M. A. Krishnakumar

Combining the second data release of the European Pulsar Timing Array with low-frequency pulsar data

F. Iraci, A. Chalumeau, C. Tiburzi, J. P. W. Verbiest et autres

Context. Low radio frequency data are highly valuable for enhancing the sensitivity of pulsar timing arrays (PTAs) to propagation effects, such as dispersion measure (DM) variations. These low-frequency observations are particularly sensitive to DM fluctuations and can therefore significantly improve noise characterization …

it, nl, us, ie, de, gr, in, fr, cn, ca, jp, ua, sk, Afrique du Sud (code pays fourni par la source)

Searches for signatures of ultralight axion dark matter in polarimetry data of the European Pulsar Timing Array

N. K. Porayko, P. Usynina, Jorge Terol-Calvo, Jorge Martin Camalich et autres

Ultralight axionlike particles (ALPs) can be a viable solution to the dark matter problem. The scalar field associated with ALPs, coupled to the electromagnetic field acts as an active birefringent medium, altering the polarization properties of light through which it propagates. In …

de, it, es, co, fr, gb, pt, nl, cn, ie, pr (code pays fourni par la source)

Design of 4-Bit Multiplier Using Modified Gate Diffusion Input Technology for Low Power Applications

B. Manjurathi, M. A. Krishnakumar, Manoj Kumar K

Multipliers are widely used in digital circuits for countless arithmetic operations and are critical components in many very large scale integration systems. The multiplication process is one of the basic processes in digital equipment, and hardware multipliers play a key role in …

The Indian Pulsar Timing Array data release 2: I. Dataset and timing analysis

Prerna Rana, Pratik Tarafdar, K. Nobleson, C. Dwivedi et autres

Abstract The Indian Pulsar Timing Array (InPTA) employs unique features of the upgraded Giant Metrewave Radio Telescope (uGMRT) to monitor dozens of the International Pulsar Timing Array (IPTA) millisecond pulsars (MSPs), simultaneously in the 300–500 MHz and the 1260–1460 MHz bands. This …

in, Afrique du Sud, jp, ro, de, us, au (code pays fourni par la source)

Upgrades to the VLBI capabilities of the upgraded GMRT

Visweshwar Ram Marthi, Suda Harshavardhan Reddy, Sanjay Kudale, Sandeep Choudhari et autres

in (code pays fourni par la source)

Pulsar timing methods for evaluating dispersion measure time series

F. Iraci, A. Chalumeau, C. Tiburzi, J. P. W. Verbiest et autres

Context . Radio pulsars can be used for many studies, including the investigation of the ionized interstellar medium and the solar wind via their dispersive effects. These phenomena affect the high-precision timing of pulsars and are among the main sources of noise …

fr (code pays fourni par la source)

Pulsar timing methods for evaluating dispersion measure time series

F. Iraci, A. Chalumeau, C. Tiburzi, J. P. W. Verbiest et autres

Radio pulsars allow the study of the ionised interstellar medium and its dispersive effects, a major noise source in gravitational wave searches using pulsars. In this paper, we compare the functionality and reliability of three commonly used schemes to measure temporal variations …

fr (code pays fourni par la source)

Improving DM estimates using low-frequency scatter-broadening estimates

Jaikhomba Singha, B. C. Joshi, M. A. Krishnakumar, F. Kareem et autres

ABSTRACT A pulsar’s pulse profile gets broadened at low frequencies due to dispersion along the line of sight or due to multipath propagation. The dynamic nature of the interstellar medium makes both of these effects time-dependent and introduces slowly varying time delays …

in, Afrique du Sud, de, jp, au, us (code pays fourni par la source)

Exploring the time variability of the solar wind using LOFAR pulsar data

S. C. Susarla, A. Chalumeau, C. Tiburzi, E. F. Keane et autres

Context. High-precision pulsar timing is highly dependent on the precise and accurate modelling of any effects that can potentially impact the data. In particular, effects that contain stochastic elements contribute to some level of corruption and complexity in the analysis of pulsar-timing …

ie, it, us, in, de, fr, gb, au, Afrique du Sud (code pays fourni par la source)

The second data release from the European Pulsar Timing Array

John Antoniadis, P. Arumugam, S. Arumugam, S. Babak et autres

We present the results of a search for continuous gravitational wave signals (CGWs) in the second data release (DR2) of the European Pulsar Timing Array (EPTA) Collaboration. The most significant candidate event from this search has a gravitational wave frequency of 4–5 …

Comparing Recent Pulsar Timing Array Results on the Nanohertz Stochastic Gravitational-wave Background

Gabriella Agazie, John Antoniadis, Akash Anumarlapudi, Anne M. Archibald et autres

Abstract The Australian, Chinese, European, Indian, and North American pulsar timing array (PTA) collaborations recently reported, at varying levels, evidence for the presence of a nanohertz gravitational-wave background (GWB). Given that each PTA made different choices in modeling their data, we perform …

us, de, gr, gb, in, au, fr, nl, it, cn, ca, pl, jp (code pays fourni par la source)

The second data release from the European Pulsar Timing Array

John Antoniadis, P. Arumugam, S. Arumugam, S. Babak et autres

The European Pulsar Timing Array (EPTA) and Indian Pulsar Timing Array (InPTA) collaborations have measured a low-frequency common signal in the combination of their second and first data releases, respectively, with the correlation properties of a gravitational wave background (GWB). Such a …

fr, in, gb, de, it, jp, nl, ie (code pays fourni par la source)