If the electroweak sector of standard model is described by classically conformal dynamics, early Universe evolution can be substantially altered. It already known that-contrarily to case-a first-order phase transition may occur. Here we show that, depending on parameters, a dramatically different scenario happen: A first-order, six massless quark QCD occurs first, which then triggers symmetry breaking. We derive necessary conditions for this dynamics occur, using specific example B-L model....

We revisit the thermal leptogenesis scenario in type-I seesaw framework featuring three heavy Majorana neutrinos with a hierarchical mass spectrum. focus on low energy observables, specifically lightest neutrino $m_{\nu}^{\rm lightest}$ and neutrinoless double-beta decay effective parameter $m^{\rm eff}_{\beta\beta}$. In particular, we numerically calculate minimum of neutrino, $M_1^{\rm min}$, required for successful as function $m_{\beta\beta}^{\rm eff}$, considering both normal inverted...

Using the non-equilibrium Green function method (Kadanoff-Baym equations) in expanding universe, we investigate evolution of lepton number asymmetry when right-handed (RH) neutrinos have almost degenerate masses $$ |M_i^2-M_j^2| \ll M_i^2 . The resonantly enhanced CP-violating parameter ε i associated with decay RH neutrino N is obtained under an assumption that off-diagonal component Yukawa coupling smaller than diagonal one. It proportional to enhancement factor \left( {M_i^2-M_j^2}...

We revisit the small field Coleman-Weinberg (CW) inflation, which has following two problems. First, smallness of slow roll parameter $\epsilon$ requires inflation scale to be very low. Second, spectral index $n_s \approx1+2 \eta$ tends become smaller compared observed value. In this letter, we consider possible effects on dynamics inflation: radiatively generated non-minimal coupling gravity $\xi \phi^2 {\cal R}$ and condensation fermions coupled inflaton as $\phi \bar\psi \psi$. show that...

Scale invariance supplemented by the requirement of absence new heavy particles may play an important role in addressing hierarchy problem. We discuss how Standard Model become scale invariant at quantum level above a certain value Higgs field without addition degrees freedom and analyze phenomenological cosmological consequences this setup, particular, possible metastability electroweak vacuum inflation.

Entanglement generation by Newtonian gravitational potential between objects has been widely discussed to reveal the quantum nature of gravity. In this paper, we perform a field theoretical analysis slightly modified version gedanken experiment Mari and co-workers [A. et al., Sci. Rep. 6, 22777 (2016).]. We show that decoherence due presence detector propagates with speed light in terms retarded Green's function, as it should be consistent causality relativistic theories. The fields, such...

Solving the Kadanoff-Baym (KB) equations in a different method from our previous analysis, we obtain CP violating parameter ε thermal resonant leptogenesis without assuming smallness of off-diagonal Yukawa couplings. For that purpose, first derive kinetic equation for density matrix RH neutrinos with almost degenerate masses M i (i = 1, 2) ~ M. If deviation equilibrium is small, differential reduced to linear algebraic and can be solved explicitly terms time variation (local) distribution...

Motivated by the Bose et al.-Matletto-Vedral (BMV) proposal for detecting quantum superposition of spacetime geometries, we study a toy model entanglement generation between two spins (qubits) mediated relativistic free scalar field. After time evolution, spin correlation is generated through interactions with Because associated particle creation into an open system, state partially decohered. In this paper, give comprehensive based on closed path formalism, focusing causality and mechanical...

We construct a bulk spacetime from boundary conformal field theory, <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>O</a:mi><a:mo stretchy="false">(</a:mo><a:mi>N</a:mi><a:mo stretchy="false">)</a:mo></a:math> free scalar model, at finite temperature using smearing technique, called flow. The metric is constructed the thermal two-point function of smeared elementary in such way that it can be interpreted as an information associated with thermofield double state....

Small-field inflation (SFI) is widely considered to be unnatural because an extreme fine-tuning of the initial condition necessary for sufficiently large $e$-folding. In this paper, we show that unnaturally looking can dynamically realized without any if SFI occurs after rapid oscillations inflaton field and particle creations by preheating. fact, $\ensuremath{\phi}$ coupled another scalar $\ensuremath{\chi}$ through interaction ${g}^{2}{\ensuremath{\chi}}^{2}{\ensuremath{\phi}}^{2}$ vacuum...

We investigate a structure of 4-dimensional bulk space constructed from the $O(N)$ invariant critical $\varphi^4$ model in 3-dimension using conformal smearing. calculate metric corresponding to information and bulk-to-boundary propagator for composite scalar field $\varphi^2$ large $N$ expansion. show that describes an asymptotic AdS at both UV (near boundary) IR (deep bulk) limits, which correspond free fixed point Wilson-Fischer 3-dimensional model, respectively. The propagator, on other...

A bstract We investigate a structure of 4-dimensional bulk space constructed from the O ( N ) invariant critical φ 4 model in 3-dimension using conformal smearing. calculate metric corresponding to information and bulk-to-boundary propagator for composite scalar field 2 large expansion. show that describes an asymptotic AdS at both UV (near boundary) IR (deep bulk) limits, which correspond free fixed point Wilson-Fisher 3-dimensional model, respectively. The propagator, on other hand,...

We derive the GKP-Witten relation in terms of correlation functions by symmetry without referring to a Lagrangian or large $N$ expansion. By constructing bulk operators from boundary conformal field theory (CFT) smearing, we first determine bulk-boundary 2-pt for an arbitrary spin using both and symmetries, then evaluate their small $z$ behaviors, where is $(d+1)$-th coordinate bulk. Next, explicitly behaviors bulk-boundary-boundary 3-pt also while among one $n$ with $n\ge 3$ are fixed...

``Axion-CMB scenario'' is an interesting possibility to explain the temperature anisotropy of cosmic microwave background (CMB) by primordial fluctuations QCD axion [S. Iso, K. Kawana, and Shimada, Phys. Rev. D 102, 103513 (2020)]. In this scenario, radiations are generated energy exchange between axions radiations, which results in correlation CMB anisotropies. Consequently, cosmological observations stringently constrain a model early history universe. particular, we need large fraction...

In this paper, we consider a possibility that the temperature anisotropy of cosmic microwave background (CMB) is dominantly generated by primordial fluctuations QCD-axion like particles under circumstance inflaton's perturbation too small to explain CMB anisotropy. Since axion potential acquiring its energy from radiation, field in inflation era are correlated with anisotropies. Consequently, observations stringently constrain model and early universe scenario. The following conditions must...

We give a modified derivation of the Einstein equation state by considering Clausius relation $T\delta S-\delta N =\delta Q$ on null hypersurface with non-vanishing expansion ($\theta \neq 0$), i.e. not in equilibrium. The corresponds to choosing specific observer hypersurface, and such generalization gives hint how we can improve original Jacobson. also an interpretation thermodynamic based Noether charge method.

We provide an improved definition of new conserved quantities derived from the energy-momentum tensor in curved spacetime by introducing additional scalar function. find that current and associated charge become geometric under a certain initial condition function, show such generally exists spacetime. Furthermore, we demonstrate agrees with entropy for perfect fluid, thus is total system. While can be regarded as non-dissipative its physical meaning should investigated more general cases.

We construct a bulk spacetime from boundary CFT, $O(N)$ free scalar model, at finite temperature using smearing technique, called conformal flow. The metric is constructed as an information associated with the thermal state. Near (UV region), asymptotically AdS obtained leading order perturbation of mode. Based on falloff behavior perturbations and symmetry in we argue that corresponding theory modified gravity mode such $f(R)$ rather than Einstein's general relativity coupled minimally to...

Entanglement generation by Newtonian gravitational potential between objects has been widely discussed to reveal the quantum nature of gravity. In this paper, we perform a field theoretical analysis slightly modified version gedanken experiment Mari and co-workers. We show that decoherence due presence detector propagates with speed light in terms retarded Green's function, as it should be consistent causality relativistic theories. The fields, such fluctuations or emission gravitons...

Motivated by the Bose et al.-Matletto-Vedral (BMV) proposal for detecting quantum superposition of spacetime geometries, we study a toy model entanglement generation between two spins (qubits) mediated relativistic free scalar field. After time evolution, spin correlation is generated through interactions with Because associated particle creation into an open system, state partially decohered. In this paper, give comprehensive based on closed-time path formalism, focussing causality and...