NW Himalaya: implications in quaternary glaciation studies

Jena, Partha Sarathi; Bhushan, Ravi; Sharma, Shubhra; Dabhi, Ankur J.; Ajay, Shivam; Raj, Harsh; Juyal, Navin (Wiley, 2023-11)

Terrestrial cosmogenic nuclide (TCN) dating has emerged as one of the most useful techniques in the last two decades for quantifying geomorphological processes and building the chronology of late Quaternary glacial ...
The 2HDM doppelganger

Coleppa, Baradhwaj; Sarkar, Agnivo (SpringerOpen, 2022-06)

We discuss the structure of a model with anextended gauge symmetry groupSU(2)×SU(2)×U(1)with a correspondingly rich Electroweak Symmetry Break-ing structure. In spite of the additional scalar degrees of free-dom ...
331 models and grand unification: From minimal SU(5) to minimal SU(6)

Hati, Chandan; Deppisch, Frank F.; Patra, Sudhanwa; Sarkar, Utpal; Valle, Jose W. F. (Elsevier, 2016-11)

We consider the possibility of grand unification of the SU(3)c⊗SU(3)L⊗U(1)X model in an SU(6) gauge unification group. Two possibilities arise. Unlike other conventional grand unified theories, in SU(6) one can embed the ...
3D N = 1 supergravity from Virasoro TQFT: gravitational partition function and out-of-time-order correlator

Bhattacharyya, Arpan; Ghosh, Saptaswa; Nandi, Poulami; Pal, Sounak (Springer, 2025-02)

In this paper, we compute the partition functions of N = 1 SUGRA for different boundary topologies, i.e. punctured sphere and torus, using super-Virasoro TQFT. We use fusion and modular kernels of the super-Liouville theory ...
750 GeV resonance in the dark left-right model

Dey, Ujjal Kumar; Mohanty, Subhendra; Tomar, Gaurav (Elsevier, 2016-05)

We explain the 750 GeV750 GeV diphoton resonance in the context of the dark left-right symmetric model. A global symmetry in this model, stabilizes the dark matter and ensures that the scalar couples dominantly to gluons ...
A case of anomalous electric field perturbations in the equatorial ionosphere during postsunset hours: insights

Kumar, Ankit; Chakrabarty, Dibyendu; Fejer, B. G.; Reeves, Geoffrey D.; Rout, Diptiranjan; Sripathi, S.; Seemala, Gopi K.; Sunda, Surendra; Yadav, Anil Kumar (Wiley, 2023-02)

During a weak geomagnetic storm (Ap = 15) on 24 December 2014, the penetration electric field perturbations over the Indian dip equatorial sector are found to be anomalous on a number of occasions during postsunset hours. ...
A joint fermi-GBM and swift-BAT analysis of gravitational-wave candidates from the third gravitational-wave observing run

Roy, Soumen; Sengupta, Anand S. (IOP Publishing, 2024-04)

We present Fermi Gamma-ray Burst Monitor (Fermi-GBM) and Swift Burst Alert Telescope (Swift-BAT) searches for gamma-ray/X-ray counterparts to gravitational-wave (GW) candidate events identified during the third observing ...
A long-term study of Mrk 50: appearance and disappearance of soft excess

Layek, Narendranath; Nandi, Prantik; Naik, Sachindra; Jana, Arghajit (IOP Publishing, 2025-03)

We present an extensive temporal and spectral study of the Seyfert 1 AGN Mrk 50 using 15 yr (2007–2022) of multiwavelength observations from XMM-Newton, Swift, and NuSTAR for the first time. From the timing analysis, we ...
A new graphitization setup for radiocarbon dating using accelerator mass spectrometer at Physical Research Laboratory Ahmedabad

Laskar, Amzad Hussain; Nayak, Pratheeksha; Singh, Aishwarya; Agrawal, Rahul Kumar; Mohanty, Ranjan Kumar; Shah, Manan S.; Yadava, M. G. (Elsevier, 2025-06)

A new vacuum system for radiocarbon (14C) dating has been developed at the Physical Research Laboratory (PRL), Ahmedabad. This system uses zinc as a reducing agent and iron powder as a catalyst to convert CO2 into graphite, ...
A new Monte Carlo generator for BSM physics in B ? K*?+?? decays with an application to lepton non-universality in angular distributions

Sibidanov, Alexei; Browder, Thomas E.; Dubey, Shawn; Kohani, Shahab; Mandal, Rusa; Sandilya, Saurabh; Sinha, Rahul; Vahsen, Sven E. (Springer, 2024-08)

Within the widely used EvtGen framework, we have added a new event generator model for B → K*ℓ+ℓ− with improved standard model (SM) decay amplitudes and possible BSM physics contributions, which are implemented in the ...
A novel optical design for wide-field imaging in X-ray astronomy

Tiwari, Neeraj Kumar; Vadawale, Santosh V.; Mithun, N. P. S. (Springer, 2025-04)

Over the decades, astronomical X-ray telescopes have utilized the Wolter type-1 optical design, which provides stigmatic imaging in axial direction but suffers from coma and higher-order aberrations for off-axis sources. ...
A review on air-sea exchange of reactive trace gases over the northern Indian ocean

Gupta, Mansi; Tripathi, Nidhi; Malik, T. G.; Sahu, L. K. (Indian Academy of Sciences, 2024-06)

In the Earth’s atmosphere, greenhouse gases (GHGs) and reactive trace gases are essential components of chemistry–climate interactions. These trace gases are emitted from both natural and anthropogenic sources over terrestrial ...
A review on analytical studies in gravitational lensing

Chowdhuri, Abhishek; Ghosh, Saptaswa; Bhattacharyya, Arpan (Frontiers Media, 2023-03)

In this study, we review some current studies on gravitational lensing for black holes, mainly in the context of general relativity. We mainly focus on the analytical studies related to lensing with references to observational ...
A search using GEO600 for gravitational waves coincident with fast radio bursts from SGR 1935+2154

Sengupta, Anand S. (IOP Publishing, 2024-12)

The magnetar SGR 1935+2154 is the only known Galactic source of fast radio bursts (FRBs). FRBs from SGR 1935+2154 were first detected by the Canadian Hydrogen Intensity Mapping Experiment (CHIME)/FRB and the Survey for ...
A study of the propagation of magnetoacoustic waves in small-scale magnetic fields using solar photospheric and chromospheric dopplergrams: HMI/SDO and MAST observations

Kumar, Hirdesh; Kumar, Brajesh; Rajaguru, S. P.; Mathew, Shibu K.; Bayanna, Ankala Raja (Elsevier, 2023-06)

In this work, we present a study of the propagation of low-frequency magneto-acoustic waves into the solar chromosphere within small-scale inclined magnetic fields over a quiet-magnetic network region utilizing near-simultaneous ...
A swarm of WASP planets: nine giant planets identified by the WASP survey

Baliwal, Sanjay et al. (IOP Publishing, 2025-06)

The Wide Angle Search for Planets (WASP) survey provided some of the first transiting hot Jupiter candidates. With the addition of the Transiting Exoplanet Survey Satellite (TESS), many WASP planet candidates have now been ...
A systematic validation of hot Neptunes in TESS data

Dobal, Richa et al. (Oxford University Press, 2023-02)

We statistically validated a sample of hot Neptune candidates applying a two-step vetting technique using DAVE and TRICERATOPS. We performed a systematic validation of 250 transit-like events in the Transiting Exoplanet ...
A theory of gravity in Minkowski space

Kumar, Naman (Springer, 2025-03)

We propose a theory of gravity in Minkowski space. The basic idea is that the presence of mass affects the world line of particles in flat Minkowski background. Although General Relativity is in complete agreement with ...
Absence of an effective horizon for black holes in gravity's rainbow

Ali, Ahmed Farag; Faizal, Mir; Majumder, Barun (IOP Science, 2015-01)

We argue that the divergence in time for an asymptotic observer occurs because of specifying the position of the Horizon beyond the Planck scale. In fact, a similar divergence in time will also occur for an in-going observer ...

Now showing items 1-20 of 1152

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