Saxion decay ksvz axion model in general, decay into two axions is dominant but it is suppressed when we assume then the saxion decays into two gluons with decay rate dfsz axion model the saxion decays into higgses with decay rate a. The coherent enhancement mechanism allows one to reduce an inflation model with an arbitrary potential to an effective model of natural inflation, i. Max describes the inflation period as containing a nondiluting, inflating substance, where the energy used to inflate it causes its mass to increase through extreme negative pressure. In particle physics, supersymmetry susy is a conjectured relationship between two basic classes of elementary particles. Energy density remains same inflation over many inflation over many manymany cyclescycles 1. However, this is an ambiguous statement as we will now see, it is highly sensitive to the choice of basis, which should have no e ect on the physics. The mass and energy in our universe came from the decay of dark energy driving inflation. We study the corresponding inflationary evolution and we examine the. Supersymmetry is part of superstring theory, a string theory of quantum gravity, although it could in theory be a component of other quantum gravity theories as well, such as loop quantum gravity. Without loss of generality, take the decay constants g ito be given by g 1. Dark energy or massive neutrinos lead to potential decay. In this letter we discuss another interesting aspect of this model, related to gravitino production, with emphasis on the corresponding mass spectrum. Always the resulting decay rate of inflatons into bosons and fermions are mentioned without derivation in literature perhaps its assumed to be very simple.
Scaleinvariant cosmological perturbations from hoava. Masslessmassless scalar field will see inflation on an average, if scalar field will see inflation on an average, if. For superstring theory to be consistent, supersymmetry seems to be required at some level although it may be a strongly broken symmetry. Inflation and large scale structure horizon probleminflation. Preheating cosmological fluctuations theory of inflation. When a miniuniverse inflates and selfreproduces into, say, twenty causallydisconnected miniuniverses of. The higgs boson couples to gravity through a conformal factor that. A compelling possibility is the higgsinflation scenario 48,49, in which the sm higgs is responsible for inflation, thanks to a large nonminimal coupling to gravity. T h e in flation ary u n iverse stanford university. This allows inflation to continue forever, to produce futureeternal inflation. The claim, then, is that one can achieve a super planckian displacement from subplanckian decay constants. Supernatural inflation hybrid inflation sugra inflation susy fterm inflation susy dterm inflation susy pterm. Inflation generates gravity waves tensor fluctuations, with. Metric preheating and limitations of linearized gravity.
A type of spacetime symmetry, supersymmetry is a possible candidate for undiscovered particle physics, and seen by some physicists as an elegant solution to many current problems in. T h e inflationary universe scenario an d q u an tu m cosm ology 1 4. There are many inflationary models in string theory, including an interesting realization of the chaotic inflation scenario silverstein, westphal and mcallister, 0803. It is not a fundamental theory if we include supersymmetry in a theory of gravity. Decay of inflaton and preheating after inflation movie felder, lk. Sep 23, 2015 in this work, we will analyze \fr,\phi \inflation by working through some simple examples based on modified gravity models which mimic the false vacuum of the primordial universe. Inflation correspond to an epoch in which the comoving hubble radius decreases. The inflationary paradigm was first introduced in 1981 by guth and sato 6, 7 to explain the thermalization of the observable universe inferred from observations of the cmb.
In this case, a more complicated mass density spectrum. We investigate a super renormalizable and ghostfree theory of gravity, showing that under a natural exponential ansatz of the form factor and a suitable truncation it can give rise to the starobinsky inflationary theory in cosmological frameworks, and thus offering a theoretical justification of its origin. In this context it is usually called the true vacuum. A supercollider is being built in europe which may produce dark matter and. In this brief report we calculate the range of energy scales during nonsusy gut inflation such that n s and r are compatible with the planck 2015 constraints. This repulsive gravity drives the expansion of space restoring the true vacuum during the brief period of inflation which initiates the universe. The uv completion of more general f r gravity models can provide a unifying picture of dark matter, dark energy and inflation. Axion inflation and the lattice weak gravity conjecture tom rudelius ias. Field ranges but there is another interesting superplanckian issue if hm few107, the value of the in. If you mean the mass and distance are fixed, how the parameter g, gravitat. Enhancement of the axion decay constant in inflation and the. Particle physics has now moved into the super era, in which supersymmetry, supergravity, and superstring theories will be investigated by supercolliders. And gravity repulses this substance, accelerating its growth because the negative pressure causes negative gravity. The energy density is zero if t, so this condition corresponds to the ordinary vacuum of empty space.
On the equivalence between starobinsky and higgs inflationary. If bicep2 measured primordial gravity waves, the tensorscalar power ratio r. T h e oscillating inflationary universe an d gravitational confinem ent a p p en d ix 2. The same as the r2 inflation, the background trajectory of this model can provide sufficient inflationary efolds and a graceful exit to a radiation dominated phase. Enhancement of the axion decay constant in inflation and. Over the past years, interest in inflationary cosmology has grown considerably, as a consequence of the great amount of data from recent cosmological surveys 14. Metric preheating and limitations of linearized gravity bruce a. A compelling possibility is the higgsinflation scenario 48,49, in which the sm higgs is responsible for inflation, thanks to. Einstein gravity is not power counting renormalizable. Therefore, an observation of primordial gravitational waves with would indicate a scale of inflation of order the gut scale and the inflaton field range to be superplanckian. Inducedgravity gutscale higgs inflation in supergravity. Inflation in \fr,\phi \ theories and mimetic gravity. Following the inflationary period, the universe continued to expand, but at.
Gravity t 100,000 years matter perturbations grow into nonlinear structures. The state in which the scalar field is near 0, at the top of the plateau, is called the false vacuum. We investigate a superrenormalizable and ghostfree theory of gravity, showing that under a natural exponential ansatz of the form factor and a suitable truncation it can give rise to the starobinsky inflationary theory in cosmological frameworks, and thus offering a theoretical justification of its origin. After inflation, preheating is supposed as the mechanism which is responsible for restoring hot big bang. The claim, then, is that one can achieve a superplanckian displacement from subplanckian decay constants. This initial singularity is, however, not physical since general relativity fails for t. Inflation from a susy axion model masahiro kawasaki icrr, univ of tokyo. In some respects, a world without superstring theory isnt so bad. The bigbang model leads to three important, experimentally testable predictions. Whereas earlier treatments of postinflation reheating modeled the inflaton as a collection of independent. Research article helical phase inflation and monodromy in. These new features all stem from nonperturbative, nonequilibrium effects in the inflatons decay.
The weak gravity conjecture, if valid, rules out simple models of natural inflation by restricting their axion decay constant to be subplanckian. The super era of subatomic particle physics jay hauser abstract. Super symmetry breaking 1073 tonscm3 1028 gut transition 1 ps 1010 1060 1020 1. At planck scale, the quantum gravity e ect is likely to introduce extra terms which are suppressed by the planck mass and then irrelevant in the low energy scale, while for a superplanckian eld, the. Models of inducedgravity inflation are formulated within supergravity employing as inflaton the higgs field which leads to a spontaneous breaking of a u1bl symmetry at mgut2x1016 gev. As a simplified example, suppose that during inflation, the natural decay rate of the inflaton field is slow compared to the effect of quantum fluctuation. In any u 1 gauge theory that admits a uv completion with gravity, there must exist a state of charge q, mass m, such that q m q m extremal arkanihamed, motl, nicolis, vafa, 06. Axion inflation and the lattice weak gravity conjecture. There is a curious similarity between this conception of the mechanics of inflation and the notion of a rebound at the end of a cosmic life cycle or big crunch in a closed, cyclic universe. At planck scale, the quantum gravity e ect is likely to introduce extra terms which are suppressed by the planck mass and then irrelevant in the low energy scale, while for a super planckian eld, the.
In physical cosmology, cosmic inflation, cosmological inflation, or just inflation, is a theory of exponential expansion of space in the early universe. Primordial monopoles, proton decay, gravity waves and gut. R 2 supergravity lead to starobinskys potential, in a onefield setting for inflationary cosmology that appears favored by planck data. Starobinsky inflation and higgs inflation in gravity, and their equivalence based on the common inflationary potential are extended to supergravity in the proper framework, where the starobinsky. The m in the equation means the mass of the two objects and r represents the distance between the center of mass. We revisit stringy attempts to realise natural inflation, with a single open string axionic inflaton from dbranes in a warped throat. First, the model predicts that as the universe expands, galaxies recede from one another with a velocity proportional to the distance between them. The equation about universal gravity is as follows. Vagnozzi 0 1 3 4 0 nordita, kth royal institute of technology and stockholm university, roslagstullsbacken 23, 106 91 stockholm, sweden 1 niels bohr international academy and discovery center, niels bohr institute, university of copenhagen, blegdamsvej 17, 2100 copenhagen o. In the framework of gut inflation driven by a gauge singlet scalar field, one finds that for n s. Hubbleexit features in potential super hubble evolution selfinteractions+gravity local end of inflation tachyonic instability local preheating modulated preheating local after inflation curvaton decay local radiation + matter + lastscattering primary anisotropies local+equilateral. Always the resulting decay rate of inflatons into bosons and fermions are mentioned without derivation in.
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