A5076598957- Noncommutative and Quantum Gravity Theories
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Obesity, Physical Activity, Diet
- Urban Transport and Accessibility
- Atomic and Subatomic Physics Research
- Transportation and Mobility Innovations
- Computational Physics and Python Applications
- Pulsars and Gravitational Waves Research
- Child Nutrition and Water Access
- Transportation Planning and Optimization
- Earthquake Detection and Analysis
- Ionosphere and magnetosphere dynamics
- South Asian Studies and Conflicts
- Consumer Attitudes and Food Labeling
- GNSS positioning and interference
- High-pressure geophysics and materials
- Obesity and Health Practices
- Geophysics and Gravity Measurements
- Particle physics theoretical and experimental studies
- South Asian Cinema and Culture
- Diet and metabolism studies
- Cold Atom Physics and Bose-Einstein Condensates
- Urban and Freight Transport Logistics
Perimeter Institute
2021-2022
University of Lahore
2022
University of Toronto
2022
Max Planck Institute for Radio Astronomy
2021
University of New Brunswick
2016-2019
National University of Malaysia
2006
Continued observations of the Double Pulsar, PSR J0737-3039A/B, consisting two radio pulsars (A and B) that orbit each other with a period 2.45hr in mildly eccentric (e=0.088) binary system, have led to large improvements measurement relativistic effects this system. With 16-yr data span, results enable precision tests theories gravity for strongly self-gravitating bodies also reveal new been expected but are now observed first time. These include light propagation strong gravitational...
We apply the idea of using a matter-time gauge in quantum gravity to cosmology. For Friedmann-Lema\^{\i}tre-Robertson-Walker (FLRW) universe with dust and cosmological constant $\mathrm{\ensuremath{\Lambda}}$, we show that dynamics maps exactly simple harmonic oscillator dust-time gauge. $\mathrm{\ensuremath{\Lambda}}>0$ frequency is imaginary, for $\mathrm{\ensuremath{\Lambda}}<0$ it real, $\mathrm{\ensuremath{\Lambda}}=0$ free particle. This result provides (i) general demonstration...
We study general relativity with pressureless dust in the canonical formulation, field chosen as a matter time gauge. The resulting theory has three physical degrees of freedom metric field. linearized reveals two graviton modes and scalar mode. find that remain Lorentz covariant despite gauge, mode is ultralocal. also discuss modification to include parameter Hamiltonian analogous Horava–Lifshitz models. In this case no longer ultralocal it acquires propagation speed dependent on...
We study the Hamiltonian dynamics of dust-Bianchi IX universe in dust time gauge. This model has three physical metric degrees freedom, with evolution determined by a time-independent Hamiltonian. approach gives new picture where is described oscillations between dust-Kasner solutions, rather than vacuum-Kasner solutions. derive generalized transition law these phases, which matter component. Sufficiently close to singularity, we show that this reduces vacuum Belinski-Khalatnikov-Lifshitz...
We study the polymer quantization of a homogeneous massive scalar field in early universe using prescription inequivalent to those previously appearing literature. Specifically, we assume Hilbert space for which momentum is well defined but its amplitude not. This closer spirit scheme loop quantum gravity, no unique configuration operator exists. show that semi-classical approximation, main effect this compactify phase chaotic inflation direction. gives rise an effective potential closely...
Any approach to pure quantum gravity must eventually face the question of coupling matter theory. In past, several ways spin foam have been proposed, but dynamics coupled matter-gravity system is challenging explore. To take first steps toward uncovering influence has on models, we couple free, massive scalar lattice field theory a restricted, semiclassical 4D model, called cuboids. This model can be understood as superposition hypercuboidal (and, thus, irregular) lattices. Both theories are...
The nutritional status of adolescents is utmost importance as this stage life accounts for the massive growth and maturation human body. Substandard during adolescence a significant determinant health outcomes later in life. Objectives: To assess compare dietary habits school-going rural urban areas. Methods: A cross-sectional study was conducted to from different schools total 100 participants were selected through non-probability sampling technique. Participants assessed using standardized...
The quantum theory of the Friedmann cosmological model with dust and constant ($Λ$) is not exactly solvable analytically. We apply Path Integral Monte Carlo (PIMC) techniques to study its dynamics using physical Hamiltonian corresponding field as a clock. (i) fluctuations around classical paths (ii) formulate analogues no-boundary tunnelling proposals simulate ground state wave functions. For $Λ< 0$ unique function exists. $Λ> bounded below, but path integral for propagator convergent...
The solar energy affects on the ionosphere is of a major concern and being investigated worldwide. As an ever changing-medium it difficult to precisely determine TEC, which also subjected seasonal variations. Conjugate stations allow excellent opportunities learn any asymmetric properties its phenomena. With these respects, this paper examine GPS derived TEC variations during vernal autumnal equinoxes period for year 2003 at polar conjugate stations. A month data (two weeks before after...
The prevalence of obesity is increasing day by and becoming a serious issue worldwide. Obesity leads to different chronic diseases such as diabetes, CVD, hypertension etc. In attempts lose weight faster people try diets Fad are part these diets. Keto genic diet, Atkins vegan liquid diet some examples Objective: To assess the emergence fad related perceptions practices among university students. Methods: A cross sectional study design with sample size 100 students were randomly selected from...
<div>Toronto is city divided. The city’s public transportation system not an exception to this pattern. A move away from tokens, tickets, passes and cash towards smart technology modernization excluding a large population of Torontonians who rely on but lack resources, face limited connectivity fare subsidy programs traditional methods payment. This paper aims answer the question: How has implementation PRESTO Toronto Transit Commission furthered transit inequity in City Toronto?...
<div>Toronto is city divided. The city’s public transportation system not an exception to this pattern. A move away from tokens, tickets, passes and cash towards smart technology modernization excluding a large population of Torontonians who rely on but lack resources, face limited connectivity fare subsidy programs traditional methods payment. This paper aims answer the question: How has implementation PRESTO Toronto Transit Commission furthered transit inequity in City Toronto?...
Any approach to pure quantum gravity must eventually face the question of coupling matter theory. In past, several ways spin foam have been proposed, but dynamics coupled matter-gravity system is challenging explore. To take first steps towards uncovering influence has on models, we couple free, massive scalar lattice field theory a restricted, semi-classical 4d model, called cuboids. This model can be understood as superposition hypercuboidal (and thus irregular) lattices. Both theories are...