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Stochastic electrodynamics (SED) is a variant of classical electrodynamics (CED) of theoretical physics. SED consists of a set of controversial theories that posit the existence of a classical Lorentz invariant radiation field having statistical properties similar to that of the electromagnetic zero-point field (ZPF) of quantum electrodynamics (QED).
PVLAS aims to carry out a test of quantum electrodynamics and possibly detect dark matter at the Department of Physics and National Institute of Nuclear Physics in Ferrara, Italy. It searches for vacuum polarization causing nonlinear optical behavior in magnetic fields. Experiments began in 2001 at the INFN Laboratory in Legnaro and continue today with new equipment.
In high-energy physics, the Landau–Pomeranchuk–Migdal effect, also known as the Landau–Pomeranchuk effect and the Pomeranchuk effect, or simply LPM effect, is a reduction of the bremsstrahlung and pair production cross sections at high energies or high matter densities. It is named in honor to Lev Landau, Isaak Pomeranchuk and Arkady Migdal.
The light-front quantization of quantum field theories provides a useful alternative to ordinary equal-time quantization. In particular, it can lead to a relativistic description of bound systems in terms of quantum-mechanical wave functions. The quantization is based on the choice of light-front coordinates, where plays the role of time and the corresponding spatial coordinate is . Here, is the ordinary time, is one Cartesian coordinate, and is the speed of light. The other two Cartesian coordinates, and , are untouched and often called transverse or perpendicular, denoted by symbols of the type . The choice of the frame of reference where the time and -axis are defined can be left unspecified in an exactly soluble relativistic theory, but in practical calculations some choices may be more suitable than others.
Sandip Trivedi is an Indian theoretical physicist working at Tata Institute for Fundamental Research (TIFR) at Mumbai, India, while he is its current director. He is well known for his contributions to string theory, in particular finding the first models of accelerated expansion of the universe in low energy supersymmetric string. His research areas include string theory, cosmology and particle physics. He is now member of program advisory board of International Center for Theoretical Sciences (ICTS). He is also the recipient of the Infosys Prize 2010 in the category of Physical Sciences.
In strong interaction physics, light front holography or light front holographic QCD is an approximate version of the theory of quantum chromodynamics (QCD) which results from mapping the gauge theory of QCD to a higher-dimensional anti-de Sitter space (AdS) inspired by the AdS/CFT correspondence proposed for string theory. This procedure makes it possible to find analytic solutions in situations where strong coupling occurs, improving predictions of the masses of hadrons and their internal structure revealed by high-energy accelerator experiments. The most widely used approach to finding approximate solutions to the QCD equations, lattice QCD, has had many successful applications; however, it is a numerical approach formulated in Euclidean space rather than physical Minkowski space-time.
A coherent perfect absorber (CPA), or anti-laser, is a device which absorbs coherent light and converts it to some form of internal energy such as heat or electrical energy. It is the time-reversed counterpart of a laser. The concept was first published in the July 26, 2010, issue of Physical Review Letters, by a team at Yale University led by theorist A. Douglas Stone and experimental physicist Hui W. Cao. In the September 9, 2010, issue of Physical Review A, Stefano Longhi of Polytechnic University of Milan showed how to combine a laser and an anti-laser in a single device. In February 2011 the team at Yale built the first working anti-laser. It is a two-channel CPA device which absorbs the output of two lasers, but only when the beams have the correct phases and amplitudes. The initial device absorbed 99.4 percent of all incoming light, but the team behind the invention believe it will be possible to achieve 99.999 percent. Originally with the FP cavity, the optical CPA operates to a specific frequency and the wavelength-thick material. In January 2012, thin-film CPA has been proposed by utilizing the achromatic dispersion of metal, exhibiting the unparalleled bandwidth and thin profile advantages. This theoretical evaluation was experimentally demonstrated in 2014.
Modern searches for Lorentz violation are scientific studies that look for deviations from Lorentz invariance or symmetry, a set of fundamental frameworks that underpin modern science and fundamental physics in particular. These studies try to determine whether violations or exceptions might exist for well-known physical laws such as special relativity and CPT symmetry, as predicted by some variations of quantum gravity, string theory, and some alternatives to general relativity.
In quantum electrodynamics (QED), the Schwinger limit is a scale above which the electromagnetic field is expected to become nonlinear. The limit was first derived in one of QED's earliest theoretical successes by Fritz Sauter in 1931 and discussed further by Werner Heisenberg and his student Hans Heinrich Euler. The limit, however, is commonly named in the literature for Julian Schwinger, who derived the leading nonlinear corrections to the fields and calculated the rate of electron–positron pair production in a strong electric field. The limit is typically reported as a maximum electric field or magnetic field before nonlinearity for the vacuum of
Rohini Godbole is an Indian physicist and academic specializing in elementary particle physics: field theory and phenomenology. She is currently a professor at the Centre for High Energy Physics, Indian Institute of Science, Bangalore. She has worked extensively on different aspects of particle phenomenology over the past three decades, in particular on exploring different aspects of the Standard Model of Particle Physics (SM) and the physics beyond it (BSM). Her work regarding hadronic structure of high-energy photons outlined a variety of ways in which to study it and has had implications for the design of next generation electron positron colliders. She is an elected fellow of all the three academies of Science of India and also the Science Academy of the Developing World (TWAS).
The Breit–Wheeler process or Breit–Wheeler pair production is a proposed physical process in which a positron–electron pair is created from the collision of two photons. It is the simplest mechanism by which pure light can be potentially transformed into matter. The process can take the form γ γ′ → e+ e− where γ and γ′ are two light quanta.
The light-front quantization of quantum field theories provides a useful alternative to ordinary equal-time quantization. In particular, it can lead to a relativistic description of bound systems in terms of quantum-mechanical wave functions. The quantization is based on the choice of light-front coordinates, where plays the role of time and the corresponding spatial coordinate is . Here, is the ordinary time, is a Cartesian coordinate, and is the speed of light. The other two Cartesian coordinates, and , are untouched and often called transverse or perpendicular, denoted by symbols of the type . The choice of the frame of reference where the time and -axis are defined can be left unspecified in an exactly soluble relativistic theory, but in practical calculations some choices may be more suitable than others. The basic formalism is discussed elsewhere.
In particle physics, true muonium is a theoretically predicted exotic atom representing a bound state of an muon and an antimuon (μ+μ−). The existence of true muonium is well established theoretically within the Standard Model. Its properties within the Standard Model are determined by quantum electrodynamics, and may be modified by physics beyond the Standard Model.
Norman Myles Kroll was an American theoretical physicist, known for his pioneering work in QED.
Alexandra Olaya-Castro is a Colombian-born theoretical physicist, currently a Professor in the Department of Physics and Astronomy at University College London. She is also the Vice-Dean for the Mathematical and Physical science Faculty.
Suresh Kumar Bhatia is an Indian-born chemical engineer and a professor at the School of Chemical Engineering, University of Queensland. He is known for his studies on porous media and catalytic and non-catalytic solid fluid reactions. He was awarded an ARC Australian Professorial Fellowship (2010–15) and is an elected fellow of the Indian Academy of Sciences (1993), and the Australian Academy of Technological Sciences and Engineering (2010). In 1993, the Council of Scientific and Industrial Research, the Indian government's peak agency for scientific research, awarded him the Shanti Swarup Bhatnagar Prize for Science and Technology, one of the highest Indian science awards, for his contributions to the engineering sciences.
Probir Roy is an Indian particle physicist and a former professor at Tata Institute of Fundamental Research. He is also a senior scientist of the Indian National Science Academy at Bose Institute and a former Raja Ramanna fellow of Department of Atomic Energy at Saha Institute of Nuclear Physics.
Biswarup Mukhopadhyaya is an Indian theoretical high energy physicist and a senior professor at Indian Institute of Science Education and Research, Kolkata. Known for his research on High energy colliders, Higgs bosons, neutrinos, Mukhopadhyaya is an elected fellow of the National Academy of Sciences, India. The Council of Scientific and Industrial Research, the apex agency of the Government of India for scientific research, awarded him the Shanti Swarup Bhatnagar Prize for Science and Technology, one of the highest Indian science awards, for his contributions to physical sciences in 2003.
Kare Narain Pathak is an Indian Theoretical Condensed Matter Physicist, Professor Emeritus and Former Vice-Chancellor of the Panjab University. He is an elected Fellow of several science academies such as the Indian Academy of Sciences, Indian National Science Academy, National Academy of Sciences, India, National Research Council Canada and Punjab Academy of Sciences.
References
- ↑ "The Women Scientists of India". Indian Academy of Sciences. Retrieved 13 September 2018.
- 1 2 3 "Anuradha Misra". Mumbai University. Retrieved 27 November 2018.
- ↑ "S. D. Joglekar". IIT Kanpur. Retrieved 23 February 2019.
- 1 2 "Research of Anuradha Misra" (PDF). Indian Academy of Sciences. Retrieved 27 November 2018.