246 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of DelhiIN41 papers
- Deen Dayal Upadhyay HospitalIN8 papers
- Universidade Federal do Rio Grande do NorteBR8 papers
- Jamia Millia IslamiaIN5 papers
- Universidade Federal de Campina GrandeBR5 papers
- Universidade Federal de SergipeBR5 papers
- Armagh Observatory & PlanetariumGB3 papers
- National ObservatoryBR3 papers
- St. Stephen's CollegeIN3 papers
- St. Stephen’s HospitalIN3 papers
- University of StrathclydeGB3 papers
- University of WashingtonUS3 papers
42 papers
Gamma Rays Bursts: A Viable Cosmological Probe?
Darshan Kumar, Nisha Rani, Deepak Jain +2
In this work, our focus is on exploring the potential of current GRB measurements to provide reliable constraints on cosmological model parameters at high redshift. This work is di…
Revisiting the epoch of cosmic acceleration
David Dahiya, Deepak Jain
We revisit the epoch of cosmic speed-up characterized by the redshift of transition from a decelerated to an accelerated phase. This redshift is termed the transition redshift ($z_…
Constraints on the transition redshift from the calibrated Gamma-ray Burst - correlation
Marco Muccino, Orlando Luongo, Deepak Jain
We constrain the deceleration-acceleration epoch, namely the transition redshift , adopting model-independent techniques that utilize a calibrated -…
Constraints on the Transition Redshift using Hubble Phase Space Portrait
Darshan Kumar, Deepak Jain, Shobhit Mahajan +2
One of the most significant discoveries in modern cosmology is that the universe is currently in a phase of accelerated expansion after a switch from a decelerated expansion. The r…
Testing spatial curvature and anisotropic expansion on top of the CDM model
Ozgur Akarsu, Eleonora Di Valentino, Suresh Kumar +2
We explore the possible advantages of extending the CDM model by more realistic backgrounds compared to its spatially flat RW spacetime assumption, while preserving the underpin…
A non-parametric test of variability of Type Ia supernovae luminosity and CDDR
Darshan Kumar, Akshay Rana, Deepak Jain +3
The first observational evidence for cosmic acceleration appeared from Type Ia supernovae (SNe Type Ia) Hubble diagram from two different groups. However, the empirical treatment o…
Strong lensing systems and galaxy cluster observations as probe to the cosmic distance duality relation
R. F. L. Holanda, F. S. Lima, Akshay Rana +1
{In this paper, we use large scale structure observations to test the redshift dependence of cosmic distance duality relation (CDDR), }, with $D…
-balanced squeezing function
Naveen Gupta, Sanjay Kumar Pant
We introduce the notion of squeezing function corresponding to -balanced domains motivated by the concept of generalized squeezing function given by Rong and Yang. In this work…
Squeezing function corresponding to polydisk
Naveen Gupta, Sanjay Kumar Pant
In the present article, we define squeezing function corresponding to polydisk and study its properties. We investigate relationship between squeezing fuction and squeezing functio…
Constraining Cosmological and Galaxy Parameters using Strong Gravitational Lensing Systems
Darshan Kumar, Deepak Jain, Shobhit Mahajan +2
Strong gravitational lensing along with the distance sum rule method can constrain both cosmological parameters as well as density profiles of galaxies without assuming any fiducia…
Normality and Montel's Theorem
Gopal Datt, Sanjay Kumar
In this article, we prove a normality criterion for a family of meromorphic functions having zeros with some multiplicity which involves sharing of a holomorphic function by the me…
A normality Criterion for a Family of Meromorphic Functions
Gopal Datt, Sanjay Kumar
Schwick, in [6], states that let be a family of meromorphic functions on a domain and if for each , , for , where $n,…
Cosmic transparency and acceleration
R. F. L. Holanda, S. H. Pereira, Deepak Jain
In this paper, by considering an absorption probability independent of photon wavelength, we show that current type Ia supernovae (SNe Ia) and gamma ray burst (GRBs) observations p…
Bounds on graviton mass using weak lensing and SZ effect in galaxy clusters
Akshay Rana, Deepak Jain, Shobhit Mahajan +1
In General Relativity (GR), the graviton is massless. However, a common feature in several theoretical alternatives of GR is a non-zero mass for the graviton. These theories can be…
Constraints on a possible evolution of mass density power-law index in strong gravitational lensing from cosmological data
R. F. L. Holanda, S. H. Pereira, Deepak Jain
In this work, by using strong gravitational lensing (SGL) observations along with Type Ia Supernovae (Union2.1) and gamma ray burst data (GRBs), we propose a new method to study a…
Probing the cosmic distance duality relation using time delay lenses
Akshay Rana, Deepak Jain, Shobhit Mahajan +2
The construction of the cosmic distance-duality relation (CDDR) has been widely studied. However, its consistency with various new observables remains a topic of interest. We prese…
Revisiting the distance duality relation using a non-parametric regression method
Akshay Rana, Deepak Jain, Shobhit Mahajan +1
The interdependence of luminosity distance, and angular diameter distance, given by the distance duality relation (DDR) is very significant in observational cosmology.…
Transition Redshift: New constraints from parametric and nonparametric methods
Nisha Rani, Deepak Jain, Shobhit Mahajan +2
In this paper, we use the Cosmokinematics approach to study the accelerated expansion of the Universe. This is a model independent approach and depends only on the assumption that…
A Criterion for quasi normality in
Gopal Datt, Sanjay Kumar
In this article, we give a Zalcman type renormalization result for the quasinormality of a family of holomorphic functions on a domain in that takes values in a comp…
On a Theorem of Schwick
Gopal Datt, Sanjay Kumar
Let D be a domain, n, k be positive integers and n >= K+3. Let F be a family of functions meromorphic in D. If each f in F satisfies (f^n)^(k) not equal to 1 for z in D, then F is…
Some Normality Criteria
Gopal Datt, Sanjay Kumar
In this article we prove some normality criteria for a family of meromorphic functions which involves sharing of a non-zero value by certain differential monomials generated by the…
Diagnosing transient ionization in dynamic events
J. G. Doyle, A. Giunta, M. S. Madjarska +3
The present study aims to provide a diagnostic line ratio that will enable the observer to determine whether a plasma is in a state of transient ionization. We use the Atomic Data…
Exploring scalar field dynamics with Gaussian processes
Remya Nair, Sanjay Jhingan, Deepak Jain
The origin of the accelerated expansion of the Universe remains an unsolved mystery in Cosmology. In this work we consider a spatially flat Friedmann-Robertson-Walker (FRW) Univers…
Cosmic distance duality and cosmic transparency
Remya Nair, Sanjay Jhingan, Deepak Jain
We compare distance measurements obtained from two distance indicators, Super- novae observations (standard candles) and Baryon acoustic oscillation data (standard rulers). The Uni…