[Astro] [CAPT] Particle Cosmology and Gravity Seminar this week: Dibya Chakraborty (IIT Madras)

[Swagat Mishra]

Dear All,
                    This Tuesday, we have Dibya Chakraborty, a postdoc at the Indian Institute of Technology Madras, delivering an online seminar. The details are given below.

  1.

Speaker: Dibya Chakraborty (IIT Madras)


            Seminar date: 1st  October, Tuesday 1 pm

           Venue: Seminar Room A 113

            Title: Inflationary Models in String Theory

Abstract: In this talk, I will discuss a phenomenon called cosmic inflation in which the Universe went through accelerated expansion to solve the horizon problem of Cosmological Microwave Background within a billionth of a trillionth of a trillionth of a second, in the very early Universe. This accelerated expansion, in its minimal form, is driven by a scalar field (inflaton) and it takes place when this scalar field slowly rolls down a potential well. However, the origin of this scalar field and the correct form of the scalar potential remains an open question in cosmology. I will present a string theory motivated model where the inflaton is connected to the geometry of the internal space -- the overall volume of it drives the inflation. In particular, I will present a construction where the overall volume modulus (scalar field) is dynamically stabilized to an exponentially large value only via perturbative corrections, also known as perturbative large volume scenario (LVS). In this framework, the robustness of the single-field inflationary model is checked against possible sub-leading corrections. In the later part of my talk, I will focus on the global embedding of the fibre inflation in perturbative LVS and show how our constructions pose less challenge in realizing a successful period of inflation.


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A list of upcoming seminars for this term (with rough titles)

·   08 Oct | Theo Anton (QMUL) | Modified Gravity
·   10 Oct | Kieran Wood (Nottingham) | Multi-metric gravity and Gregory-Leflamme instability (Journal Club time)
·   15 Oct | Eemeli Tomberg (Lancaster U) | Compaction function for Primordial Black Holes
·    22 Oct | Ayngaran Thavanesan (DAMTP Cambridge) | Cosmological CPT theorem
·    29 Oct | Santiago Agui Salcedo (DAMTP Cambridge) | Open EFT for inflation
·    05 Nov | Yuyu Mo (Edinburgh Higgs Centre) | Bootstrap
·   12 Nov | Alex Jenkins (UCL) | Quantum Matter, Analogue Gravity
·   19 Nov |  Bjoern Friedrich (Heidelberg) | String Phenomenology
·    26 Nov | Tamara Evstafyeva (DAMTP Cambridge) | Gravitational Waves
·    03 Dec | Emma Albertini (Imperial College London) | Gravity, Scattering Amplitudes
·    10 Dec | TBD
With Regards,
-Swagat



Swagat Saurav Mishra,

Postdoctoral Research Associate

​

Particle Cosmology Group,

Centre for Astronomy and Particle Theory,

University of Nottingham, Nottingham NG7 2RD, UK.

Website: https://swagatam18.wordpress.com/

Research Link:https://inspirehep.net/authors/1517353

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