Nathan moynihan nathan moynihan theoretical physicist. Today, it finds itself a field divided, with two major contenders dominating. My research focus is on the fundamental physics that underlies the nature of the universe. Pdf making use of the tduality symmetry of superstring theory, and of the double geometry. Centre for radio cosmology department of physics and astronomy university of the western cape july 2, 2019. Point particle motion in dft and a singularityfree. Amanda weltman making use of the tduality symmetry of superstring theory, and of the double geometry from double field theory, we argue that cosmological singularities of a homogeneous and. Neuware in this book we study the problem of moduli stabilisation in a cosmological context of string theory. Amanda weltman, cosmological moduli dynamics, jhep 0707. Chameleon cosmology, amanda weltman lecture 1 of 1 youtube.
My research is also now focused on using machine learning both as a tool for analysing big datasets from cosmology to neuroscience as well as in the framework of reinforcement learning to study cognition and awareness. Zrfqz82odg studies in string cosmology \ pdf studies in string cosmology by amanda weltman vdm verlag dez 2008, 2008. Renato costa, guilherme franzmann, amanda weltman download pdf. Postdoctoral position in hepcat group at the university of. Dejan stojkovic department of physics university at. South african research chair in physical cosmology, department of mathematics and applied mathematics, university of cape town. Together with the string theory group qgaslab and the astronomy department, the cgg forms. Apply for postdoctoral fellowships in the hepcat group. Amanda hopes to develop a fundamental theory to explain dark energy and the cosmological constant, einsteins socalled fudge factor, that appears to be causing the accelerated expansion of our universe. She completed her phd under the supervision of renowned string theorist brian greene in 2007.
If such a field exists, then it is generally assumed that its. Postdoctoral fellowship in the high energy physics. Amanda weltman making use of the tduality symmetry of superstring theory and of the double geometry from double field theory, we argue that cosmological singularities of a homogeneous and. Robert brandenberger, renato costa, guilherme franzmann, and amanda weltman. The south african research chair sarchi in physical cosmology awarded to associate professor amanda weltman is based in the mathematics and applied mathematics department at the university of cape town. Applicants should please send 1 pdf file including your cv, publications if any, academic transcripts and a brief statement of your research interests, and arrange to have three letters of reference emailed to professor amanda weltman amanda. Amanda weltman south african research chair in physical. Chameleon cosmology justin khoury and amanda weltman institute for strings, cosmology and astroparticle physics, columbia university, new york, new york 10027, usa received 15 september 2003. Introduction cosmological observations are able to pinpoint with remarkable precision details of the universe on the largest scales, while particle physics experiments probe the nature of matter on the smallest scales. Pdf t dual cosmological solutions in double field theory.
Amanda weltman was born in cape cod, massachusetts in the usa and came to south africa when her family moved home when she was 2 months old. There are additional opportunities to perform joint work within other group research areas, including amplitudes in astrophysics, machine learning and theoretical cosmology more broadly. We invite applications from suitably qualified and experienced persons for this temporary post for six months, for. Journal of cosmology and astroparticle physics, january. Point particle motion in dft and a singularityfree cosmological solution robert brandenberger, 1,renato costa,2, yguilherme franzmann, zand amanda weltman2, x 1physics department, mcgill university, montreal, qc, h3a 2t8, canada 2cosmology and gravity group, dept. The appointment must comply with the universitys approved policies, procedures and practices for the. Pdf tdual cosmological solutions in double field theory. Pdf point particle motion in dft and a singularityfree. Pdf dual spacetime and nonsingular string cosmology.
Apply for phd fellowships in the hepcat group at the. Applicants should please send 1 pdf file including your cv, publications and a brief statement of your research interests, and arrange to have three letters of reference emailed to professor amanda weltman amanda. In 2004 khoury and weltman 1, 2 presented chameleon cosmology describing a thinshell mechanism, presented by a thinshell about objects, having a thickness directly related to the density of. Amanda weltman born 1979 is a south african theoretical physicist. She is known for coauthoring a paper proposing the chameleon theory to explain the existence of dark energy. Postdoctoral fellowship in cosmology and frbs, cape town, south africa the high energy physics, cosmology and astrophysics theory hepcat group in the department of mathematics and applied mathematics at the university of cape town uct is offering a sarchi in physical cosmology postdoctoral fellowship starting in 2020 with prof. Pdf we investigate the cosmological solutions coming from the double field theory equations of motion after coupling a matter source to them. Associate professor amanda weltman is the south african research chair in physical cosmology, and is a presidential rated theoretical physicist in the department of mathematics and applied mathematics at the university of cape town in south africa. The high energy physics, cosmology and astrophysics theory hepcat group in the department of mathematics and applied mathematics at the university of cape town uct is offering a sarchi in physical cosmology postdoctoral fellowship starting in 2020 with prof.
The evidence for the accelerated expansion of the universe and the time dependence of the. South african research chair in physical cosmology. The position is funded by the vc2030 future leaders award to prof amanda weltman. Fast radio burst cosmology and hirax amanda weltman1 and anthony walters2 1department of mathematics and applied mathematics, university of cape town, south africa, 2 department of chemistry and physics, university of kwazulunatal, durban, south africa until very recently we had as many theories to explain fast radio bursts as we have observations of them. She is currently a researcher at the university of cape town.
Detecting vanishing dimensions via primordial gravitational wave astronomy jonas r. Phd position in the hepcat group at the university of cape. Chameleon cosmology justin khoury and amanda weltman institute for strings, cosmology and astroparticle physics, columbia university, new york, ny 10027 the evidence for the accelerated expansion of the universe and the timedependence of the. String gas cosmology is a scenario for the very early stringy universe which was proposed some time ago 1 see, e. After almost a century, the field of quantum gravity remains as difficult and inspiring as ever. String gas cosmology is based on making use of the key new degrees of freedom and symmetries which distinguish string theories from point particle theories. Lemaitres visited cape town in 1952 on the occasion of a british association meeting. Watsons research focuses on the connection between fundamental particle physics and cosmology with an emphasis on physics beyond the standard model. Universitat frankfurt hiring postdoctoral fellowship in. Jacobs, gwyneth allwright, mpho mafune, samyukta manikumar, amanda weltman comments. Postdoctoral fellowship in cosmology and frbs, cape town, south africa.
Postdoctoral fellowship in cosmology and frbs, cape town. Students will be supervised by prof amanda weltman, but likely cosupervised by. Hunting for chameleons in alp searches amanda weltman, september 2009, conference proceedings in publication, eprint archive. Lecture on chameleon cosmology given by amanda weltman at the african summer theory institute in 2004.
Born in massachusetts and raised in south africa, amanda weltman completed a distinguished undergraduate career at the university of cape town and then pursued her graduate education at columbia university in new york city. The high energy physics, cosmology and astrophysics theory group in the department of mathematics and applied mathematics at the university of cape town uct seeks highly qualified postdoctoral candidates to start in 2019. Amanda weltman 2007 george ellis 1973 charles hellaby 1989 peter dunsby 1998 research activities. Duniya, teboho moloi, chris clarkson, julien larena, roy maartens, bishop mongwane and amanda weltman view abstract view article pdf the beyondhorndeski gravity has recently been reformulated in the dark energy paradigmwhich has been dubbed, unified dark energy ude. The aim of this conference is to discuss key questions in early universe cosmology in the light of the question as to whether time is fundamental or emergent, i. The group has 2 core faculty members amanda weltman and shajid haque and associate members include jeff murugan, jon shock, julien. Pdf we generalize the action for point particle motion to a double field theory background. She completed her phd under the supervision of prof. About amanda weltman i am a theoretical physicist in the mathematics and applied mathematics department at the university of cape town in south africa. I am the south african research chair sarchi in physical cosmology. Amanda weltman was first drawn to physics while she was an undergraduate student at the. August 08 2014 the cosmology and gravity group at the university of cape town has 3 postdoctoral positions currently available to start by the end of 2014. Etudes on string cosmology amanda weltman, book published by vdm publishers, 2008. After deriving the general equations of motion for these.
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