BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Matthijs van der Wild (University of Freiburg) DTSTART:20200511T220000Z DTEND:20200511T230000Z DTSTAMP:20260404T110743Z UID:CosmoConB/1 DESCRIPTION:Title: Quantum Gravitational Predictions in Inflationary Scalar-Tensor T heories\nby Matthijs van der Wild (University of Freiburg) as part of CosmoConβ - Cosmology from Home\n\n\nAbstract\nThe recent observations by Planck allow generalisations of the traditional single-field inflationary models in the form of scalar-tensor theories. These theories have in comm on that they exhibit a non-minimal coupling of the inflaton field to gravi ty. This non-minimal coupling could imply that the effects of quantum grav ity are enhanced with respect to the predictions of general relativity. In this talk I will present one formalism of quantum gravity called quantum geometrodynamics\, and show how this formalism can be used to systematical ly derive predictions of quantum gravitational effects in the inflationary observables\, and will briefly comment on the experimental observability of these effects in general inflationary scalar-tensor theories.\n\nRecord ed video of talk: ht tps://www.youtube.com/watch?v=alUnWdC22zs\n\nTalk based in part on:
\n[1904.12861] Quantum gravita tional corrections to the inflationary power spectra in scalar-tensor theo ries
\n[1712.08543] Qua ntum gravitational corrections from the Wheeler-DeWitt equation for scalar -tensor theories\n LOCATION:https://stable.researchseminars.org/talk/CosmoConB/1/ END:VEVENT BEGIN:VEVENT SUMMARY:Amanda Weltman (University of Cape Town) DTSTART:20200511T220000Z DTEND:20200511T230000Z DTSTAMP:20260404T110743Z UID:CosmoConB/2 DESCRIPTION:Title: Fast Radio Bursts and Cosmology\nby Amanda Weltman (Universit y of Cape Town) as part of CosmoConβ - Cosmology from Home\n\n\nAbstract\ nFast Radio Bursts are an exciting new area of study in transient and radi o astronomy\, with a plethora of possible physical driving mechanisms.They also hold the potential to be tools for understanding our universe on cos mological scales as well as for probing some fundamental physics questions . In this talk we will take a gentle stroll through some of these ideas an d introduce the HIRAX experiment\, hosted in South Africa\, the next stat e of the art radio interferometer for detecting and localising Fast Radio Bursts.\n\nVideo of talk: https://www.youtube.com/watch?v=WswfvsmnOm8\n\nRelevant papers:< br>\n[arxiv: 1909.02821] Probin g Diffuse Gas with Fast Radio Bursts
\n[arxiv: 1905.07132] Fast Radio Burst Cosmology & HIRAX
\n\nOther References:
\nFRB Theory wiki: https://frbtheorycat.org/index.php/Main_Page< /a>
\nA Living Theory Catalogue for FRBs: https://arxiv.org/abs/1810.05836
\nAmanda Weltman talk on "FRBs and Cosmo logy" at Cosmology Talks\, hosted by Shaun Hotchkiss\n LOCATION:https://stable.researchseminars.org/talk/CosmoConB/2/ END:VEVENT BEGIN:VEVENT SUMMARY:William H. Kinney (University at Buffalo) DTSTART:20200504T220000Z DTEND:20200504T230000Z DTSTAMP:20260404T110743Z UID:CosmoConB/3 DESCRIPTION:Title: Eternal Hilltop Inflation\nby William H. Kinney (University a t Buffalo) as part of CosmoConβ - Cosmology from Home\n\n\nAbstract\nEter nal inflation has long been known to be generic in large-field inflation m odels\, where one or more scales in the problem exceed the Planck scale. I consider the case of small-field inflation\, in the limit of hilltop-type potentials\, where the region in field space admitting eternal inflation is exponentially small. In particular\, I consider a simplified model of t he hilltop in which the evolution of the inflaton is at all times dominate d by quantum evolution instead of classical slow roll\, and show that eter nal inflation occurs even when all scales in the potential are arbitrarily far below the Planck scale. This provides a simple and clear demonstratio n that quantum effects at energy scales very small relative to the Planck scale can have an order-unity or larger effect on the global structure of spacetime. I comment on such models in light of recently proposed "Swampla nd" conjectures.\n\nVideo of Talk: https://www.youtube.com/watch?v=qL3m4M4IZi4\n\nRelevant Papers:
\n[1601.08140] Eter nal Hilltop Inflation\, by Gabriela Barenboim\, William H. Kinney\, Wa n-Il Park
\n[1811.11698] Et ernal Inflation and the Refined Swampland Conjecture\, by William H. K inney\n LOCATION:https://stable.researchseminars.org/talk/CosmoConB/3/ END:VEVENT BEGIN:VEVENT SUMMARY:Benjamin Wallisch (IAS & UCSD) DTSTART:20200501T220000Z DTEND:20200501T230000Z DTSTAMP:20260404T110743Z UID:CosmoConB/4 DESCRIPTION:Title: Constraining Primordial Features Beyond the Linear Regime\nby Benjamin Wallisch (IAS & UCSD) as part of CosmoConβ - Cosmology from Hom e\n\n\nAbstract\nCharacterizing the nature of inflation is one of the main challenges in cosmology. Oscillatory features in the power spectrum of pr imordial density fluctuations are an important signature of inflationary p hysics beyond its simplest incarnations. In this talk\, I will show that w e can reliably search for these imprints in the distribution of galaxies i n the late-time universe. This is based on the insight that the impact of nonlinear evolution of the density fluctuations is a tractable problem. Co nsequently\, we can use the full statistical power of current and future g alaxy surveys to search for these inflationary imprints. By generalizing t he standard BAO analysis\, we infer the most stringent constraints on prim ordial features to date from the BOSS DR12 dataset.\n\nVideo of Talk: https://www.youtube.com/ watch?v=jVRXaeHSk9o\n\nRelevant Paper: [1906.08758] Primordial Features from Linear to Nonlinear Scal es\, by Florian Beutler\, Matteo Biagetti\, Daniel Green\, Anže Slosa r\, Benjamin Wallisch\n LOCATION:https://stable.researchseminars.org/talk/CosmoConB/4/ END:VEVENT BEGIN:VEVENT SUMMARY:Eemeli Tomberg (NICPB\, Tallinn) DTSTART:20200415T220000Z DTEND:20200415T230000Z DTSTAMP:20260404T110743Z UID:CosmoConB/5 DESCRIPTION:Title: Preheating in Higgs-like Palatini Inflation\nby Eemeli Tomber g (NICPB\, Tallinn) as part of CosmoConβ - Cosmology from Home\n\n\nAbstr act\nI discuss preheating in a plateau model similar to Higgs inflation\, but with the Palatini formulation of general relativity. Due to the shape of the inflaton potential\, the oscillation amplitude of the inflaton fiel d stays almost constant for many oscillations\, so that the field returns repeatedly to the plateau. This has drastic implications on reheating dyna mics: the leading channel of particle production is a tachyonic instabilit y of the inflaton field itself. This leads to an almost instantaneous rehe ating. \n\nVideo of Talk: https://www.youtube.com/watch?v=xWskD0Pmcqo\n\nTalk based on [1902.10148] Preheating in Palatin i Higgs inflation\, by Javier Rubio\, Eemeli S. Tomberg\n LOCATION:https://stable.researchseminars.org/talk/CosmoConB/5/ END:VEVENT BEGIN:VEVENT SUMMARY:João Caldeira (Fermilab) DTSTART:20200501T220000Z DTEND:20200501T230000Z DTSTAMP:20260404T110743Z UID:CosmoConB/6 DESCRIPTION:Title: Comparing Methods of Uncertainty Quantification in Deep Learning Algorithms\nby João Caldeira (Fermilab) as part of CosmoConβ - Cosmo logy from Home\n\n\nAbstract\nWe present a comparison of methods for uncer tainty quantification (UQ) in deep learning algorithms in the context of a simple physical system. Three of the most common uncertainty quantificati on methods – Bayesian Neural Networks (BNN)\, Concrete Dropout (CD)\, an d Deep Ensembles (DE) – are compared to the standard analytic error prop agation. We discuss this comparison in terms endemic to both machine learn ing ("epistemic" and "aleatoric") and the physical sciences ("statistical" and "systematic"). The comparisons are presented in terms of simulated ex perimental measurements of a single pendulum – a prototypical physical s ystem for studying measurement and analysis techniques. Our results highli ght some pitfalls that may occur when using these UQ methods. For example\ , when the variation of noise in the training set is small\, all methods p redicted the same relative uncertainty independently of the inputs. This i ssue is particularly hard to avoid in BNN. On the other hand\, when the te st set contains samples far from the training distribution\, we found that no methods sufficiently increased the uncertainties associated to their p redictions. This problem was particularly clear for CD. In light of these results\, we make some recommendations for usage and interpretation of UQ methods.\n\nVideo of talk: https://www.youtube.com/watch?v=K3UYWQMP_Hs\n\nRelevant Paper: [2004.10710] Deeply Uncertain: Comparing Methods of Uncertainty Quantification in Deep Learning Algorithm s\n LOCATION:https://stable.researchseminars.org/talk/CosmoConB/6/ END:VEVENT BEGIN:VEVENT SUMMARY:Nicolás Bernal (Antonio Narino University) DTSTART:20200507T220000Z DTEND:20200507T230000Z DTSTAMP:20260404T110743Z UID:CosmoConB/7 DESCRIPTION:Title: Boosting Ultraviolet Freeze-in\nby Nicolás Bernal (Antonio N arino University) as part of CosmoConβ - Cosmology from Home\n\n\nAbstrac t\nWe present a novel UV freeze-in mechanism for enhancing the dark matter abundance in cosmologies where inflation is followed by an epoch dominate d by a fluid stiffer than radiation. In such scenarios\, even a small radi ation abundance\, produced for instance by instantaneous preheating effect s\, will eventually dominate the total energy density of the Universe with out the need for a complete inflaton decay. For the sake of concreteness\, we focus in non-oscillatory (NO) quintessential inflation models\, albeit our treatment is rather general and can be extended to other scenarios. T he high temperature of the initial thermal bath together with the absence of subsequent entropy injections into the Standard Model plasma translates into a highly-effective UV DM freeze-in. In particular\, we find that\, d uring kination\, an enhancement in the DM abundance is generically obtaine d for any production cross-section not-decreasing with temperature.\n\nVid eo of Talk: https:// www.youtube.com/watch?v=j0M36IY36E0\n\nRelevant Papers:
\n[2004.13706] Boosting Ultraviolet Freeze -in in NO Models\, by Nicolás Bernal\, Javier Rubio\, Hardi Veermäe< br>\n[1909.07992] Ultraviolet F reeze-in and Non-Standard Cosmologies\, by Nicolás Bernal\, Fatemeh E lahi\, Carlos Maldonado\, James Unwin
\n[1803.01866] Spin-2 Portal Dark Matter\, by Nicolas Bernal \, Maira Dutra\, Yann Mambrini\, Keith A. Olive\, Marco Peloso\, Mathias P ierre
\n LOCATION:https://stable.researchseminars.org/talk/CosmoConB/7/ END:VEVENT BEGIN:VEVENT SUMMARY:Chandrima Ganguly (University of Cambridge) DTSTART:20200503T220000Z DTEND:20200503T230000Z DTSTAMP:20260404T110743Z UID:CosmoConB/8 DESCRIPTION:Title: Mixmasters That Bounce\nby Chandrima Ganguly (University of C ambridge) as part of CosmoConβ - Cosmology from Home\n\n\nAbstract\nBounc ing cosmologies have been studied as alternatives to inflation. They face an isotropy problem as the anisotropies increase in the contracting phase. In this work\, we study isotropy in the most general anisotropic\, spatia lly homogeneous cosmology - called the Bianchi IX universe. We show that a quadratic equation of state which acts like a super-stiff fluid reminisce nt of Ekpyrosis at high energies is able to produce a bounce in this unive rse. We also introduce a novel isotropisation mechanism using a negative a nisotropic pressures that looks like shear viscosity and show that it isot ropises the Bianchi IX cosmology and also mitigates the chaotic Mixmaster behaviour that these models are known for.\n\nVideo of Talk: https://www.youtube.com/watch?v=e KXPpyUY_Ok\n\nRelevant Papers:
\n[1710.00747] Evolution of Cyclic Mixmaster Universes with Non-co moving Radiation\, by Chandrima Ganguly\, John D. Barrow
\n[1703.05969] Cyclic Mixmaster Universes \, by John D. Barrow\, Chandrima Ganguly
\n LOCATION:https://stable.researchseminars.org/talk/CosmoConB/8/ END:VEVENT BEGIN:VEVENT SUMMARY:José Luis Bernal (Johns Hopkins University) DTSTART:20200511T220000Z DTEND:20200511T230000Z DTSTAMP:20260404T110743Z UID:CosmoConB/9 DESCRIPTION:Title: Robustness of BAO Constraints to Beyond ΛCDM Cosmologies AND the Cosmic Expansion History from Line Intensity Mapping\nby José Luis B ernal (Johns Hopkins University) as part of CosmoConβ - Cosmology from Ho me\n\n\nAbstract\nBaryon acoustic oscillations (BAO) measurements are key to constrain cosmology at low redshift. While the standard BAO analysis is claimed to return model-independent constraints of the expansion history of the Universe\, it assumes a LCDM fiducial cosmology. This assumption ma y limit the validity and robustness of BAO measurements to constrain beyon d-LCDM cosmologies\, challenging their model-independent nature. We demons trate that standard BAO analysis assuming a fiducial LCDM cosmology is unb iased when using synthetic power spectra from extended cosmologies\, and f ind that the H0 tension cannot be solved by modifying only the neutrino ph ase shift. In addition\, we explore the potential of using the intensity m apping of molecular lines to extend BAO measurements to higher redshifts a nd the implications for the H0 tension.\n\nVideo of Talk: https://www.youtube.com/watch?v=WiTc AUXIUO4\n\nRelevant Papers:
\n[2004.07263] Robustness of baryon acoustic oscillations constraints to beyond-$Λ$CDM cosmologies\, by José Luis Bernal\, Tristan L. Smit h\, Kimberly K. Boddy\, Marc Kamionkowski
\n[1907.10065] The Cosmic Expansion History from Line-Intens ity Mapping\, by José Luis Bernal\, Patrick C. Breysse\, Ely D. Kovet z
\n LOCATION:https://stable.researchseminars.org/talk/CosmoConB/9/ END:VEVENT BEGIN:VEVENT SUMMARY:Yuanyuan Zhang (Fermilab) DTSTART:20200511T220000Z DTEND:20200511T230000Z DTSTAMP:20260404T110743Z UID:CosmoConB/10 DESCRIPTION:Title: Systematic Studies in Galaxy Cluster Cosmology\nby Yuanyuan Zhang (Fermilab) as part of CosmoConβ - Cosmology from Home\n\n\nAbstract \nConstraining LambdaCDM cosmology with galaxy cluster abundance is one of the fundamental goals of the Dark Energy Survey (DES). Many thousands of clusters out to redshift 0.65 have been identified in DES data. Weak lensi ng and multi-wavelength studies with X-ray data and cosmic microwave backg round are performed to provide inputs to the cosmology constraint analysis \, and studies about systematic effects are being conducted with simulatio n data. In this talk\, I will discuss current progress on DES galaxy clust er cosmology analyses and especially the current systematic effect limits. \n\nVideo of Talk: h ttps://www.youtube.com/watch?v=RdrFkrs84yY\n\nRelevant Papers:
\nDark Ene rgy Survey Year 1 results: weak lensing mass calibration of redMaPPer gala xy clusters\, by T. McClintock et al.
\nDark Energy Surveyed Year 1 results: calibration of cluster mis-centring in the redMaPPer catalogues\, by Y. Zhang et al.
\n Dark Energy Survey Year 1 results: validation of weak lensing cluster member contamination e stimates from P(z) decomposition\, by T. N. Varga et al.
\n LOCATION:https://stable.researchseminars.org/talk/CosmoConB/10/ END:VEVENT BEGIN:VEVENT SUMMARY:Steffen Hagstotz (Stockholm University) DTSTART:20200511T220000Z DTEND:20200511T230000Z DTSTAMP:20260404T110743Z UID:CosmoConB/11 DESCRIPTION:Title: Bounds on Light Sterile Neutrinos from Cosmology and Laboratory< /a>\nby Steffen Hagstotz (Stockholm University) as part of CosmoConβ - Co smology from Home\n\n\nAbstract\nI will present new constraints on sterile neutrino properties obtained from both cosmological and direct measuremen ts. For the first time\, we model the sterile in a full 3+1 framework coup led via oscillations to all other neutrino flavours and consistently calcu late the abundance and cosmological perturbations. CMB data dominates the resulting limits on mass splitting and the mixing matrix elements. In addi tion\, we translate the cosmological bounds to the mass parameters directl y probed by laboratory searches and obtain the strongest currently availab le limits. I will also show that various hints of eV-scale sterile neutrin os from short-baseline oscillation experiments are in severe tension with our cosmological constraints.\n\nVideo of Talk: https://www.youtube.com/watch?v=EDaNnS_QpvY\n\nPaper: [2003.02289] Bounds on light sterile neutrino mass and mixing from cosmology and laboratory s earches\, by Steffen Hagstotz\, Pablo F. de Salas\, Stefano Gariazzo\, Martina Gerbino\, Massimiliano Lattanzi\, Sunny Vagnozzi\, Katherine Free se\, Sergio Pastor
\n LOCATION:https://stable.researchseminars.org/talk/CosmoConB/11/ END:VEVENT BEGIN:VEVENT SUMMARY:Yuhsin Tsai (University of Maryland) DTSTART:20200504T220000Z DTEND:20200504T230000Z DTSTAMP:20260404T110743Z UID:CosmoConB/12 DESCRIPTION:Title: Determining the Neutrino Lifetime from Cosmology\nby Yuhsin Tsai (University of Maryland) as part of CosmoConβ - Cosmology from Home\ n\n\nAbstract\nIn the next decade\, improvements in the CMB and Large Scal e Structure (LSS) measurements will make the universe an excellent laborat ory for new physics in the neutrino sector. Besides knowing the sum of neu trino masses\, we can better answer questions about neutrino properties\, such as how long the SM neutrinos can live? In this talk\, I will explain the LSS signals of neutrino decay and show that the future tomographic sur vey of LSS can improve the lifetime bound on neutrinos to seven orders of magnitude\, from order 10 years to 10^8 years. If neutrinos decay on time scales less than O(100) million years\, the observations may allow\, not j ust the first measurement of the sum of neutrino masses\, but also the det ermination of the neutrino lifetime from cosmology.\n\nVideo of Talk: https://www.youtube.com/ watch?v=x9pMepDjdN8\n\nPaper: [2002.08401] Determining the Neutrino Lifetime from Cosmology\, by Zackaria Chacko\, Abhish Dev\, Peizhi Du\, Vivian Poulin\, Yuhsin Tsai\n LOCATION:https://stable.researchseminars.org/talk/CosmoConB/12/ END:VEVENT BEGIN:VEVENT SUMMARY:Robert Reischke (Technion - Israel Institute of Technology) DTSTART:20200511T220000Z DTEND:20200511T230000Z DTSTAMP:20260404T110743Z UID:CosmoConB/13 DESCRIPTION:Title: Axions Facing the Large-Scale Structure\nby Robert Reischke (Technion - Israel Institute of Technology) as part of CosmoConβ - Cosmol ogy from Home\n\n\nAbstract\nAxion-like particles (ALP) are an interesting Dark Matter (DM) candidate\, since their production mechanism\, motivated from particle physics\, is non-thermal. They can therefore assume very lo w masses while still producing the correct relic abundance. Due to their l ow mass they can leave observable imprints in the large-scale structure of the Universe which can be used to constrain the allowed ALP mass range. I n this talk I will briefly describe the production mechanism of ALPs in th e post-inflationary scenario and how they affect the large-scale distribut ion of matter. By confronting the theoretical predictions with CMB primary anisotropies\, CMB lensing and galaxy clusters\, the parameter space of A LPs\, especially its mass\, can be constrained. I will also highlight that the ALP model explored here fits a real feature present in the primary CM B\, which is\, however\, not supported by galaxy clusters.\n\nVideo of Tal k: https://www.youtube.com/watch?v=ieFmSWjIuLQ\n LOCATION:https://stable.researchseminars.org/talk/CosmoConB/13/ END:VEVENT BEGIN:VEVENT SUMMARY:Robert Lilow (Technion - Israel Institute of Technology) DTSTART:20200511T220000Z DTEND:20200511T230000Z DTSTAMP:20260404T110743Z UID:CosmoConB/14 DESCRIPTION:Title: Probing Structure Growth with Constrained Realizations of the Lo cal Universe\nby Robert Lilow (Technion - Israel Institute of Technolo gy) as part of CosmoConβ - Cosmology from Home\n\n\nAbstract\nThe distrib ution of structures in the local Universe and their flows provide a valuab le probe of cosmic structure formation. One way to access this information is to reconstruct the density and velocity fields of these structures\, u sing the distribution of observable galaxies. However\, since observations of a finite set of galaxies are contaminated by shot noise\, there is in fact an ensemble of possible reconstructions that are all compatible with the observations within the expected noise. In this talk\, I present a met hod to generate such an ensemble of so-called constrained realizations bas ed on the final release of the 2MASS Redshift Survey (2MRS)\, the densest all-sky redshift survey to date. This approach combines a noise-suppressin g minimum-variance estimator with a generator of random mock galaxy catalo gues. After explaining the method\, I show the resulting reconstructions a nd demonstrate how we can combine them with the Cosmicflows-3 catalogue of galaxy distances to constrain the cosmic growth rate as well as the motio n of the Local Group with respect to the CMB. I finish with an outlook on applying this method to the future all-sky spectral redshift survey SPHERE x.\n\nVideo of Talk: https://www.youtube.com/watch?v=eFCOAcHZzQY\n LOCATION:https://stable.researchseminars.org/talk/CosmoConB/14/ END:VEVENT BEGIN:VEVENT SUMMARY:Jose María Ezquiaga (University of Chicago) DTSTART:20200511T220000Z DTEND:20200511T230000Z DTSTAMP:20260404T110743Z UID:CosmoConB/15 DESCRIPTION:Title: Exploring the Exponential Tail of Inflationary Perturbations \nby Jose María Ezquiaga (University of Chicago) as part of CosmoConβ - Cosmology from Home\n\n\nAbstract\nTypically when we work with the primord ial spectrum of inflationary perturbations we approximate it as nearly Gau ssian due to the tight CMB constraints. However\, away from its maximum\, the distribution is poorly known. We develop a generic\, non-perturbative method to compute the tails of these distributions\, which we find to deca y exponentially thus being unavoidably non-Gaussian. Knowing the tails pre cisely is relevant for example for rare\, extreme objects such as primordi al black holes. Applying this new technique\, we find that potentials with an inflection point overproduce PBHs\, unless slow roll is violated.\n\nV ideo of Talk: https: //www.youtube.com/watch?v=dicQJ73FyE8\n\nPaper: [1912.05399] The exponential tail of inflationary flu ctuations: consequences for primordial black holes\, by Jose María Ez quiaga\, Juan García-Bellido\, Vincent Vennin
\n LOCATION:https://stable.researchseminars.org/talk/CosmoConB/15/ END:VEVENT BEGIN:VEVENT SUMMARY:Tommi Tenkanen (Johns Hopkins University) DTSTART:20200512T220000Z DTEND:20200512T230000Z DTSTAMP:20260404T110743Z UID:CosmoConB/16 DESCRIPTION:Title: Dark Matter from Scalar Field Fluctuations\nby Tommi Tenkane n (Johns Hopkins University) as part of CosmoConβ - Cosmology from Home\n \n\nAbstract\nThe observed dark matter (DM) abundance in the Universe can be fully accounted for by a minimally coupled spectator scalar field that was light during cosmic inflation. In this scenario\, dark matter was prod uced during inflation by amplification of quantum fluctuations of the spec tator field. I will discuss the DM isocurvature perturbations that are una voidably generated in such scenarios and the circumstances under which the y are not problematic for the viability of non-thermal DM models. I will a lso discuss implications of DM isocurvature for structure formation\, show ing that the scenario has interesting consequences which allow one to test models where DM is only gravitationally coupled. The talk is based on 1905.01214.\n\nRecorded Video\n LOCATION:https://stable.researchseminars.org/talk/CosmoConB/16/ END:VEVENT BEGIN:VEVENT SUMMARY:Soubhik Kumar (University of Maryland) DTSTART:20200512T220000Z DTEND:20200512T230000Z DTSTAMP:20260404T110743Z UID:CosmoConB/17 DESCRIPTION:Title: Cosmological Collider Physics and the Curvaton\nby Soubhik K umar (University of Maryland) as part of CosmoConβ - Cosmology from Home\ n\n\nAbstract\nIn this talk\, I will analyze primordial non-Gaussianity (N G) signatures of extremely heavy particles within a simple alternative to the standard inflationary paradigm\, namely the curvaton scenario\, where the primordial fluctuations and the inflationary spacetime expansion are s ourced by the curvaton and the inflaton fields\, respectively. I will desc ribe how this scenario can allow for orders of magnitude larger heavy-part icle mediated NG compared to those in standard inflation\, and also descri be a simple model in which particles with masses up to 50 times larger tha n Hubble scale can still lead to observable on-shell NG signals which woul d have been completely negligible in the standard scenario. This brings se veral well-motivated particle physics signatures within the reach of the C osmological Collider program which aims to do on-shell mass and spin spect roscopy of Hubble-scale particles during inflation.\n\nRecorded Video\n\nPaper: 1908.11378\n LOCATION:https://stable.researchseminars.org/talk/CosmoConB/17/ END:VEVENT END:VCALENDAR