Swagat Saurav Mishra
@primeval-arhsim.bsky.social
Particle@CTPU-CGA(IBS, Daejeon)|uniofnottingham.bsky.social | Interested in Big❓'s | PhD from @IUCAA || Research & Education || Physics|Mathematics|Music|Cricket|Hiking|Cafe|Fashion|🌌⚫⏳🏞️ ☮️🇮🇳🇬🇧🇰🇷
A Cosmology🧵: "Can the Inflation Field survive to act as the Dark Matter in the Universe?" In our new work on arXiv, we explore this possibility in Warm Inflation framework. 'Dark Matter as an Inflationary Relic in Warm Inflation' arxiv.org/abs/2606.22147 Happy to discuss; comments are welcome :-)
Hope you enjoy watching this latest release from 'Cosmology Talks' where Shaun & I discuss: What cosmological inference of evolving (including Phantom) Dark Energy Does & Does Not Imply - in the context of DESI BAO results and beyond. Based on my recent work on the arXiv.
Shaun Hotchkiss@justshaun.bsky.social · 2mo agoLatest DESI (+CMB +SN) data got you spooked? Seeing ghosts and *phantoms*? Don't panic! @primeval-arhsim.bsky.social is here to reassure you: "No phantoms are needed by current observational cosmology" youtu.be/etp-uezMgdw
Alongside the majority of my colleagues in the School of Physics and Astronomy at Nottingham, I have received a letter telling me I am at risk of redundancy. To my physics friends - please sign this letter to help us save our amazing School nottinghamphysics.github.io/Open_Letter/
Save Nottingham Physics and Astronomy
nottinghamphysics.github.io
Please sign to provide support 🙏
Tony Padilla #JFT97 Don’t buy the S*n@proftonypadilla.bsky.social · 3mo agoDear academic colleagues. Please sign and share this open letter expressing your support for Physics & Astronomy at Nottingham, as the university plans unnecessary and devastating cuts. One in three academics staff expected to lose their jobs nottinghamphysics.github.io/Open_Letter/...
Dear academic colleagues. Please sign and share this open letter expressing your support for Physics & Astronomy at Nottingham, as the university plans unnecessary and devastating cuts. One in three academics staff expected to lose their jobs nottinghamphysics.github.io/Open_Letter/...
Save Nottingham Physics and Astronomy
nottinghamphysics.github.io
Dec 24 - Cosmic Bell Inequalities arxiv.org/abs/1508.01082 Maldacena writes down a model of inflation where the statistics of certain hot and cold spots encode the outcome of a Bell-measurement. This shows that the quantum nature of inflation can survive in conventional classical observables
Dec 21 - Conformal Technicolor arxiv.org/abs/hep-ph/0... Luty & Okui rephrase the hierarchy problem as a statement about the relationship between the dimensions of operators. The idea is that the Higgs has a dimension near 1 but all the operators in its OPE have dimensions > 4.
We are announcing the *Early Universe from Home 2025* conference, whose registration is now open. Please share with colleagues and collaborators
Shaun Hotchkiss@justshaun.bsky.social · 2y agoRegistration for *Early Universe from Home 2025* is now open! (running 25-28 Feb) It will be the best place to learn about and discuss... - correlators - phase transitions - topological defects - primordial black holes - and other early structures. earlyuniverse.cosmodiscussion.com
Dec 14 - cosmological perturbation theory in 1+1 D arxiv.org/abs/1502.07389 McQuinn and White study the evolution of structure in 1+1 dimensions, where the all-loop results can be calculated. They show SPT has a finite radius of convergence but doesn't converge to simulations.
I feel like I need to break the ice here somehow... I suppose I will just announce that I will be posting my annual AxionLimits yearly round-up on this account soon, so stay tuned i guess
Dec 12 - A de Sitter S-matrix arxiv.org/abs/1209.6039 Marolf et al. define an S-matrix for massive particles in (fixed) global dS. They prove that many facts about flat space S-matrix also apply to dS. They develop a lot of interesting ideas that should have a wide range of applications
Another favorite paper of mine. I have read and reread this paper multiple times
Daniel Green@dangreen.bsky.social · 2y agoDec 11 - The Phase Transition to Eternal Inflation arxiv.org/abs/0802.1067 Creminelli et al define the transition to slow-roll eternal inflation by the diverging volume of the reheating surface. They offer a precise prediction for the amplitude of the power spectrum where this occurs.
Dec 10 - Detectors and Rindler Particles journals.aps.org/prd/abstract... Unruh and Wald give a fantastically clear explanation of why accelerating observers see a thermal spectrum of particles: the particles are created from the energy you put into the detector to accelerate it.
Dec 9 - Axion-electron coupling limit from 47 Tucanae arxiv.org/abs/1507.05665 Studying white dwarf cooling in this globular cluster, Hansen et al. bound the axion coupling g_ae < 8.4E-14. This excludes the hint of axion cooling seen in previous studies (eg arxiv.org/abs/0806.2807).
It’s #introduction time! - I create universes using supercomputers as a job - I’m eternally fascinated by all the mysteries of the cosmos - currently trying to unveil some of the properties of dark energy - passionate advocate for equity in science Looking forward to interact with ya’ll!
(1/7) As I’m new here I thought I should introduce myself! My name is Olly Long and I am a researcher working on modelling the binary black hole problem in General Relativity.
Dec 8 - EFT / model building and the anomalous perihelion of mercury arxiv.org/abs/1106.1568 Wells explores how a model building / EFT approach to explaining Mercury's orbit would have worked. He introduces 3 ideas that all can work, and are realized in GR in different gauges.
This is absolutely my favourite paper! I love it and I also had a little history in it because Scott talked to me about an idea of mine which evaded this strong constraint! Why is it such a beautiful paper ? Let’s discuss it! 1/n
Daniel Green@dangreen.bsky.social · 2y agoDec 6 - Coherent Phase Argument for Inflation arxiv.org/abs/hep-ph/0... The horizon problem in the era of precision CMB is better understood in terms of the fact that all sound waves have the same phase. Dodelson provides a simple and powerful explanation of this modern argument.
Dec 7 - The Age of the Universe arxiv.org/abs/astro-ph... Combining data from CBI, DASI, BOOMERANG ++, Seivers et al. measure the age to be 13.7 +/- 0.2 billion years in near perfect agreement the modern value. This is when cosmology becomes a precision subject, giving tight errors on LCDM.
One of my favorite papers
Daniel Green@dangreen.bsky.social · 2y agoDec 6 - Coherent Phase Argument for Inflation arxiv.org/abs/hep-ph/0... The horizon problem in the era of precision CMB is better understood in terms of the fact that all sound waves have the same phase. Dodelson provides a simple and powerful explanation of this modern argument.
Three PhD positions in theoretical physics 🧪⚛️ are open at the TPPC in King's College London with three excellent supervisors!
Malcolm Fairbairn@malcfairbairn.bsky.social · 2y agoCome and do a PhD www.kcl.ac.uk/research/the...
Dec 4 - An EFT for Holographic RG (Kaplan & Wang) arxiv.org/pdf/1406.4152 This paper writes the non-relativistic EFT in AdS that is dual to a large class of relativistic RG flows on the boundary. The construction of the bulk theory is the AdS analogue of the EFT of Inflation.
I am looking for a PhD student for the OCT 2025 intake to work on dynamical compactification of extra dimensions or on boson stars GW signatures! www.kcl.ac.uk/research/the...
Theoretical Particle Physics & Cosmology
The research focus of the TPPC Group is on tests of new models of particle physics beyond the Standard Model, including supersymmetry, large extra dimensions and strings.
kcl.ac.uk
Dec 3 - Dark Energy Survey CMB-free H0 measurement arxiv.org/abs/1711.00403 Combining BBN+BAO+weak lensing they measure H0 = 67.4 +/- 1.1 km/s/Mpc, in agreement with the CMB without using CMB data. This was the first measurement of its kind at essentially current day precision.
Dec 2 - Scattering to many particles is (semi)-classical Eg inspirehep.net/literature/2... arxiv.org/abs/hep-ph/9... Two to N scattering is described by a semi-classical solution to the equations of motion (controlled by large N). This property of rare processes is far more general
Look out for 31 posts in Physics this month by Prof. Dan Green
Daniel Green@dangreen.bsky.social · 2y agoThis December, I will be trying another experiment: Each day I will post 1 under-appreciated paper/result (my definition/no rules). I will also be posting my choices on Twitter (@nu_phases). I am curious to see which site has more interesting feedback/discussion
