Hosted by Arijit Das, a PhD student. An overview of the Standard Model of Particle Physics.Read More
PSIT will be starting our monthly screenings -we will be kicking off with an all time classic, "2001: A Space Odyssey".Read More
Hosted by Gouree and Eswar (B20). Friedmann equations, a set of equations that governs the universe expansion.Read More
A set of equations that govern the expansion of the universe
Hosted by Kartik Bhide(B17). We will look at the discovery of the Higgs Boson, from theory to experiment and beyond.Read More
Hosted by Shubham Das (B19). Basic concepts and fundamentals of quantum information theory.Read More
We will primarily focus on Hubble tension and some mysteries behind an expanding universe.Read More
Where v is the recessional velocity with which galaxies move away from Earth, d is the distance of these galaxies from the Earth, and Ho is the Hubble’s Constant (measured in kilometres per second per megaparsec). The initial value Hubble gave for Ho was around 500 km/s/Mpc, while more recent measurements place the value of Ho at about 70 Km/s/Mpc. The significant gap between the two values shows how much of an ordeal it is to measure the value of the Hubble Constant with precision — this is where the peer discussion kicked off, hosted by Vivek Kumar (BS-MS, Batch ‘19). We discussed the different methods used to find the value of Ho, including The European Space Agency’s Planck mission, which studied anisotropies of the Cosmic Microwave Background (CMB) to try and measure the global value of Ho, the Hubble Space Telescope’s study of type 1a supernovae, and the use of gravitational waves from binary neutron star mergers.
The current accepted cosmological model is the ΛCDM (Lambda Cold Dark Matter) model, which accounts for the CMB, the large scale of celestial structures, and the universe's accelerated expansion. The Λ factor is responsible for the theorised existence of the infamous dark energy, which supposedly constitutes >69% of the total energy present in the universe. The early universe was stupendously hot and dense, but as it expanded, it slowly cooled down, got less dense, and became more ‘clumpy’ due to gravity. We get to determine the Hubble Constant (Ho) from the temperature fluctuations in the CMB and some other fancy factors that play essential roles in the ΛCDM model. The Planck Mission measured the value of Ho to be 67.31.2 Km/s/Mpc. Similarly, Vivek discussed the value measured by the Hubble Space Telescope, which studied red-shifts keeping Type 1a supernovae as the standard candles, as 73.24 1.74 Km/s/Mpc
The discrepancies in the value of Ho arise due to the varying degree of cosmological models we assume beforehand. If there is an error in the model, it will also be reflected in the value of Ho. The ΛCDM may have slight optimisation issues (either computational or theoretical), thus giving inaccurate values of the Hubble Constant, or our observation methods need to be amended. The peer discussion ended with the possibility of our current accepted cosmological model – ΛCDM, to be a flawed description of the Universe and that another model needs to be made to try and understand the ever-increasing rapidity of the expansion of the Cosmos.
Hosted by Aadi(B19). We will focus on the particle in a box problem, applications and insights on the same.Read More
To better account for the discrete energy of the electrons, one can represent them in k space, with the wave vectors in 3D being the coordinates of particles in this space. We find that the energy of a collection of electrons depends on the box's volume, suggesting that these electrons exert some pressure on the box walls. This pressure, known as electron degeneracy pressure, prevents the collapse of massive stars due to their gravity. This pressure can be accounted for in labs as a significant contributor to the bulk modulus of metals. The discussion was concluded with an interactive Q&A session which explored various concepts surrounding the PIB model.